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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months $ 552,104 $ 79,860
Unrealized losses less than 12 months (5,946) (294)
Fair value more than 12 months 1,435 1,245
Unrealized losses more than 12 months (90) (29)
Total fair value 553,539 81,105
Total unrealized losses (6,036) (323)
U.S. Treasury and federal agencies    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 96,033 17,215
Unrealized losses less than 12 months (617) (35)
Fair value more than 12 months 0 0
Unrealized losses more than 12 months 0 0
Total fair value 96,033 17,215
Total unrealized losses (617) (35)
State and municipal    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 346,889 56,287
Unrealized losses less than 12 months (5,103) (242)
Fair value more than 12 months 1,435 1,245
Unrealized losses more than 12 months (90) (29)
Total fair value 348,324 57,532
Total unrealized losses (5,193) (271)
Federal agency collateralized mortgage obligations    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 412 6,358
Unrealized losses less than 12 months (2) (17)
Fair value more than 12 months 0 0
Unrealized losses more than 12 months 0 0
Total fair value 412 6,358
Total unrealized losses (2) $ (17)
Federal agency mortgage-backed pools    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 77,091  
Unrealized losses less than 12 months (147)  
Fair value more than 12 months 0  
Unrealized losses more than 12 months 0  
Total fair value 77,091  
Total unrealized losses (147)  
Private labeled mortgage-backed pools    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 9,510  
Unrealized losses less than 12 months (14)  
Fair value more than 12 months 0  
Unrealized losses more than 12 months 0  
Total fair value 9,510  
Total unrealized losses (14)  
Corporate notes    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 22,169  
Unrealized losses less than 12 months (63)  
Fair value more than 12 months 0  
Unrealized losses more than 12 months 0  
Total fair value 22,169  
Total unrealized losses $ (63)