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Securities - Contractural Maturities (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Securities Available-for-Sale, Amortized Cost    
Due in one year or less $ 12,136  
Due after one year through five years 6,898  
Due after five years through ten years 33,586  
Due after ten years 3,662  
Debt securities excluding securities not due at a single maturity date 56,282  
Total $ 419,711 $ 391,694
Securities Available-for-Sale, Weighted Average Yield    
Due in one year or less (as a percent) 1.52%  
Due after one year through five years (as a percent) 2.90%  
Due after five years through ten years (as a percent) 2.39%  
Due after ten years (as a percent) 2.82%  
Debt securities (as a percent) 2.29%  
Total (as a percent) 1.77%  
Securities Available-for-Sale, Fair Value    
Due in one year or less $ 12,159  
Due after one year through five years 7,092  
Due after five years through ten years 33,077  
Due after ten years 3,514  
Debt securities 55,842  
Fair Value 408,836 385,486
Securities Held-to-Maturity, Amortized Cost    
Amortized Cost $ 250,044 259,670
Securities Held-to-Maturity, Weighted Average Yield    
Weighted Average Yield (as a percent) 2.98%  
Securities Held-to-Maturity, Fair Value    
Fair Value $ 258,208 263,266
Collateralized mortgage obligations    
Securities Available-for-Sale, Amortized Cost    
Total 72,015 65,728
Securities Available-for-Sale, Fair Value    
Fair Value 70,877 63,627
Securities Held-to-Maturity, Amortized Cost    
Amortized Cost 213,298 222,545
Securities Held-to-Maturity, Fair Value    
Fair Value 219,020 224,111
Asset-backed securities    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date 195,100  
Total $ 195,100 175,565
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 1.26%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 187,096  
Fair Value 187,096 173,496
Collateralized loan obligations    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date 94,265  
Total $ 94,265 94,236
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 2.87%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 92,987  
Fair Value 92,987 $ 92,209
Mortgage-backed and collateralized mortgage obligations    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date $ 74,064  
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 1.30%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date $ 72,911