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Securities - Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair value less than 12 months | $ 124,570 | $ 880,068
Unrealized losses less than 12 months | (7,571) | (75,452)
Fair value more than 12 months | 2,287,148 | 1,719,396
Unrealized losses more than 12 months | (561,874) | (406,840)
Total fair value | 2,411,718 | 2,599,464
Total unrealized losses | (569,445) | (482,292)
U.S. Treasury and federal agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value less than 12 months | 1,322 | 217,357
Unrealized losses less than 12 months | (12) | (16,692)
Fair value more than 12 months | 498,536 | 295,585
Unrealized losses more than 12 months | (81,476) | (59,695)
Total fair value | 499,858 | 512,942
Total unrealized losses | (81,488) | (76,387)
State and municipal |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value less than 12 months | 123,235 | 533,871
Unrealized losses less than 12 months | (7,558) | (45,881)
Fair value more than 12 months | 1,066,492 | 757,061
Unrealized losses more than 12 months | (320,865) | (218,179)
Total fair value | 1,189,727 | 1,290,932
Total unrealized losses | (328,423) | (264,060)
Federal agency collateralized mortgage obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value less than 12 months | 0 | 40,301
Unrealized losses less than 12 months | 0 | (2,881)
Fair value more than 12 months | 63,990 | 38,613
Unrealized losses more than 12 months | (11,793) | (7,780)
Total fair value | 63,990 | 78,914
Total unrealized losses | (11,793) | (10,661)
Federal agency mortgage-backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value less than 12 months | 13 | 49,633
Unrealized losses less than 12 months | (1) | (3,211)
Fair value more than 12 months | 429,933 | 428,243
Unrealized losses more than 12 months | (99,191) | (83,810)
Total fair value | 429,946 | 477,876
Total unrealized losses | (99,192) | (87,021)
Private labeled mortgage-backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value less than 12 months | 0 | 0
Unrealized losses less than 12 months | 0 | 0
Fair value more than 12 months | 27,298 | 29,973
Unrealized losses more than 12 months | (5,694) | (5,493)
Total fair value | 27,298 | 29,973
Total unrealized losses | (5,694) | (5,493)
Corporate notes |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value less than 12 months | 0 | 38,906
Unrealized losses less than 12 months | 0 | (6,787)
Fair value more than 12 months | 200,899 | 169,921
Unrealized losses more than 12 months | (42,855) | (31,883)
Total fair value | 200,899 | 208,827
Total unrealized losses | $ (42,855) | $ (38,670)

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