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Investment Securities - Unrealized Losses and Estimated Fair Value of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | $ 72,674 | $ 134,631
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (1,076) | (3,744)
Fair Value of Available-for-Sale Securities, 12 Months or More | 2,405,247 | 2,566,329
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (243,930) | (334,860)
Fair Value of Available-for-Sale Securities, Total | 2,477,921 | 2,700,960
Unrealized Losses of Available-for-Sale Securities, Total | (245,006) | (338,604)
Held-to-maturity: |  |
Fair Value of Held-to-Maturity Securities, Less Than 12 Months | 19,050 | 77,866
Unrealized Losses of Held-to-Maturity Securities, Less Than 12 Months | (524) | (3,016)
Fair Value of Held-to-Maturity Securities, 12 Months or More | 1,099,378 | 1,064,094
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (107,001) | (129,287)
Fair Value of Held-to-Maturity Securities, Total | 1,118,428 | 1,141,960
Unrealized Losses of Held-to-Maturity Securities | (107,525) | (132,303)
U.S. government-sponsored enterprises |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 16,429 | 25,946
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (64) | (326)
Fair Value of Available-for-Sale Securities, 12 Months or More | 164,831 | 161,759
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (8,330) | (13,746)
Fair Value of Available-for-Sale Securities, Total | 181,260 | 187,705
Unrealized Losses of Available-for-Sale Securities, Total | (8,394) | (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 | 42,247 | 40,539
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (1,523) | (3,021)
Fair Value of Held-to-Maturity Securities, Total | 42,247 | 40,539
Unrealized Losses of Held-to-Maturity Securities | (1,523) | (3,021)
U.S. government-sponsored mortgage-backed securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 15,657 | 34,597
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (22) | (1,088)
Fair Value of Available-for-Sale Securities, 12 Months or More | 1,128,946 | 1,215,317
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (138,519) | (202,451)
Fair Value of Available-for-Sale Securities, Total | 1,144,603 | 1,249,914
Unrealized Losses of Available-for-Sale Securities, Total | (138,541) | (203,539)
Held-to-maturity: |  |
Fair Value of Held-to-Maturity Securities, Less Than 12 Months | 6,583 | 48,254
Unrealized Losses of Held-to-Maturity Securities, Less Than 12 Months | (42) | (1,979)
Fair Value of Held-to-Maturity Securities, 12 Months or More | 74,627 | 69,220
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (3,324) | (4,716)
Fair Value of Held-to-Maturity Securities, Total | 81,210 | 117,474
Unrealized Losses of Held-to-Maturity Securities | (3,366) | (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 | 138,047 | 161,903
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (7,417) | (13,120)
Fair Value of Available-for-Sale Securities, Total | 138,047 | 171,394
Unrealized Losses of Available-for-Sale Securities, Total | (7,417) | (13,249)
Non-government-sponsored asset backed securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 642 | 10,849
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (1) | (60)
Fair Value of Available-for-Sale Securities, 12 Months or More | 56,007 | 92,857
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (1,066) | (3,374)
Fair Value of Available-for-Sale Securities, Total | 56,649 | 103,706
Unrealized Losses of Available-for-Sale Securities, Total | (1,067) | (3,434)
State and political subdivisions |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 28,597 | 46,591
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (911) | (1,230)
Fair Value of Available-for-Sale Securities, 12 Months or More | 750,624 | 761,289
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (77,308) | (84,799)
Fair Value of Available-for-Sale Securities, Total | 779,221 | 807,880
Unrealized Losses of Available-for-Sale Securities, Total | (78,219) | (86,029)
Held-to-maturity: |  |
Fair Value of Held-to-Maturity Securities, Less Than 12 Months | 12,467 | 29,612
Unrealized Losses of Held-to-Maturity Securities, Less Than 12 Months | (482) | (1,037)
Fair Value of Held-to-Maturity Securities, 12 Months or More | 982,504 | 954,335
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (102,154) | (121,550)
Fair Value of Held-to-Maturity Securities, Total | 994,971 | 983,947
Unrealized Losses of Held-to-Maturity Securities | (102,636) | (122,587)
Other securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 11,349 | 7,157
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (78) | (911)
Fair Value of Available-for-Sale Securities, 12 Months or More | 166,792 | 173,204
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (11,290) | (17,370)
Fair Value of Available-for-Sale Securities, Total | 178,141 | 180,361
Unrealized Losses of Available-for-Sale Securities, Total | $ (11,368) | $ (18,281)

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