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Securities (Tables) | 3 Months Ended
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Mar. 31, 2026
Investments, Debt and Equity Securities [Abstract] |
Schedule of Amortized Cost and Fair Value of Securities Available for Sale | The amortized cost and fair value of securities available for sale were as follows as of the dates presented in the tables below. There was no allowance for credit losses allocated to any of the Company’s available for sale securities as of March 31, 2026 or December 31, 2025.
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  |  |  | Fair Value
March 31, 2026 |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 272,729 |  |  | $ | 5,493 |  |  | $ | (3,580) |  |  |  |  | $ | 274,642 |
Residential mortgage-backed securities: |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 1,045,352 |  |  | 2,144 |  |  | (18,395) |  |  |  |  | 1,029,101 |
Collateralized mortgage obligations | 727,087 |  |  | 3,565 |  |  | (62,584) |  |  |  |  | 668,068 |
Commercial mortgage-backed securities: |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 99,305 |  |  | 203 |  |  | (461) |  |  |  |  | 99,047 |
Collateralized mortgage obligations | 419,035 |  |  | 2,985 |  |  | (18,798) |  |  |  |  | 403,222 |
Other debt securities | 336,708 |  |  | 1,145 |  |  | (2,286) |  |  |  |  | 335,567 |
| $ | 2,900,216 |  |  | $ | 15,535 |  |  | $ | (106,104) |  |  |  |  | $ | 2,809,647 |
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  |  |  |  |  | Fair Value
December 31, 2025 |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 266,553 |  |  | $ | 8,012 |  |  | $ | (1,780) |  |  |  |  |  |  | $ | 272,785 |
Residential mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 793,154 |  |  | 5,670 |  |  | (15,675) |  |  |  |  |  |  | 783,149 |
Collateralized mortgage obligations | 706,986 |  |  | 2,826 |  |  | (57,908) |  |  |  |  |  |  | 651,904 |
Commercial mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 100,314 |  |  | 285 |  |  | (762) |  |  |  |  |  |  | 99,837 |
Collateralized mortgage obligations | 419,356 |  |  | 3,552 |  |  | (18,120) |  |  |  |  |  |  | 404,788 |
Other debt securities | 349,132 |  |  | 1,537 |  |  | (2,314) |  |  |  |  |  |  | 348,355 |
| $ | 2,635,495 |  |  | $ | 21,882 |  |  | $ | (96,559) |  |  |  |  |  |  | $ | 2,560,818 |
The amortized cost and fair value of securities held to maturity were as follows as of the dates presented:
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  |  |  |  |  | Fair Value
March 31, 2026 |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 278,510 |  |  | $ | 9 |  |  | $ | (31,584) |  |  |  |  |  |  | $ | 246,935 |
Residential mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 313,373 |  |  | — |  |  | (12,441) |  |  |  |  |  |  | 300,932 |
Collateralized mortgage obligations | 312,961 |  |  | — |  |  | (23,348) |  |  |  |  |  |  | 289,613 |
Commercial mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 16,901 |  |  | — |  |  | (2,079) |  |  |  |  |  |  | 14,822 |
Collateralized mortgage obligations | 41,851 |  |  | — |  |  | (6,004) |  |  |  |  |  |  | 35,847 |
Other debt securities | 42,947 |  |  | — |  |  | (2,400) |  |  |  |  |  |  | 40,547 |
| $ | 1,006,543 |  |  | $ | 9 |  |  | $ | (77,856) |  |  |  |  |  |  | $ | 928,696 |
Allowance for credit losses - held to maturity securities | (32) |  |  |  |  |  |  |  |  |  |  |
Held-to-maturity securities, net of allowance for credit losses | $ | 1,006,511 |  |  |  |  |  |  |  |  |  |  |
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  |  |  |  |  | Fair Value
December 31, 2025 |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 279,424 |  |  | $ | 29 |  |  | $ | (29,516) |  |  |  |  |  |  | $ | 249,937 |
Residential mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 323,993 |  |  | — |  |  | (10,030) |  |  |  |  |  |  | 313,963 |
Collateralized mortgage obligations | 320,258 |  |  | — |  |  | (18,600) |  |  |  |  |  |  | 301,658 |
Commercial mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 16,938 |  |  | — |  |  | (2,059) |  |  |  |  |  |  | 14,879 |
Collateralized mortgage obligations | 42,079 |  |  | — |  |  | (5,997) |  |  |  |  |  |  | 36,082 |
Other debt securities | 47,413 |  |  | — |  |  | (2,062) |  |  |  |  |  |  | 45,351 |
| $ | 1,030,105 |  |  | $ | 29 |  |  | $ | (68,264) |  |  |  |  |  |  | $ | 961,870 |
Allowance for credit losses - held to maturity securities | (32) |  |  |  |  |  |  |  |  |  |  |
Held-to-maturity securities, net of allowance for credit losses | $ | 1,030,073 |  |  |  |  |  |  |  |  |  |  |
Schedule of Amortized Cost and Fair Value of Securities by Contractual Maturity | The amortized cost and fair value of securities at March 31, 2026 by contractual maturity are shown below. Expected maturities will differ from contractual maturities because issuers may call or prepay obligations with or without call or prepayment penalties.
