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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months $ 1,500,687 $ 79,860
Unrealized losses less than 12 months (21,993) (294)
Fair value more than 12 months 35,281 1,245
Unrealized losses more than 12 months (1,012) (29)
Total fair value 1,535,968 81,105
Total unrealized losses (23,005) (323)
U.S. Treasury and federal agencies    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 268,732 17,215
Unrealized losses less than 12 months (2,483) (35)
Fair value more than 12 months 15,820 0
Unrealized losses more than 12 months (430) 0
Total fair value 284,552 17,215
Total unrealized losses (2,913) (35)
State and municipal    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 539,882 56,287
Unrealized losses less than 12 months (9,389) (242)
Fair value more than 12 months 19,461 1,245
Unrealized losses more than 12 months (582) (29)
Total fair value 559,343 57,532
Total unrealized losses (9,971) (271)
Federal agency collateralized mortgage obligations    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 56,027 6,358
Unrealized losses less than 12 months (1,032) (17)
Fair value more than 12 months 0 0
Unrealized losses more than 12 months 0 0
Total fair value 56,027 6,358
Total unrealized losses (1,032) $ (17)
Federal agency mortgage–backed pools    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 333,489  
Unrealized losses less than 12 months (3,644)  
Fair value more than 12 months 0  
Unrealized losses more than 12 months 0  
Total fair value 333,489  
Total unrealized losses (3,644)  
Private labeled mortgage–backed pools    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 113,057  
Unrealized losses less than 12 months (2,216)  
Fair value more than 12 months 0  
Unrealized losses more than 12 months 0  
Total fair value 113,057  
Total unrealized losses (2,216)  
Corporate notes    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 189,500  
Unrealized losses less than 12 months (3,229)  
Fair value more than 12 months 0  
Unrealized losses more than 12 months 0  
Total fair value 189,500  
Total unrealized losses $ (3,229)