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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
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)