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Securities - Contractural Maturities (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Securities Available-for-Sale, Amortized Cost    
Due in one year or less $ 410  
Due after one year through five years 11,575  
Due after five years through ten years 18,573  
Due after ten years 3,550  
Debt securities excluding securities not due at a single maturity date 34,108  
Total $ 538,539 $ 470,719
Securities Available-for-Sale, Weighted Average Yield    
Due in one year or less (as a percent) 4.60%  
Due after one year through five years (as a percent) 2.31%  
Due after five years through ten years (as a percent) 2.43%  
Due after ten years (as a percent) 2.77%  
Debt securities (as a percent) 2.45%  
Total (as a percent) 2.55%  
Securities Available-for-Sale, Fair Value    
Due in one year or less $ 420  
Due after one year through five years 11,734  
Due after five years through ten years 18,538  
Due after ten years 3,795  
Debt securities 34,487  
Fair Value 531,057 456,066
Securities Held-to-Maturity, Amortized Cost    
Amortized Cost   247,746
Securities Held-to-Maturity, Fair Value    
Fair Value   251,675
Collateralized mortgage obligations    
Securities Available-for-Sale, Amortized Cost    
Total 202,670 68,743
Securities Available-for-Sale, Fair Value    
Fair Value 204,390 66,920
Securities Held-to-Maturity, Amortized Cost    
Amortized Cost   211,241
Securities Held-to-Maturity, Fair Value    
Fair Value   213,578
Asset-backed securities    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date 149,394  
Total $ 149,394 241,872
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 1.95%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 140,173  
Fair Value 140,173 231,908
Collateralized loan obligations    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date 109,468  
Total $ 109,468 94,374
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 3.66%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 108,284  
Fair Value 108,284 $ 92,251
Mortgage-backed and collateralized mortgage obligations    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date $ 245,569  
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 2.43%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 248,113