| Held to Maturity |  | Available for Sale
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Due within one year | $ | 230 |  |  | $ | 230 |  |  | $ | 7,235 |  |  | $ | 7,247 |
Due after one year through five years | 12,007 |  |  | 11,528 |  |  | 73,896 |  |  | 74,540 |
Due after five years through ten years | 186,144 |  |  | 166,048 |  |  | 123,963 |  |  | 123,220 |
Due after ten years | 80,129 |  |  | 69,129 |  |  | 117,477 |  |  | 119,256 |
Residential mortgage-backed securities: |  |  |  |  |  |  |
Agency mortgage-backed securities | 313,373 |  |  | 300,932 |  |  | 1,045,352 |  |  | 1,029,101 |
Collateralized mortgage obligations | 312,961 |  |  | 289,613 |  |  | 727,087 |  |  | 668,068 |
Commercial mortgage-backed securities: |  |  |  |  |  |  |
Agency mortgage-backed securities | 16,901 |  |  | 14,822 |  |  | 99,305 |  |  | 99,047 |
Collateralized mortgage obligations | 41,851 |  |  | 35,847 |  |  | 419,035 |  |  | 403,222 |
Other debt securities | 42,947 |  |  | 40,547 |  |  | 286,866 |  |  | 285,946 |
| $ | 1,006,543 |  |  | $ | 928,696 |  |  | $ | 2,900,216 |  |  | $ | 2,809,647 |
Schedule of Gross Unrealized Losses and Fair Value of Available-for-Sale Securities | The following tables present the age of gross unrealized losses and fair value by investment category for which an allowance for credit losses has not been recorded as of the dates presented:
| Less than 12 Months |  | 12 Months or More |  | Total
| # |  | Fair Value |  | Unrealized Losses |  | # |  | Fair Value |  | Unrealized Losses |  | # |  | Fair Value |  | Unrealized Losses
Available for Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
March 31, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | 41 |  |  | $ | 61,680 |  |  | $ | (1,575) |  |  | 11 |  | $ | 15,793 |  |  | $ | (2,005) |  |  | 52 |  | $ | 77,473 |  |  | $ | (3,580) |
Residential mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 18 |  |  | 408,243 |  |  | (2,236) |  |  | 38 |  | 192,999 |  |  | (16,159) |  |  | 56 |  | 601,242 |  |  | (18,395) |
Collateralized mortgage obligations | 2 |  |  | 73,544 |  |  | (333) |  |  | 38 |  | 287,019 |  |  | (62,251) |  |  | 40 |  | 360,563 |  |  | (62,584) |
Commercial mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 8 |  | 46,283 |  |  | (180) |  |  | 1 |  | 4,680 |  |  | (281) |  |  | 9 |  | 50,963 |  |  | (461) |
Collateralized mortgage obligations | 24 |  | 107,519 |  |  | (635) |  |  | 26 |  | 102,716 |  |  | (18,163) |  |  | 50 |  | 210,235 |  |  | (18,798) |
Other debt securities | 12 |  |  | 150,891 |  |  | (293) |  |  | 10 |  | 68,947 |  |  | (1,993) |  |  | 22 |  | 219,838 |  |  | (2,286) |
Total | 105 |  | $ | 848,160 |  |  | $ | (5,252) |  |  | 124 |  | $ | 672,154 |  |  | $ | (100,852) |  |  | 229 |  | $ | 1,520,314 |  |  | $ | (106,104) |
December 31, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | 13 |  | $ | 19,454 |  |  | $ | (445) |  |  | 7 |  | $ | 13,591 |  |  | $ | (1,335) |  |  | 20 |  | $ | 33,045 |  |  | $ | (1,780) |
Residential mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 8 |  | 135,320 |  |  | (903) |  |  | 36 |  | 132,975 |  |  | (14,772) |  |  | 44 |  | 268,295 |  |  | (15,675) |
