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Securities - Carrying Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Amortized Cost    
Within one year $ 0  
One to five years 34,855  
Five to ten years 64,591  
After ten years 78,922  
Amortized Cost 178,368  
Amortized cost 635,978 $ 497,004
Held-to-maturity securities, One to five years 5,793  
Held-to-maturity securities, Five to ten years 44,655  
Held-to-maturity securities, After ten years 11,681  
Held-to-maturity securities, Amortized Cost 62,129  
Fair Value    
Within one year 0  
One to five years 32,935  
Five to ten years 64,429  
After ten years 81,518  
Fair Value 178,882  
Fair Value 634,007 497,628
Held-to-maturity securities, One to five years 5,976  
Held-to-maturity securities, Five to ten years 46,320  
Held-to-maturity securities, After ten years 12,041  
Held-to-maturity securities, Fair Value 64,337  
Agency mortgage-backed securities    
Amortized Cost    
Amortized cost 432,613 241,795
Fair Value    
Fair Value 429,885 243,921
Private label mortgage-backed securities    
Amortized Cost    
Amortized cost 19,997 57,268
Fair Value    
Fair Value 20,235 58,116
Asset-backed securities    
Amortized Cost    
Amortized cost 5,000 5,000
Fair Value    
Fair Value $ 5,005 $ 4,961