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Securities - Contractural Maturities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Securities Available-for-Sale, Amortized Cost    
Due in one year or less $ 6,200  
Due after one year through five years 4,346  
Due after five years through ten years 6,013  
Due after ten years 273,568  
Debt securities excluding securities not due at a single maturity date 290,127  
Total $ 537,645 $ 545,433
Securities Available-for-Sale, Weighted Average Yield    
Due in one year or less (as a percent) 2.41%  
Due after one year through five years (as a percent) 2.03%  
Due after five years through ten years (as a percent) 3.29%  
Due after ten years (as a percent) 2.95%  
Debt securities (as a percent) 2.93%  
Total (as a percent) 2.99%  
Securities Available-for-Sale, Fair Value    
Due in one year or less $ 6,185  
Due after one year through five years 4,279  
Due after five years through ten years 6,234  
Due after ten years 279,235  
Debt securities 295,933  
Fair Value 541,439 531,838
Collateralized mortgage obligations    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date 79,264  
Total $ 66,892 174,352
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 2.94%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 78,153  
Fair Value 65,939 170,927
Asset-backed securities    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date 113,983  
Total $ 113,983 146,391
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 2.56%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 112,932  
Fair Value 112,932 138,407
Collateralized loan obligations    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date 54,271  
Total $ 54,271 102,504
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 4.32%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 54,421  
Fair Value $ 54,421 $ 101,637