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Investments (Tables) | 12 Months Ended
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Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation | The following tables present the amortized cost, gross unrealized gains and losses, ACL and fair value of securities available-for-sale and held-to-maturity as of the periods indicated:
| December 31, 2025
($ in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-sale securities: |  |  |  |  |  |  |
Obligations of U.S. Government-sponsored enterprises | $ | 187,587 |  |  | $ | 76 |  |  | $ | (5,091) |  |  | $ | 182,572 |
Obligations of states and political subdivisions | 626,900 |  |  | 3,914 |  |  | (58,109) |  |  | 572,705 |
Agency mortgage-backed securities | 1,733,003 |  |  | 12,638 |  |  | (36,330) |  |  | 1,709,311 |
U.S. Treasury Bills | 171,355 |  |  | 128 |  |  | (499) |  |  | 170,984 |
Corporate debt securities | 19,448 |  |  | 109 |  |  | (94) |  |  | 19,463 |
Total securities available-for-sale | $ | 2,738,293 |  |  | $ | 16,865 |  |  | $ | (100,123) |  |  | $ | 2,655,035 |
Held-to-maturity securities: |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 920,199 |  |  | $ | 10,861 |  |  | $ | (39,849) |  |  | $ | 891,211 |
Agency mortgage-backed securities | 43,839 |  |  | — |  |  | (3,199) |  |  | 40,640 |
Corporate debt securities | 111,064 |  |  | 325 |  |  | (3,426) |  |  | 107,963 |
Total securities held-to-maturity | $ | 1,075,102 |  |  | $ | 11,186 |  |  | $ | (46,474) |  |  | $ | 1,039,814 |
ACL | (145) |  |  |  |  |  |  |
Total securities held-to-maturity, net | $ | 1,074,957 |  |  |  |  |  |  |
| December 31, 2024
($ in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-sale securities: |  |  |  |  |  |  |
Obligations of U.S. Government-sponsored enterprises | $ | 290,329 |  |  | $ | 69 |  |  | $ | (14,358) |  |  | $ | 276,040 |
Obligations of states and political subdivisions | 492,896 |  |  | 12 |  |  | (83,711) |  |  | 409,197 |
Agency mortgage-backed securities | 1,090,495 |  |  | 1,072 |  |  | (64,173) |  |  | 1,027,394 |
U.S. Treasury Bills | 130,565 |  |  | 34 |  |  | (1,706) |  |  | 128,893 |
Corporate debt securities | 21,198 |  |  | — |  |  | (452) |  |  | 20,746 |
Total securities available-for-sale | $ | 2,025,483 |  |  | $ | 1,187 |  |  | $ | (164,400) |  |  | $ | 1,862,270 |
Held-to-maturity securities: |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 759,059 |  |  | $ | 2,366 |  |  | $ | (60,351) |  |  | $ | 701,074 |
Agency mortgage-backed securities | 47,912 |  |  | — |  |  | (5,004) |  |  | 42,908 |
Corporate debt securities | 122,221 |  |  | 269 |  |  | (7,601) |  |  | 114,889 |
Total securities held-to-maturity | $ | 929,192 |  |  | $ | 2,635 |  |  | $ | (72,956) |  |  | $ | 858,871 |
ACL | (257) |  |  |  |  |  |  |
Total securities held-to-maturity, net | $ | 928,935 |  |  |  |  |  |  |
Debt Securities, Available-for-sale | The following tables present the amortized cost, gross unrealized gains and losses, ACL and fair value of securities available-for-sale and held-to-maturity as of the periods indicated:
| December 31, 2025
($ in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-sale securities: |  |  |  |  |  |  |
Obligations of U.S. Government-sponsored enterprises | $ | 187,587 |  |  | $ | 76 |  |  | $ | (5,091) |  |  | $ | 182,572 |
Obligations of states and political subdivisions | 626,900 |  |  | 3,914 |  |  | (58,109) |  |  | 572,705 |
Agency mortgage-backed securities | 1,733,003 |  |  | 12,638 |  |  | (36,330) |  |  | 1,709,311 |
U.S. Treasury Bills | 171,355 |  |  | 128 |  |  | (499) |  |  | 170,984 |
Corporate debt securities | 19,448 |  |  | 109 |  |  | (94) |  |  | 19,463 |
Total securities available-for-sale | $ | 2,738,293 |  |  | $ | 16,865 |  |  | $ | (100,123) |  |  | $ | 2,655,035 |
Held-to-maturity securities: |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 920,199 |  |  | $ | 10,861 |  |  | $ | (39,849) |  |  | $ | 891,211 |
Agency mortgage-backed securities | 43,839 |  |  | — |  |  | (3,199) |  |  | 40,640 |
Corporate debt securities | 111,064 |  |  | 325 |  |  | (3,426) |  |  | 107,963 |
Total securities held-to-maturity | $ | 1,075,102 |  |  | $ | 11,186 |  |  | $ | (46,474) |  |  | $ | 1,039,814 |
ACL | (145) |  |  |  |  |  |  |
Total securities held-to-maturity, net | $ | 1,074,957 |  |  |  |  |  |  |
| December 31, 2024
($ in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-sale securities: |  |  |  |  |  |  |
Obligations of U.S. Government-sponsored enterprises | $ | 290,329 |  |  | $ | 69 |  |  | $ | (14,358) |  |  | $ | 276,040 |
Obligations of states and political subdivisions | 492,896 |  |  | 12 |  |  | (83,711) |  |  | 409,197 |
Agency mortgage-backed securities | 1,090,495 |  |  | 1,072 |  |  | (64,173) |  |  | 1,027,394 |
U.S. Treasury Bills | 130,565 |  |  | 34 |  |  | (1,706) |  |  | 128,893 |
Corporate debt securities | 21,198 |  |  | — |  |  | (452) |  |  | 20,746 |
Total securities available-for-sale | $ | 2,025,483 |  |  | $ | 1,187 |  |  | $ | (164,400) |  |  | $ | 1,862,270 |
Held-to-maturity securities: |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 759,059 |  |  | $ | 2,366 |  |  | $ | (60,351) |  |  | $ | 701,074 |
Agency mortgage-backed securities | 47,912 |  |  | — |  |  | (5,004) |  |  | 42,908 |
Corporate debt securities | 122,221 |  |  | 269 |  |  | (7,601) |  |  | 114,889 |
Total securities held-to-maturity | $ | 929,192 |  |  | $ | 2,635 |  |  | $ | (72,956) |  |  | $ | 858,871 |
ACL | (257) |  |  |  |  |  |  |
Total securities held-to-maturity, net | $ | 928,935 |  |  |  |  |  |  |
Investments Classified by Contractual Maturity Date | The amortized cost and estimated fair value of debt securities at December 31, 2025, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The weighted average life of the mortgage-backed securities is approximately five years.
