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Securities, Available for Sale (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Debt securities, available-for-sale [Abstract]      
Amortized cost $ 972,858   $ 968,554
Unrealized gains 28,340   8,319
Unrealized losses 218   1,533
Estimated fair value 1,000,980   975,340
Allowance for credit losses on AFS securities 0    
Sales transactions of securities available for sale [Abstract]      
Gross realized gains 3 $ 53  
Gross realized (losses) 0 (152)  
Net AFS realized gains (losses) 3 (99)  
Gains from calls on securities available for sale 3 $ 4  
Federal Agency [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost     34,998
Unrealized gains     3
Unrealized losses     243
Estimated fair value     34,758
State & Municipal [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 2,533   2,533
Unrealized gains 86   0
Unrealized losses 0   20
Estimated fair value 2,619   2,513
Mortgage-Backed, Government Sponsored Enterprises [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 465,033   453,614
Unrealized gains 15,787   4,982
Unrealized losses 0   239
Estimated fair value 480,820   458,357
Mortgage-Backed, U.S. Government Agency Securities [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 50,109   44,758
Unrealized gains 1,249   667
Unrealized losses 55   156
Estimated fair value 51,303   45,269
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 308,833   328,499
Unrealized gains 9,221   1,949
Unrealized losses 95   467
Estimated fair value 317,959   329,981
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 146,350   104,152
Unrealized gains 1,997   718
Unrealized losses 68   408
Estimated fair value $ 148,279   $ 104,462