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Investment Securities - Unrealized Losses and Estimated Fair Value of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | $ 144,981 | $ 134,631
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (2,947) | (3,744)
Fair Value of Available-for-Sale Securities, 12 Months or More | 2,421,104 | 2,566,329
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (309,389) | (334,860)
Fair Value of Available-for-Sale Securities, Total | 2,566,085 | 2,700,960
Unrealized Losses of Available-for-Sale Securities, Total | (312,336) | (338,604)
Held-to-maturity: |  |
Fair Value of Held-to-Maturity Securities, Less Than 12 Months | 72,621 | 77,866
Unrealized Losses of Held-to-Maturity Securities, Less Than 12 Months | (2,395) | (3,016)
Fair Value of Held-to-Maturity Securities, 12 Months or More | 1,045,183 | 1,064,094
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (135,926) | (129,287)
Fair Value of Held-to-Maturity Securities, Total | 1,117,804 | 1,141,960
Unrealized Losses of Held-to-Maturity Securities | (138,321) | (132,303)
U.S. government-sponsored enterprises |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 13,552 | 25,946
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (134) | (326)
Fair Value of Available-for-Sale Securities, 12 Months or More | 163,744 | 161,759
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (10,180) | (13,746)
Fair Value of Available-for-Sale Securities, Total | 177,296 | 187,705
Unrealized Losses of Available-for-Sale Securities, Total | (10,314) | (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 | 41,608 | 40,539
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (2,091) | (3,021)
Fair Value of Held-to-Maturity Securities, Total | 41,608 | 40,539
Unrealized Losses of Held-to-Maturity Securities | (2,091) | (3,021)
U.S. government-sponsored mortgage-backed securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 47,193 | 34,597
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (371) | (1,088)
Fair Value of Available-for-Sale Securities, 12 Months or More | 1,131,637 | 1,215,317
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (171,095) | (202,451)
Fair Value of Available-for-Sale Securities, Total | 1,178,830 | 1,249,914
Unrealized Losses of Available-for-Sale Securities, Total | (171,466) | (203,539)
Held-to-maturity: |  |
Fair Value of Held-to-Maturity Securities, Less Than 12 Months | 47,304 | 48,254
Unrealized Losses of Held-to-Maturity Securities, Less Than 12 Months | (1,172) | (1,979)
Fair Value of Held-to-Maturity Securities, 12 Months or More | 60,994 | 69,220
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (4,131) | (4,716)
Fair Value of Held-to-Maturity Securities, Total | 108,298 | 117,474
Unrealized Losses of Held-to-Maturity Securities | (5,303) | (6,695)
Private mortgage-backed securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 9,656 | 9,491
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (11) | (129)
Fair Value of Available-for-Sale Securities, 12 Months or More | 145,926 | 161,903
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (10,678) | (13,120)
Fair Value of Available-for-Sale Securities, Total | 155,582 | 171,394
Unrealized Losses of Available-for-Sale Securities, Total | (10,689) | (13,249)
Non-government-sponsored asset backed securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 13,916 | 10,849
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (9) | (60)
Fair Value of Available-for-Sale Securities, 12 Months or More | 69,888 | 92,857
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (1,729) | (3,374)
Fair Value of Available-for-Sale Securities, Total | 83,804 | 103,706
Unrealized Losses of Available-for-Sale Securities, Total | (1,738) | (3,434)
State and political subdivisions |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 57,154 | 46,591
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (2,364) | (1,230)
Fair Value of Available-for-Sale Securities, 12 Months or More | 728,273 | 761,289
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (100,707) | (84,799)
Fair Value of Available-for-Sale Securities, Total | 785,427 | 807,880
Unrealized Losses of Available-for-Sale Securities, Total | (103,071) | (86,029)
Held-to-maturity: |  |
Fair Value of Held-to-Maturity Securities, Less Than 12 Months | 25,317 | 29,612
Unrealized Losses of Held-to-Maturity Securities, Less Than 12 Months | (1,223) | (1,037)
Fair Value of Held-to-Maturity Securities, 12 Months or More | 942,581 | 954,335
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (129,704) | (121,550)
Fair Value of Held-to-Maturity Securities, Total | 967,898 | 983,947
Unrealized Losses of Held-to-Maturity Securities | (130,927) | (122,587)
Other securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 3,510 | 7,157
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (58) | (911)
Fair Value of Available-for-Sale Securities, 12 Months or More | 181,636 | 173,204
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (15,000) | (17,370)
Fair Value of Available-for-Sale Securities, Total | 185,146 | 180,361
Unrealized Losses of Available-for-Sale Securities, Total | $ (15,058) | $ (18,281)

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