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v3.25.4

Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | $ 2,738,293 | $ 2,025,483
Gross Unrealized Gains | 16,865 | 1,187
Gross Unrealized Losses | (100,123) | (164,400)
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 2,655,035 | 1,862,270
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 1,075,102 | 929,192
Gross Unrealized Gains | 11,186 | 2,635
Gross Unrealized Losses | (46,474) | (72,956)
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest | (145) | (257)
Debt Securities, Held-to-maturity, Fair Value | 1,039,814 | 858,871
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total | 1,074,957 | 928,935
US Government-sponsored Enterprises Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 187,587 | 290,329
Gross Unrealized Gains | 76 | 69
Gross Unrealized Losses | (5,091) | (14,358)
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 182,572 | 276,040
US States and Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 626,900 | 492,896
Gross Unrealized Gains | 3,914 | 12
Gross Unrealized Losses | (58,109) | (83,711)
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 572,705 | 409,197
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 920,199 | 759,059
Gross Unrealized Gains | 10,861 | 2,366
Gross Unrealized Losses | (39,849) | (60,351)
Debt Securities, Held-to-maturity, Fair Value | 891,211 | 701,074
Agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 1,733,003 | 1,090,495
Gross Unrealized Gains | 12,638 | 1,072
Gross Unrealized Losses | (36,330) | (64,173)
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 1,709,311 | 1,027,394
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 43,839 | 47,912
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (3,199) | (5,004)
Debt Securities, Held-to-maturity, Fair Value | 40,640 | 42,908
US Treasury Bill Securities [Member] |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 19,448 | 21,198
Gross Unrealized Gains | 109 | 0
Gross Unrealized Losses | (94) | (452)
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 19,463 | 20,746
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 171,355 | 130,565
Gross Unrealized Gains | 128 | 34
Gross Unrealized Losses | (499) | (1,706)
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 170,984 | 128,893
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 111,064 | 122,221
Gross Unrealized Gains | 325 | 269
Gross Unrealized Losses | (3,426) | (7,601)
Debt Securities, Held-to-maturity, Fair Value | $ 107,963 | $ 114,889

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