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Securities - Contractural Maturities (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2018
Dec. 31, 2017
Securities Available-for-Sale, Amortized Cost      
Due in one year or less $ 18,800    
Due after one year through five years 4,207    
Due after five years through ten years 5,919    
Due after ten years 276,375    
Debt securities excluding securities not due at a single maturity date 305,301    
Total $ 555,991 $ 555,991 $ 537,645
Securities Available-for-Sale, Weighted Average Yield      
Due in one year or less (as a percent) 1.90%    
Due after one year through five years (as a percent) 1.96%    
Due after five years through ten years (as a percent) 3.34%    
Due after ten years (as a percent) 2.96%    
Debt securities (as a percent) 2.89%    
Total (as a percent) 3.10%    
Securities Available-for-Sale, Fair Value      
Due in one year or less $ 18,645    
Due after one year through five years 4,095    
Due after five years through ten years 6,017    
Due after ten years 274,111    
Debt securities 302,868    
Fair Value 550,942 550,942 541,439
Collateralized mortgage obligations      
Securities Available-for-Sale, Amortized Cost      
Total   65,561 66,892
Securities Available-for-Sale, Fair Value      
Fair Value   63,744 65,939
Asset-backed securities      
Securities Available-for-Sale, Amortized Cost      
Securities not due at a single maturity date $ 111,493    
Total   111,493 113,983
Securities Available-for-Sale, Weighted Average Yield      
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 2.93%    
Securities Available-for-Sale, Fair Value      
Securities not due at a single maturity date $ 110,870    
Fair Value   110,870 112,932
Collateralized loan obligations      
Securities Available-for-Sale, Amortized Cost      
Securities not due at a single maturity date $ 59,305    
Total   59,305 54,271
Securities Available-for-Sale, Weighted Average Yield      
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 4.64%    
Securities Available-for-Sale, Fair Value      
Securities not due at a single maturity date $ 59,616    
Fair Value   $ 59,616 $ 54,421
Mortgage-backed and collateralized mortgage obligations      
Securities Available-for-Sale, Amortized Cost      
Securities not due at a single maturity date $ 79,892    
Securities Available-for-Sale, Weighted Average Yield      
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 2.98%    
Securities Available-for-Sale, Fair Value      
Securities not due at a single maturity date $ 77,588