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Investment Securities | 9 Months Ended
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Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract] |
Investment Securities | Note 3 -- Investment Securities The amortized cost, gross unrealized gains and losses and estimated fair values for available-for-sale and held-to-maturity securities by major security type at September 30, 2023 and December 31, 2022 were as follows (in thousands):
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Fair Value |
September 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  | $ | 245,648 |  |  | $ | — |  |  | $ | (33,719 | ) |  | $ | 211,929 |
Obligations of states and political subdivisions |  |  | 341,002 |  |  |  | 28 |  |  |  | (74,557 | ) |  |  | 266,473 |
Mortgage-backed securities: GSE residential |  |  | 810,113 |  |  |  | 2,036 |  |  |  | (139,627 | ) |  |  | 672,522 |
Other securities |  |  | 73,806 |  |  |  | — |  |  |  | (6,135 | ) |  |  | 67,671 |
Total available-for-sale |  | $ | 1,470,569 |  |  | $ | 2,064 |  |  | $ | (254,038 | ) |  | $ | 1,218,595 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |
Other investments |  | $ | 2,259 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,259 |
Total held-to-maturity |  | $ | 2,259 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,259 |
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  | $ | 252,934 |  |  | $ | — |  |  | $ | (32,407 | ) |  | $ | 220,527 |
Obligations of states and political subdivisions |  |  | 347,409 |  |  |  | 134 |  |  |  | (59,845 | ) |  |  | 287,698 |
Mortgage-backed securities: GSE residential |  |  | 744,636 |  |  |  | 3 |  |  |  | (116,759 | ) |  |  | 627,880 |
Other securities |  |  | 87,393 |  |  |  | 6 |  |  |  | (4,519 | ) |  |  | 82,880 |
Total available-for-sale |  | $ | 1,432,372 |  |  | $ | 143 |  |  | $ | (213,530 | ) |  | $ | 1,218,985 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |
Other investments |  | $ | 2,954 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,954 |
Total held-to-maturity |  | $ | 2,954 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,954 |
The Company also had $3,932,000 and $311,000 of equity securities, at fair value, as of September 30, 2023 and December 31, 2022, respectively. The Company's held-to-maturity securities are annuities for which the risk of loss is minimal. As such, as of September 30, 2023, the Company did not record an allowance for credit losses on its held-to-maturity securities. Realized gains and losses resulting from sales of securities were as follows during the three and nine months ended September 30, 2023 and 2022 (in thousands):
|  | Three months |  |  | Nine months |
|  | September 30, |  |  | September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Gross gains |  | $ | 3,823 |  |  | $ | 191 |  |  | $ | 3,829 |  |  | $ | 193 |
Gross losses |  |  | (434 | ) |  |  | (112 | ) |  |  | (492 | ) |  |  | (112 | )
The following table indicates the expected maturities of investment securities classified as available-for-sale presented at fair value, and held-to-maturity presented at amortized cost, at September 30, 2023 and the weighted average yield for each range of maturities (dollars in thousands):
|  | One year or less |  |  | After 1 through 5 years |  |  | After 5 through 10 years |  |  | After ten years |  |  | Total |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  | $ | 170,295 |  |  | $ | 39,997 |  |  | $ | 1,637 |  |  | $ | — |  |  | $ | 211,929 |
Obligations of state and political subdivisions |  |  | 20,023 |  |  |  | 82,929 |  |  |  | 162,387 |  |  |  | 1,134 |  |  |  | 266,473 |
Mortgage-backed securities: GSE residential |  |  | 1,690 |  |  |  | 19,588 |  |  |  | 39,452 |  |  |  | 611,792 |  |  |  | 672,522 |
Other securities |  |  | 18,929 |  |  |  | 48,121 |  |  |  | 621 |  |  |  | — |  |  |  | 67,671 |
Total available-for-sale investments |  | $ | 210,937 |  |  | $ | 190,635 |  |  | $ | 204,097 |  |  | $ | 612,926 |  |  | $ | 1,218,595 |
Weighted average yield |  |  | 1.64 | % |  |  | 2.57 | % |  |  | 2.03 | % |  |  | 1.70 | % |  |  | 1.88 | %
Full tax-equivalent yield |  |  | 1.64 | % |  |  | 2.58 | % |  |  | 2.06 | % |  |  | 1.72 | % |  |  | 1.90 | %
Held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other investments |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 2,259 |  |  | $ | 2,259 |
Total held-to-maturity |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 2,259 |  |  | $ | 2,259 |
Weighted average yield |  |  | — | % |  |  | — | % |  |  | — | % |  |  | — | % |  |  | — | %
Full tax-equivalent yield |  |  | — | % |  |  | — | % |  |  | — | % |  |  | — | % |  |  | — | %
