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Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | $ 2,453,762 | $ 2,025,483
Gross Unrealized Gains | 14,551 | 1,187
Gross Unrealized Losses | (116,820) | (164,400)
Fair Value | 2,351,493 | 1,862,270
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 1,082,017 | 929,192
Gross Unrealized Gains | 7,311 | 2,635
Gross Unrealized Losses | (56,967) | (72,956)
Fair Value | 1,032,361 | 858,871
Allowance for credit losses | (170) | (257)
Total securities held-to-maturity, net | 1,081,847 | 928,935
Obligations of U.S. Government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 252,046 | 290,329
Gross Unrealized Gains | 158 | 69
Gross Unrealized Losses | (7,698) | (14,358)
Fair Value | 244,506 | 276,040
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 590,182 | 492,896
Gross Unrealized Gains | 2,226 | 12
Gross Unrealized Losses | (67,662) | (83,711)
Fair Value | 524,746 | 409,197
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 925,829 | 759,059
Gross Unrealized Gains | 6,999 | 2,366
Gross Unrealized Losses | (49,430) | (60,351)
Fair Value | 883,398 | 701,074
Agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 1,473,138 | 1,090,495
Gross Unrealized Gains | 11,987 | 1,072
Gross Unrealized Losses | (40,573) | (64,173)
Fair Value | 1,444,552 | 1,027,394
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 44,837 | 47,912
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (3,509) | (5,004)
Fair Value | 41,328 | 42,908
U.S. Treasury bills |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 114,698 | 130,565
Gross Unrealized Gains | 60 | 34
Gross Unrealized Losses | (717) | (1,706)
Fair Value | 114,041 | 128,893
Corporate debt securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 23,698 | 21,198
Gross Unrealized Gains | 120 | 0
Gross Unrealized Losses | (170) | (452)
Fair Value | 23,648 | 20,746
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 111,351 | 122,221
Gross Unrealized Gains | 312 | 269
Gross Unrealized Losses | (4,028) | (7,601)
Fair Value | $ 107,635 | $ 114,889

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