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Securities - Contractural Maturities (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Securities Available-for-Sale, Amortized Cost    
Due in one year or less $ 23,410  
Due after one year through five years 4,923  
Due after five years through ten years 18,267  
Due after ten years 185,430  
Debt securities excluding securities not due at a single maturity date 232,030  
Total $ 620,435 $ 545,433
Securities Available-for-Sale, Weighted Average Yield    
Due in one year or less (as a percent) 2.39%  
Due after one year through five years (as a percent) 3.10%  
Due after five years through ten years (as a percent) 2.98%  
Due after ten years (as a percent) 3.68%  
Debt securities (as a percent) 3.48%  
Total (as a percent) 2.97%  
Securities Available-for-Sale, Fair Value    
Due in one year or less $ 23,483  
Due after one year through five years 4,912  
Due after five years through ten years 18,089  
Due after ten years 185,563  
Debt securities 232,047  
Fair Value 611,054 531,838
Collateralized mortgage obligations    
Securities Available-for-Sale, Amortized Cost    
Total 110,805 174,352
Securities Available-for-Sale, Fair Value    
Fair Value 108,324 170,927
Asset-backed securities    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date 146,103  
Total $ 146,103 146,391
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 2.23%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 139,886  
Fair Value 139,886 138,407
Collateralized loan obligations    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date 92,564  
Total $ 92,564 102,504
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 3.90%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 92,239  
Fair Value 92,239 $ 101,637
Mortgage-backed and collateralized mortgage obligations    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date $ 149,738  
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 2.32%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 146,882