| Available-for-sale |  | Held-to-maturity
($ in thousands) | Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Due in one year or less | $ | 250,905 |  |  | $ | 249,646 |  |  | $ | 4,616 |  |  | $ | 4,616 |
Due after one year through five years | 76,242 |  |  | 74,783 |  |  | 129,862 |  |  | 127,143 |
Due after five years through ten years | 353,222 |  |  | 320,753 |  |  | 239,892 |  |  | 239,658 |
Due after ten years | 324,921 |  |  | 300,542 |  |  | 656,893 |  |  | 627,757 |
Agency mortgage-backed securities | 1,733,003 |  |  | 1,709,311 |  |  | 43,839 |  |  | 40,640 |
| $ | 2,738,293 |  |  | $ | 2,655,035 |  |  | $ | 1,075,102 |  |  | $ | 1,039,814 |
There were 681 and 830 available-for-sale securities in an unrealized loss position as of December 31, 2025 and 2024, respectively, included in the following tables:
| December 31, 2025
Less than 12 months |  | 12 months or more |  | Total
($ in thousands) | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Obligations of U.S. Government-sponsored enterprises | $ | 13,971 |  |  | $ | 22 |  |  | $ | 149,230 |  |  | $ | 5,069 |  |  | $ | 163,201 |  |  | $ | 5,091 |
Obligations of states and political subdivisions | 32,658 |  |  | 245 |  |  | 425,879 |  |  | 57,864 |  |  | 458,537 |  |  | 58,109 |
Agency mortgage-backed securities | 266,639 |  |  | 1,215 |  |  | 377,787 |  |  | 35,115 |  |  | 644,426 |  |  | 36,330 |
U.S. Treasury Bills | 4,996 |  |  | — |  |  | 40,418 |  |  | 499 |  |  | 45,414 |  |  | 499 |
Corporate debt securities | — |  |  | — |  |  | 3,406 |  |  | 94 |  |  | 3,406 |  |  | 94 |
| $ | 318,264 |  |  | $ | 1,482 |  |  | $ | 996,720 |  |  | $ | 98,641 |  |  | $ | 1,314,984 |  |  | $ | 100,123 |
| December 31, 2024
Less than 12 months |  | 12 months or more |  | Total
($ in thousands) | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Obligations of U.S. Government-sponsored enterprises | $ | 21,044 |  |  | $ | 132 |  |  | $ | 234,191 |  |  | $ | 14,226 |  |  | $ | 255,235 |  |  | $ | 14,358 |
Obligations of states and political subdivisions | 3,117 |  |  | 143 |  |  | 403,767 |  |  | 83,568 |  |  | 406,884 |  |  | 83,711 |
Agency mortgage-backed securities | 423,600 |  |  | 6,763 |  |  | 478,790 |  |  | 57,410 |  |  | 902,390 |  |  | 64,173 |
U.S. Treasury Bills | 11,708 |  |  | 23 |  |  | 54,177 |  |  | 1,683 |  |  | 65,885 |  |  | 1,706 |
Corporate debt securities | 1,956 |  |  | 44 |  |  | 8,342 |  |  | 408 |  |  | 10,298 |  |  | 452 |
| $ | 461,425 |  |  | $ | 7,105 |  |  | $ | 1,179,267 |  |  | $ | 157,295 |  |  | $ | 1,640,692 |  |  | $ | 164,400 |
Schedule of Realized Gain (Loss) | The following table presents a summary of proceeds, gross gains and losses realized from sales of available-for-sale investment securities for the periods indicated:
| Twelve months ended
($ in thousands) | December 31, 2025 |  | December 31, 2024 |  | December 31, 2023
Gross gains realized | $ | 1,631 |  |  | $ | — |  |  | $ | 601 |
Gross losses realized | (1,582) |  |  | — |  |  | — |
Proceeds from sales | 139,051 |  |  | — |  |  | 40,393 |

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