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Investment Securities - Gross unrealized losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Investment securities available-for-sale    
Unrealized losses less than 12 months $ (10,290) $ (532)
Fair value less than 12 months 578,270 89,457
Unrealized losses over 12 months (1,681) (13)
Fair value over 12 months 55,084 3,667
Total Unrealized losses (11,971) (545)
Total Fair value 633,354 93,124
Held-to-maturity investment securities    
Unrealized losses less than 12 months (3,494)  
Fair value less than 12 months 257,583  
Total Unrealized losses (3,494)  
Total Fair value 257,583  
Unrealized losses less than 12 months (13,784)  
Fair value less than 12 months 835,853  
Unrealized losses over 12 months (1,681)  
Fair value over 12 months 55,084  
Total Unrealized losses (15,465)  
Total Fair value 890,937  
U.S. treasury and government agencies    
Investment securities available-for-sale    
Unrealized losses less than 12 months   (10)
Fair value less than 12 months   4,509
Unrealized losses over 12 months   (9)
Fair value over 12 months   1,309
Total Unrealized losses   (19)
Total Fair value   5,818
Obligations of state and political agencies.    
Held-to-maturity investment securities    
Unrealized losses less than 12 months (349)  
Fair value less than 12 months 53,210  
Total Unrealized losses (349)  
Total Fair value 53,210  
Mortgage backed securities - Residential agency    
Investment securities available-for-sale    
Unrealized losses less than 12 months (10,156) (432)
Fair value less than 12 months 554,811 68,494
Unrealized losses over 12 months (1,681) (4)
Fair value over 12 months 55,082 2,356
Total Unrealized losses (11,837) (436)
Total Fair value 609,893 70,850
Held-to-maturity investment securities    
Unrealized losses less than 12 months (3,145)  
Fair value less than 12 months 204,373  
Total Unrealized losses (3,145)  
Total Fair value 204,373  
Mortgage backed securities - Commercial    
Investment securities available-for-sale    
Unrealized losses less than 12 months (123)  
Fair value less than 12 months 17,470  
Total Unrealized losses (123)  
Total Fair value 17,470  
Asset backed securities    
Investment securities available-for-sale    
Fair value over 12 months 2 2
Total Fair value 2 2
Corporate bonds    
Investment securities available-for-sale    
Unrealized losses less than 12 months (11) (90)
Fair value less than 12 months 5,989 16,454
Total Unrealized losses (11) (90)
Total Fair value $ 5,989 $ 16,454