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Investment Securities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Available-for-sale Securities [Abstract]    
Amortized cost $ 456,310 $ 558,818 [1]
Gross unrealized gains 2,775 7,451
Gross unrealized losses 19,373 1,419
Estimated fair value 439,712 564,850 [1]
Held-to-maturity Securities [Abstract]    
Amortized cost 153,684  
Gross unrealized gains 0  
Gross unrealized losses 7,210  
Estimated fair value 146,474  
Amortized cost, Total 609,994  
Gross unrealized gains, Total 2,775  
Gross unrealized losses, Total 26,583  
Estimated fair value, Total 586,186  
Obligations of U.S. Treasury and government agencies [Member]
   
Available-for-sale Securities [Abstract]    
Amortized cost   6,646
Gross unrealized gains   335
Gross unrealized losses   0
Estimated fair value   6,981
Obligations of U.S. government sponsored enterprises [Member]
   
Available-for-sale Securities [Abstract]    
Amortized cost 2,057 22,118
Gross unrealized gains 25 55
Gross unrealized losses 0 0
Estimated fair value 2,082 22,173
Obligations of states and political subdivisions [Member]
   
Available-for-sale Securities [Abstract]    
Amortized cost   5,918
Gross unrealized gains   120
Gross unrealized losses   0
Estimated fair value   6,038
Residential mortgage-backed securities - GSE [Member]
   
Available-for-sale Securities [Abstract]    
Amortized cost 373,860 436,344
Gross unrealized gains 945 5,678
Gross unrealized losses 17,358 948
Estimated fair value 357,447 441,074
Held-to-maturity Securities [Abstract]    
Amortized cost 143,611  
Gross unrealized gains 0  
Gross unrealized losses 6,556  
Estimated fair value 137,055  
Residential mortgage-backed securities - Private [Member]
   
Available-for-sale Securities [Abstract]    
Amortized cost 20,484 22,649
Gross unrealized gains 784 750
Gross unrealized losses 10 454
Estimated fair value 21,258 22,945
Commercial mortgage-backed securities - GSE [Member]
   
Available-for-sale Securities [Abstract]    
Amortized cost 22,863 23,150
Gross unrealized gains 0 209
Gross unrealized losses 1,219 0
Estimated fair value 21,644 23,359
Commercial mortgage-backed securities - Private [Member]
   
Available-for-sale Securities [Abstract]    
Amortized cost 10,419 5,283
Gross unrealized gains 0 34
Gross unrealized losses 786 0
Estimated fair value 9,633 5,317
Held-to-maturity Securities [Abstract]    
Amortized cost 10,073  
Gross unrealized gains 0  
Gross unrealized losses 654  
Estimated fair value 9,419  
Business Development Company investment [Member]
   
Available-for-sale Securities [Abstract]    
Amortized cost 1,753  
Gross unrealized gains 887  
Gross unrealized losses 0  
Estimated fair value 2,640  
Corporate notes [Member]
   
Available-for-sale Securities [Abstract]    
Amortized cost 24,874 36,710
Gross unrealized gains 134 270
Gross unrealized losses 0 17
Estimated fair value $ 25,008 $ 36,963
[1] Derived from audited consolidated financial statements