Collateralized mortgage obligations | 2 |  |  | 24,816 |  |  | (58) |  |  | 37 |  | 299,606 |  |  | (57,850) |  |  | 39 |  | 324,422 |  |  | (57,908) |
Commercial mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 9 |  |  | 71,188 |  |  | (395) |  |  | 2 |  | 5,595 |  |  | (367) |  |  | 11 |  | 76,783 |  |  | (762) |
Collateralized mortgage obligations | 12 |  |  | 40,387 |  |  | (56) |  |  | 25 |  | 102,206 |  |  | (18,064) |  |  | 37 |  | 142,593 |  |  | (18,120) |
Other debt securities | 10 |  | 191,504 |  |  | (1,347) |  |  | 8 |  | 14,571 |  |  | (967) |  |  | 18 |  | 206,075 |  |  | (2,314) |
Total | 54 |  | $ | 482,669 |  |  | $ | (3,204) |  |  | 115 |  | $ | 568,544 |  |  | $ | (93,355) |  |  | 169 |  | $ | 1,051,213 |  |  | $ | (96,559) |
Schedule of Gross Unrealized Losses and Fair Value of Held-to-Maturity Securities |
| Less than 12 Months |  | 12 Months or More |  | Total
| # |  | Fair Value |  | Unrealized Losses |  | # |  | Fair Value |  | Unrealized Losses |  | # |  | Fair Value |  | Unrealized Losses
Held to Maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
March 31, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | 7 |  | $ | 17,311 |  |  | $ | (1,296) |  |  | 117 |  | $ | 227,737 |  |  | $ | (30,288) |  |  | 124 |  | $ | 245,048 |  |  | $ | (31,584) |
Residential mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | 4 |  | 44,100 |  |  | (728) |  |  | 62 |  | 256,832 |  |  | (11,713) |  |  | 66 |  | 300,932 |  |  | (12,441) |
Collateralized mortgage obligations | — |  | — |  |  | — |  |  | 18 |  | 289,613 |  |  | (23,348) |  |  | 18 |  | 289,613 |  |  | (23,348) |
Commercial mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | — |  | — |  |  | — |  |  | 1 |  | 14,823 |  |  | (2,079) |  |  | 1 |  | 14,823 |  |  | (2,079) |
Collateralized mortgage obligations | — |  | — |  |  | — |  |  | 9 |  | 35,847 |  |  | (6,004) |  |  | 9 |  | 35,847 |  |  | (6,004) |
Other debt securities | — |  | — |  |  | — |  |  | 10 |  | 40,547 |  |  | (2,400) |  |  | 10 |  | 40,547 |  |  | (2,400) |
Total | 11 |  | $ | 61,411 |  |  | $ | (2,024) |  |  | 217 |  | $ | 865,399 |  |  | $ | (75,832) |  |  | 228 |  | $ | 926,810 |  |  | $ | (77,856) |
December 31, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | — |  | $ | — |  |  | $ | — |  |  | 124 |  | $ | 248,044 |  |  | $ | (29,516) |  |  | 124 |  | $ | 248,044 |  |  | $ | (29,516) |
Residential mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | — |  | — |  |  | — |  |  | 66 |  | 313,963 |  |  | (10,030) |  |  | 66 |  | 313,963 |  |  | (10,030) |
Collateralized mortgage obligations | — |  | — |  |  | — |  |  | 18 |  | 301,657 |  |  | (18,600) |  |  | 18 |  | 301,657 |  |  | (18,600) |
Commercial mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities | — |  | — |  |  | — |  |  | 1 |  | 14,879 |  |  | (2,059) |  |  | 1 |  | 14,879 |  |  | (2,059) |
Collateralized mortgage obligations | — |  | — |  |  | — |  |  | 9 |  | 36,083 |  |  | (5,997) |  |  | 9 |  | 36,083 |  |  | (5,997) |
Other debt securities | — |  | — |  |  | — |  |  | 10 |  | 45,351 |  |  | (2,062) |  |  | 10 |  | 45,351 |  |  | (2,062) |
Total | — |  | $ | — |  |  | $ | — |  |  | 228 |  | $ | 959,977 |  |  | $ | (68,264) |  |  | 228 |  | $ | 959,977 |  |  | $ | (68,264) |

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