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Securities, Available for Sale (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt securities, available-for-sale [Abstract]      
Amortized cost $ 968,554 $ 1,017,626  
Unrealized gains 8,319 1,216  
Unrealized losses 1,533 20,346  
Estimated fair value 975,340 998,496  
Components of net realized gains (losses) on sale of AFS securities [Abstract]      
Gross realized gains 73 0 $ 2,241
Gross realized (losses) (152) (6,622) (372)
Net AFS realized (losses) gains (79) (6,622) 1,869
Gains from calls on securities available for sale 25 0 100
OTTI loss realized on equity investment 0 0 $ 1,300
Federal Agency [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 34,998 84,982  
Unrealized gains 3 10  
Unrealized losses 243 693  
Estimated fair value 34,758 84,299  
State & Municipal [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 2,533 30,136  
Unrealized gains 0 16  
Unrealized losses 20 237  
Estimated fair value 2,513 29,915  
Mortgage-Backed, Government Sponsored Enterprises [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 453,614 493,225  
Unrealized gains 4,982 439  
Unrealized losses 239 10,354  
Estimated fair value 458,357 483,310  
Mortgage-backed Securities, U.S. Government Agency Securities [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 44,758 29,190  
Unrealized gains 667 270  
Unrealized losses 156 475  
Estimated fair value 45,269 28,985  
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 328,499 332,409  
Unrealized gains 1,949 344  
Unrealized losses 467 7,211  
Estimated fair value 329,981 325,542  
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 104,152 47,684  
Unrealized gains 718 137  
Unrealized losses 408 1,376  
Estimated fair value $ 104,462 $ 46,445