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Investment Securities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Available-for-sale Securities [Abstract]    
Amortized cost $ 493,631 $ 558,818 [1]
Gross unrealized gains 2,951 7,451
Gross unrealized losses 4,227 1,419
Estimated fair value 492,355 564,850 [1]
Held-to-maturity Securities [Abstract]    
Estimated fair value 73,245  
Amortized cost, Total 567,146  
Gross unrealized gains, Total 2,952  
Gross unrealized losses, Total 4,498  
Estimated fair value, Total 565,600  
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 2,069 22,118
Gross unrealized gains 38 55
Gross unrealized losses 0 0
Estimated fair value 2,107 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 409,949 436,344
Gross unrealized gains 1,794 5,678
Gross unrealized losses 3,279 948
Estimated fair value 408,464 441,074
Held-to-maturity Securities [Abstract]    
Amortized cost 73,515  
Gross unrealized gains 1  
Gross unrealized losses 271  
Estimated fair value 73,245  
Residential mortgage-backed securities - private [Member]
   
Available-for-sale Securities [Abstract]    
Amortized cost 21,992 22,649
Gross unrealized gains 879 750
Gross unrealized losses 250 454
Estimated fair value 22,621 22,945
Commercial mortgage-backed securities - GSE [Member]
   
Available-for-sale Securities [Abstract]    
Amortized cost 23,054 23,150
Gross unrealized gains 0 209
Gross unrealized losses 658 0
Estimated fair value 22,396 23,359
Commercial mortgage-backed securities - private [Member]
   
Available-for-sale Securities [Abstract]    
Amortized cost   5,283
Gross unrealized gains   34
Gross unrealized losses   0
Estimated fair value   5,317
Corporate notes [Member]
   
Available-for-sale Securities [Abstract]    
Amortized cost 36,567 36,710
Gross unrealized gains 240 270
Gross unrealized losses 40 17
Estimated fair value $ 36,767 $ 36,963
[1] Derived from audited consolidated financial statements