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Securities, AFS Securities in Continuous Unrealized Loss Position (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
Position
Dec. 31, 2019
USD ($)
Position
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 161,445 $ 198,501
12 months or longer 786 97,243
Total 162,231 295,744
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (549) (718)
12 months or longer (9) (815)
Total $ (558) $ (1,533)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 13 48
12 months or longer | Position 3 34
Total | Position 16 82
Federal Agency [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 154,448 $ 14,891
12 months or longer 0 9,866
Total 154,448 24,757
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (541) (109)
12 months or longer 0 (134)
Total $ (541) $ (243)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 10 2
12 months or longer | Position 0 1
Total | Position 10 3
State & Municipal [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 1,448 $ 2,503
12 months or longer 0 0
Total 1,448 2,503
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (2) (20)
12 months or longer 0 0
Total $ (2) $ (20)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 1 1
12 months or longer | Position 0 0
Total | Position 1 1
Mortgage-Backed [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 0 $ 67,986
12 months or longer 786 37,745
Total 786 105,731
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months 0 (273)
12 months or longer (9) (122)
Total $ (9) $ (395)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 0 21
12 months or longer | Position 3 16
Total | Position 3 37
Collateralized Mortgage Obligations [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 553 $ 113,121
12 months or longer 0 49,632
Total 553 162,753
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (2) (316)
12 months or longer 0 (559)
Total $ (2) $ (875)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 1 24
12 months or longer | Position 0 17
Total | Position 1 41
Corporate [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 4,996  
12 months or longer 0  
Total 4,996  
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (4)  
12 months or longer 0  
Total $ (4)  
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 1  
12 months or longer | Position 0  
Total | Position 1