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Securities - Schedule of Gross Unrealized Losses and Fair Value of Company's Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair value less than 12 months | $ 2,387 | $ 880,068
Unrealized losses less than 12 months | (236) | (75,452)
Fair value more than 12 months | 543,248 | 1,719,396
Unrealized losses more than 12 months | (87,583) | (406,840)
Total fair value | 545,635 | 2,599,464
Total unrealized losses | (87,819) | (482,292)
U.S. Treasury and federal agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value less than 12 months | 0 | 217,357
Unrealized losses less than 12 months | 0 | (16,692)
Fair value more than 12 months | 64,377 | 295,585
Unrealized losses more than 12 months | (8,561) | (59,695)
Total fair value | 64,377 | 512,942
Total unrealized losses | (8,561) | (76,387)
State and municipal |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value less than 12 months | 2,387 | 533,871
Unrealized losses less than 12 months | (236) | (45,881)
Fair value more than 12 months | 301,643 | 757,061
Unrealized losses more than 12 months | (49,033) | (218,179)
Total fair value | 304,030 | 1,290,932
Total unrealized losses | (49,269) | (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 | 3,580 | 38,613
Unrealized losses more than 12 months | (351) | (7,780)
Total fair value | 3,580 | 78,914
Total unrealized losses | (351) | (10,661)
Federal agency mortgage–backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value less than 12 months | 0 | 49,633
Unrealized losses less than 12 months | 0 | (3,211)
Fair value more than 12 months | 137,289 | 428,243
Unrealized losses more than 12 months | (23,833) | (83,810)
Total fair value | 137,289 | 477,876
Total unrealized losses | (23,833) | (87,021)
Private labeled mortgage–backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value less than 12 months |  | 0
Unrealized losses less than 12 months |  | 0
Fair value more than 12 months |  | 29,973
Unrealized losses more than 12 months |  | (5,493)
Total fair value |  | 29,973
Total unrealized losses |  | (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 | 36,359 | 169,921
Unrealized losses more than 12 months | (5,805) | (31,883)
Total fair value | 36,359 | 208,827
Total unrealized losses | $ (5,805) | $ (38,670)

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