The weighted average yields are calculated based on the amortized cost and effective yields weighted for the scheduled maturity of each security. Tax-equivalent yields have been calculated using a 21% tax rate. With the exception of obligations of the U.S. Treasury and other U.S. government agencies and corporations, there were no investment securities of any single issuer, the book value of which exceeded 10% of stockholders' equity at September 30, 2023. Investment securities carried at approximately $860 million and $770 million at September 30, 2023 and December 31, 2022, respectively, were pledged to secure public deposits and repurchase agreements and for other purposes as permitted or required by law. The following table presents the aging of gross unrealized losses and fair value by investment category as of September 30, 2023 and December 31, 2022 (in thousands):
|  | Less than 12 months |  |  | 12 months or more |  |  | Total |
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
September 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  | $ | 3,204 |  |  | $ | (38 | ) |  | $ | 208,428 |  |  | $ | (33,681 | ) |  | $ | 211,632 |  |  | $ | (33,719 | )
Obligations of states and political subdivisions |  |  | 41,664 |  |  |  | (2,467 | ) |  |  | 219,250 |  |  |  | (72,090 | ) |  |  | 260,914 |  |  |  | (74,557 | )
Mortgage-backed securities: GSE residential |  |  | 16,495 |  |  |  | (278 | ) |  |  | 555,338 |  |  |  | (139,349 | ) |  |  | 571,833 |  |  |  | (139,627 | )
Other securities |  |  | 5,280 |  |  |  | (470 | ) |  |  | 56,641 |  |  |  | (5,665 | ) |  |  | 61,921 |  |  |  | (6,135 | )
Total |  | $ | 66,643 |  |  | $ | (3,253 | ) |  | $ | 1,039,657 |  |  | $ | (250,785 | ) |  | $ | 1,106,300 |  |  | $ | (254,038 | )
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  | $ | 57,007 |  |  | $ | (3,493 | ) |  | $ | 163,520 |  |  | $ | (28,914 | ) |  | $ | 220,527 |  |  | $ | (32,407 | )
Obligations of states and political subdivisions |  |  | 220,102 |  |  |  | (43,221 | ) |  |  | 45,419 |  |  |  | (16,624 | ) |  |  | 265,521 |  |  |  | (59,845 | )
Mortgage-backed securities: GSE residential |  |  | 165,966 |  |  |  | (19,859 | ) |  |  | 461,446 |  |  |  | (96,900 | ) |  |  | 627,412 |  |  |  | (116,759 | )
Other securities |  |  | 64,676 |  |  |  | (3,675 | ) |  |  | 6,698 |  |  |  | (844 | ) |  |  | 71,374 |  |  |  | (4,519 | )
Total |  | $ | 507,751 |  |  | $ | (70,248 | ) |  | $ | 677,083 |  |  | $ | (143,282 | ) |  | $ | 1,184,834 |  |  | $ | (213,530 | )
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies. At September 30, 2023 there were forty available-for-sale securities with a fair value of $208.4 million and unrealized losses of $33.7 million in a continuous unrealized loss position for twelve months or more. At December 31, 2022, there were sixteen available-for-sale securities with a fair value of $163.5 million and unrealized losses of $28.9 million in a continuous unrealized loss position for twelve months or more. There were no held-to-maturity U.S. Treasury securities and obligations of U.S. government corporations and agencies in a continuous unrealized loss position for twelve months or more. Obligations of states and political subdivisions. At September 30, 2023, there were two hundred thirty-five obligations of states and political subdivisions with a fair value of $219.3 million and unrealized losses of $72.1 million in a continuous unrealized loss position for twelve months or more. At December 31, 2022 there were thirty-six obligations of states and political subdivisions with a fair value of $45.4 million and unrealized losses of $16.6 million in a continuous unrealized loss position for twelve months or more. Mortgage-backed Securities: GSE Residential. At September 30, 2023, there were two hundred seventy-eight mortgage-backed securities with a fair value of $555.3 million and unrealized losses of $139.3 million in a continuous unrealized loss position for twelve months or more. At December 31, 2022, there were ninety-one mortgage-backed securities with a fair value of $461.4 million and unrealized losses of $96.9 million in a continuous unrealized loss position for twelve months or more. Other securities. At September 30, 2023, there were forty-three other securities with a fair value of $56.6 million and unrealized losses of $5.7 million in a continuous unrealized loss position for twelve months or more. At December 31, 2022, there were five other securities with a fair value of $6.7 million and unrealized losses of $0.8 million in a continuous unrealized loss position for twelve months or more.

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