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Securities, Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Available-for-sale, amortized cost [Abstract]    
Due in one year or less $ 4,288  
Due after one through five years 163,320  
Due after five through ten years 43,595  
Due after ten years 144,530  
Amortized cost 565,199 $ 583,939
CRA investment funds 25,000  
Amortized cost 590,199 608,939
Available-for-sale, fair value [Abstract]    
Due in one year or less 4,294  
Due after one through five years 162,977  
Due after five through ten years 44,022  
Due after ten years 144,294  
Total debt securities 561,403 581,036
CRA investment funds 24,358  
Total securities 585,761 605,394
Held-to-maturity, amortized cost [Abstract]    
Due in one year or less 0  
Due after one through five years 659  
Due after five through ten years 0  
Due after ten years 0  
Amortized cost 659 866
CRA investment funds 0  
Total securities 659  
Held-to-maturity, fair value [Abstract]    
Due in one year or less 0  
Due after one through five years 660  
Due after five through ten years 0  
Due after ten years 0  
Total debt securities 660 867
CRA investment funds 0  
Total securities 660  
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Without single maturity date 208,959  
Amortized cost 208,959 227,574
Available-for-sale, fair value [Abstract]    
Without single maturity date 205,309  
Total debt securities 205,309 225,056
Other Debt Obligations [Member]    
Available-for-sale, amortized cost [Abstract]    
Without single maturity date 507  
Amortized cost 507 0
Available-for-sale, fair value [Abstract]    
Without single maturity date 507  
Total debt securities 507 $ 0
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]    
Held-to-maturity, amortized cost [Abstract]    
Without single maturity date 0  
Held-to-maturity, fair value [Abstract]    
Without single maturity date 0  
Other Debt Obligations [Member]    
Held-to-maturity, amortized cost [Abstract]    
Without single maturity date 0  
Held-to-maturity, fair value [Abstract]    
Without single maturity date $ 0