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Securities, AFS Securities in Continuous Unrealized Loss Position (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Position
Dec. 31, 2018
USD ($)
Position
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 116,254 $ 32,295
12 months or longer 121,788 835,966
Total 238,042 868,261
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (272) (137)
12 months or longer (878) (20,209)
Total $ (1,150) $ (20,346)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 31 20
12 months or longer | Position 40 204
Total | Position 71 224
Federal Agency [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 19,965 $ 0
12 months or longer 9,866 64,294
Total 29,831 64,294
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (33) 0
12 months or longer (134) (693)
Total $ (167) $ (693)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 2 0
12 months or longer | Position 1 6
Total | Position 3 6
State & Municipal [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months   $ 1,715
12 months or longer   22,324
Total   24,039
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months   (3)
12 months or longer   (234)
Total   $ (237)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position   3
12 months or longer | Position   35
Total | Position   38
Mortgage-Backed [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 36,017 $ 18,462
12 months or longer 39,394 428,440
Total 75,411 446,902
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (69) (65)
12 months or longer (241) (10,764)
Total $ (310) $ (10,829)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 18 12
12 months or longer | Position 16 101
Total | Position 34 113
Collateralized Mortgage Obligations [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 60,272 $ 12,118
12 months or longer 72,528 320,908
Total 132,800 333,026
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months (170) (69)
12 months or longer (503) (8,518)
Total $ (673) $ (8,587)
Unrealized Loss Position, Number of Positions [Abstract]    
Less than 12 months | Position 11 5
12 months or longer | Position 23 62
Total | Position 34 67