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Securities - Contractural Maturities (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2017
Sep. 30, 2018
Dec. 31, 2017
Securities Available-for-Sale, Amortized Cost      
Due in one year or less $ 1,500    
Due after one year through five years 4,005    
Due after five years through ten years 6,688    
Due after ten years 282,297    
Debt securities excluding securities not due at a single maturity date 294,490    
Total $ 551,903 $ 551,903 $ 537,645
Securities Available-for-Sale, Weighted Average Yield      
Due in one year or less (as a percent) 4.78%    
Due after one year through five years (as a percent) 1.85%    
Due after five years through ten years (as a percent) 3.03%    
Due after ten years (as a percent) 3.00%    
Debt securities (as a percent) 3.00%    
Total (as a percent) 3.28%    
Securities Available-for-Sale, Fair Value      
Due in one year or less $ 1,502    
Due after one year through five years 3,854    
Due after five years through ten years 6,626    
Due after ten years 275,839    
Debt securities 287,821    
Fair Value 542,338 542,338 541,439
Collateralized mortgage obligations      
Securities Available-for-Sale, Amortized Cost      
Total   67,762 66,892
Securities Available-for-Sale, Fair Value      
Fair Value   64,960 65,939
Asset-backed securities      
Securities Available-for-Sale, Amortized Cost      
Securities not due at a single maturity date $ 108,622    
Total   108,622 113,983
Securities Available-for-Sale, Weighted Average Yield      
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 3.22%    
Securities Available-for-Sale, Fair Value      
Securities not due at a single maturity date $ 109,173    
Fair Value   109,173 112,932
Collateralized loan obligations      
Securities Available-for-Sale, Amortized Cost      
Securities not due at a single maturity date $ 65,555    
Total   65,555 54,271
Securities Available-for-Sale, Weighted Average Yield      
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 4.71%    
Securities Available-for-Sale, Fair Value      
Securities not due at a single maturity date $ 65,618    
Fair Value   $ 65,618 $ 54,421
Mortgage-backed and collateralized mortgage obligations      
Securities Available-for-Sale, Amortized Cost      
Securities not due at a single maturity date $ 83,236    
Securities Available-for-Sale, Weighted Average Yield      
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 3.21%    
Securities Available-for-Sale, Fair Value      
Securities not due at a single maturity date $ 79,726