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Securities - Contractural Maturities (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Securities Available-for-Sale, Amortized Cost    
Due in one year or less $ 410  
Due after one year through five years 5,811  
Due after five years through ten years 36,724  
Due after ten years 5,372  
Debt securities excluding securities not due at a single maturity date 48,317  
Total 367,397 376,286
Securities Available-for-Sale, Weighted Average Yield    
Due in one year or less (as a percent) 4.50%  
Due after one year through five years (as a percent) 2.87%  
Due after five years through ten years (as a percent) 2.44%  
Due after ten years (as a percent) 3.31%  
Debt securities (as a percent) 2.61%  
Total (as a percent) 2.37%  
Securities Available-for-Sale, Fair Value    
Due in one year or less 421  
Due after one year through five years 5,992  
Due after five years through ten years 36,218  
Due after ten years 5,199  
Debt securities 47,830  
Fair Value 362,243 372,191
Securities Held-to-Maturity, Amortized Cost    
Amortized Cost 263,040 256,571
Securities Held-to-Maturity, Fair Value    
Fair Value 264,343 254,328
Collateralized mortgage obligations
    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date 29,951  
Total 29,951 66,766
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 2.46%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date 28,417  
Fair Value 28,417 63,876
Securities Held-to-Maturity, Amortized Cost    
Amortized Cost 225,719 221,303
Securities Held-to-Maturity, Fair Value    
Fair Value 225,687 219,088
Asset-backed securities
    
Securities Available-for-Sale, Amortized Cost    
Securities not due at a single maturity date 194,927  
Total 194,927 274,118
Securities Available-for-Sale, Weighted Average Yield    
Securities not due at a single maturity date, Weighted Average Yield (as a percent) 2.10%  
Securities Available-for-Sale, Fair Value    
Securities not due at a single maturity date 192,798  
Fair Value 192,798 273,203
Collateralized mortgage obligation
    
Securities Held-to-Maturity, Amortized Cost    
Amortized Cost 263,040  
Securities Held-to-Maturity, Weighted Average Yield    
Weighted Average Yield (as a percent) 3.05%  
Securities Held-to-Maturity, Fair Value    
Fair Value $ 264,343