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Investment Securities - Unrealized Losses and Estimated Fair Value of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | $ 209,223 | $ 134,631
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (2,248) | (3,744)
Fair Value of Available-for-Sale Securities, 12 Months or More | 2,533,587 | 2,566,329
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (295,245) | (334,860)
Fair Value of Available-for-Sale Securities, Total | 2,742,810 | 2,700,960
Unrealized Losses of Available-for-Sale Securities, Total | (297,493) | (338,604)
Held-to-maturity: |  |
Fair Value of Held-to-Maturity Securities, Less Than 12 Months | 69,880 | 77,866
Unrealized Losses of Held-to-Maturity Securities, Less Than 12 Months | (1,633) | (3,016)
Fair Value of Held-to-Maturity Securities, 12 Months or More | 1,076,183 | 1,064,094
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (115,093) | (129,287)
Fair Value of Held-to-Maturity Securities, Total | 1,146,063 | 1,141,960
Unrealized Losses of Held-to-Maturity Securities | (116,726) | (132,303)
U.S. government-sponsored enterprises |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 24,208 | 25,946
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (215) | (326)
Fair Value of Available-for-Sale Securities, 12 Months or More | 163,377 | 161,759
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (11,305) | (13,746)
Fair Value of Available-for-Sale Securities, Total | 187,585 | 187,705
Unrealized Losses of Available-for-Sale Securities, Total | (11,520) | (14,072)
Held-to-maturity: |  |
Fair Value of Held-to-Maturity Securities, Less Than 12 Months | 0 | 0
Unrealized Losses of Held-to-Maturity Securities, Less Than 12 Months | 0 | 0
Fair Value of Held-to-Maturity Securities, 12 Months or More | 41,380 | 40,539
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (2,249) | (3,021)
Fair Value of Held-to-Maturity Securities, Total | 41,380 | 40,539
Unrealized Losses of Held-to-Maturity Securities | (2,249) | (3,021)
U.S. government-sponsored mortgage-backed securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 33,859 | 34,597
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (214) | (1,088)
Fair Value of Available-for-Sale Securities, 12 Months or More | 1,186,597 | 1,215,317
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (169,312) | (202,451)
Fair Value of Available-for-Sale Securities, Total | 1,220,456 | 1,249,914
Unrealized Losses of Available-for-Sale Securities, Total | (169,526) | (203,539)
Held-to-maturity: |  |
Fair Value of Held-to-Maturity Securities, Less Than 12 Months | 50,635 | 48,254
Unrealized Losses of Held-to-Maturity Securities, Less Than 12 Months | (866) | (1,979)
Fair Value of Held-to-Maturity Securities, 12 Months or More | 62,274 | 69,220
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (3,643) | (4,716)
Fair Value of Held-to-Maturity Securities, Total | 112,909 | 117,474
Unrealized Losses of Held-to-Maturity Securities | (4,509) | (6,695)
Private mortgage-backed securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 0 | 9,491
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | 0 | (129)
Fair Value of Available-for-Sale Securities, 12 Months or More | 161,674 | 161,903
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (10,541) | (13,120)
Fair Value of Available-for-Sale Securities, Total | 161,674 | 171,394
Unrealized Losses of Available-for-Sale Securities, Total | (10,541) | (13,249)
Non-government-sponsored asset backed securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 105,201 | 10,849
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (223) | (60)
Fair Value of Available-for-Sale Securities, 12 Months or More | 85,633 | 92,857
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (2,549) | (3,374)
Fair Value of Available-for-Sale Securities, Total | 190,834 | 103,706
Unrealized Losses of Available-for-Sale Securities, Total | (2,772) | (3,434)
State and political subdivisions |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 40,072 | 46,591
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (1,332) | (1,230)
Fair Value of Available-for-Sale Securities, 12 Months or More | 757,250 | 761,289
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (86,529) | (84,799)
Fair Value of Available-for-Sale Securities, Total | 797,322 | 807,880
Unrealized Losses of Available-for-Sale Securities, Total | (87,861) | (86,029)
Held-to-maturity: |  |
Fair Value of Held-to-Maturity Securities, Less Than 12 Months | 19,245 | 29,612
Unrealized Losses of Held-to-Maturity Securities, Less Than 12 Months | (767) | (1,037)
Fair Value of Held-to-Maturity Securities, 12 Months or More | 972,529 | 954,335
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (109,201) | (121,550)
Fair Value of Held-to-Maturity Securities, Total | 991,774 | 983,947
Unrealized Losses of Held-to-Maturity Securities | (109,968) | (122,587)
Other securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 5,883 | 7,157
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (264) | (911)
Fair Value of Available-for-Sale Securities, 12 Months or More | 179,056 | 173,204
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (15,009) | (17,370)
Fair Value of Available-for-Sale Securities, Total | 184,939 | 180,361
Unrealized Losses of Available-for-Sale Securities, Total | $ (15,273) | $ (18,281)

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