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Securities, Available for Sale (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Debt securities, available-for-sale [Abstract]          
Amortized cost $ 924,437   $ 924,437   $ 1,017,626
Unrealized gains 8,886   8,886   1,216
Unrealized losses 1,150   1,150   20,346
Estimated fair value 932,173   932,173   998,496
Sales transactions of securities available for sale [Abstract]          
Gross realized gains 20 $ 0 73 $ 0  
Gross realized (losses) 0 0 (152) 0  
Net AFS realized gains (losses) 20 0 (79) 0  
Gains from calls on securities available for sale 20 0 25 0  
OTTI loss realized on debt investment 0 $ 0 0 $ 0  
Federal Agency [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 29,998   29,998   84,982
Unrealized gains 0   0   10
Unrealized losses 167   167   693
Estimated fair value 29,831   29,831   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 433,393   433,393   493,225
Unrealized gains 4,494   4,494   439
Unrealized losses 292   292   10,354
Estimated fair value 437,595   437,595   483,310
Mortgage-Backed, U.S. Government Agency Securities [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 44,912   44,912   29,190
Unrealized gains 1,021   1,021   270
Unrealized losses 18   18   475
Estimated fair value 45,915   45,915   28,985
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 343,682   343,682   332,409
Unrealized gains 2,484   2,484   344
Unrealized losses 456   456   7,211
Estimated fair value 345,710   345,710   325,542
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 72,443   72,443   47,684
Unrealized gains 887   887   137
Unrealized losses 217   217   1,376
Estimated fair value $ 73,113   $ 73,113   $ 46,445