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Securities, Available for Sale (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Debt securities, available-for-sale [Abstract]          
Amortized cost $ 1,073,888   $ 1,073,888   $ 968,554
Unrealized gains 34,596   34,596   8,319
Unrealized losses 41   41   1,533
Estimated fair value 1,108,443   1,108,443   975,340
Allowance for credit losses on AFS securities 0   0    
Sales transactions of securities available for sale [Abstract]          
Gross realized gains     3 $ 53  
Gross realized (losses)     0 (152)  
Net AFS realized gains (losses) 0 $ 0 3 (99)  
Gains from calls on securities available for sale 0 $ 0 3 $ 4  
Federal Agency [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 45,588   45,588   34,998
Unrealized gains 39   39   3
Unrealized losses 23   23   243
Estimated fair value 45,604   45,604   34,758
State & Municipal [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 2,529   2,529   2,533
Unrealized gains 160   160   0
Unrealized losses 0   0   20
Estimated fair value 2,689   2,689   2,513
Mortgage-Backed, Government Sponsored Enterprises [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 445,055   445,055   453,614
Unrealized gains 19,285   19,285   4,982
Unrealized losses 0   0   239
Estimated fair value 464,340   464,340   458,357
Mortgage-Backed, U.S. Government Agency Securities [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 49,967   49,967   44,758
Unrealized gains 2,283   2,283   667
Unrealized losses 9   9   156
Estimated fair value 52,241   52,241   45,269
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 382,562   382,562   328,499
Unrealized gains 8,340   8,340   1,949
Unrealized losses 4   4   467
Estimated fair value 390,898   390,898   329,981
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 138,187   138,187   104,152
Unrealized gains 4,352   4,352   718
Unrealized losses 5   5   408
Estimated fair value 142,534   142,534   $ 104,462
Corporate [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 10,000   10,000    
Unrealized gains 137   137    
Unrealized losses 0   0    
Estimated fair value $ 10,137   $ 10,137