Deposit balances reflect growth of $72.6 million, or 3%, during the first six months of 2023. Core non-maturity deposits decreased by $135.2 million, or 6%, while customer time deposits increased by $152.8 million, or 38%. Wholesale brokered deposits increased by $55.0 million. Overall noninterest-bearing deposits as a percent of total deposits at June 30, 2023, decreased to 36.5%, as compared to 38.2% at December 31, 2022 and 39.3% at June 30, 2022. Other interest-bearing liabilities of $483.8 million on June 30, 2023, consisted of $245.2 million in overnight borrowings, $80.0 million in term FHLB advances, $73.7 million in customer repurchase agreements, $35.6 million in trust preferred securities and $49.3 million in subordinated debentures.
Overall uninsured deposits are estimated to be approximately $799.7 million, or 27% of total deposit balances, excluding public agency deposits that are subject to collateralization through a letter of credit issued by the FHLB. In addition, uninsured deposits of the bank’s customers are eligible for FDIC pass-through insurance if the customer opens an IntraFi Insured Cash Sweep (ICS) account or a reciprocal time deposit through the Certificate of Deposit Account Registry System (CDARS). IntraFi allows for up to $225 million per customer of pass-through FDIC insurance which would more than cover each of the Bank’s deposit customers if such customer desired to have such pass-through insurance. The Bank maintains a diversified deposit base with no significant customer concentrations and does not bank any cryptocurrency companies. At June 30, 2023, the Company had approximately 121,000 accounts and the 25 largest deposit balance customers had balances of approximately 11% of overall deposits. During the second quarter of 2023, except for seasonality fluctuations in the normal course of business, there has been no change in the composition of our 25 largest deposit balance customers.
The Company continues to have substantial liquidity which is managed daily. At June 30, 2023, and December 31, 2022, the Company had the following sources of primary and secondary liquidity (Dollars in Thousands):
| | | | | | |
Primary and secondary liquidity sources | | | June 30, 2023 | | | December 31, 2022 |
Cash and cash equivalents | | $ | 103,483 | | $ | 77,131 |
Unpledged investment securities | | | 872,991 | | | 1,097,164 |
Excess pledged securities | | | 359,510 | | | 43,096 |
FHLB borrowing availability | | | 656,318 | | | 718,842 |
Unsecured lines of credit | | | 339,785 | | | 237,000 |
Funds available through fed discount window | | | 256,846 | | | 42,278 |
Totals | | $ | 2,588,933 | | $ | 2,215,511 |
Total capital of $309.6 million at June 30, 2023, reflects an increase of $6.0 million, or 2%, relative to year-end 2022. The increase in equity during the first half of 2023 was due to the addition of $18.7 million in net income, a $0.07 million favorable swing in accumulated other comprehensive income/loss due principally to changes in investment securities’ fair value, $3.8 million in share repurchases and net of $7.0 million in dividends paid. The remaining difference is related to stock options exercised and restricted stock compensation recognized during the quarter.
Asset Quality
Total nonperforming assets, comprised of nonaccrual loans and foreclosed assets, decreased by $18.4 million to $1.1 million for the first half of 2023. The Company's ratio of nonperforming loans to gross loans decreased to 0.05% at June 30, 2023 from 0.95% at December 31, 2022. The decrease resulted from a decrease in non-accrual loan balances, primarily as a result of the foreclosure and sale of one loan relationship in the dairy industry consisting of four separate loans in the first quarter of 2023. All the Company's nonperforming assets are individually evaluated for credit loss quarterly and management believes the established allowance for credit loss on such loans is appropriate.
The Company's allowance for credit losses on loans and leases was $23.0 million at June 30, 2023, as compared to $23.1 million at December 31, 2022. The relatively flat allowance for credit losses on loans and leases was due to fewer net charge offs during the first half of 2023 along with relatively low loan growth.