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Securities, Available for Sale (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt securities, available-for-sale [Abstract]      
Amortized cost $ 1,017,626    
Unrealized gains 1,216    
Unrealized losses 20,346    
Estimated fair value 998,496    
Total available-for-sale securities [Abstract]      
Amortized cost   $ 1,266,165  
Unrealized gains   5,893  
Unrealized losses   16,133  
Estimated fair value 998,496 1,255,925  
Sales transactions of securities available for sale [Abstract]      
Gross realized gains 0 2,241 $ 683
Gross realized (losses) (6,622) (372) (1,327)
Net AFS realized gains (losses) (6,622) 1,869 (644)
Gains from calls on securities available for sale 0 100 100
OTTI loss realized on equity investment 0 1,300 $ 0
Federal Agency [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 84,982 109,862  
Unrealized gains 10 0  
Unrealized losses 693 963  
Estimated fair value 84,299 108,899  
State & Municipal [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 30,136 42,171  
Unrealized gains 16 62  
Unrealized losses 237 277  
Estimated fair value 29,915 41,956  
Mortgage-Backed, Government Sponsored Enterprises [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 493,225 530,392  
Unrealized gains 439 1,406  
Unrealized losses 10,354 3,345  
Estimated fair value 483,310 528,453  
Mortgage-backed Securities, U.S. Government Agency Securities [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 29,190 26,363  
Unrealized gains 270 334  
Unrealized losses 475 223  
Estimated fair value 28,985 26,474  
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 332,409 496,033  
Unrealized gains 344 254  
Unrealized losses 7,211 10,114  
Estimated fair value 325,542 486,173  
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 47,684 50,721  
Unrealized gains 137 165  
Unrealized losses 1,376 1,065  
Estimated fair value $ 46,445 49,821  
Equity Securities [Member]      
Equity securities, available-for-sale [Abstract]      
Amortized cost   10,623  
Unrealized gains   3,672  
Unrealized losses   146  
Estimated fair value   $ 14,149