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Securities, Available for Sale (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Debt securities, available-for-sale [Abstract]          
Amortized cost $ 974,300   $ 974,300   $ 1,017,626
Unrealized gains 7,551   7,551   1,216
Unrealized losses 2,155   2,155   20,346
Estimated fair value 979,696   979,696   998,496
Sales transactions of securities available for sale [Abstract]          
Gross realized gains 0 $ 0 53 $ 0  
Gross realized (losses) 0 0 (152) 0  
Net AFS realized (losses) 0 0 (99) 0  
Gains from calls on securities available for sale 0 0 4 0  
OTTI loss realized on equity investment 0 $ 0 0 $ 0  
Federal Agency [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 52,987   52,987   84,982
Unrealized gains 28   28   10
Unrealized losses 178   178   693
Estimated fair value 52,837   52,837   84,299
State & Municipal [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 9   9   30,136
Unrealized gains 0   0   16
Unrealized losses 0   0   237
Estimated fair value 9   9   29,915
Mortgage-Backed, Government Sponsored Enterprises [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 458,878   458,878   493,225
Unrealized gains 3,624   3,624   439
Unrealized losses 666   666   10,354
Estimated fair value 461,836   461,836   483,310
Mortgage-Backed, U.S. Government Agency Securities [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 36,447   36,447   29,190
Unrealized gains 955   955   270
Unrealized losses 11   11   475
Estimated fair value 37,391   37,391   28,985
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 351,250   351,250   332,409
Unrealized gains 2,210   2,210   344
Unrealized losses 847   847   7,211
Estimated fair value 352,613   352,613   325,542
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 74,729   74,729   47,684
Unrealized gains 734   734   137
Unrealized losses 453   453   1,376
Estimated fair value $ 75,010   $ 75,010   $ 46,445