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Investment Securities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Available-for-sale Securities [Abstract]      
Amortized cost $ 471,542 $ 558,818 [1]  
Gross unrealized gains 2,852 7,451  
Gross unrealized losses 20,984 1,419  
Estimated fair value 453,410 564,850 [1]  
Held-to-maturity Securities [Abstract]      
Amortized cost 154,797    
Gross unrealized gains 0    
Gross unrealized losses 6,052    
Estimated fair value 148,745    
Amortized cost, Total 626,339    
Gross unrealized gains, Total 2,852    
Gross unrealized losses, Total 27,036    
Estimated fair value, Total 602,155    
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 2,063 22,118  
Gross unrealized gains 21 55  
Gross unrealized losses 0 0  
Estimated fair value 2,084 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 386,628 436,344  
Gross unrealized gains 1,013 5,678  
Gross unrealized losses 18,658 948  
Estimated fair value 368,983 441,074  
Held-to-maturity Securities [Abstract]      
Amortized cost 144,723    
Gross unrealized gains 0    
Gross unrealized losses 5,324    
Estimated fair value 139,399    
Residential mortgage-backed securities - Private [Member]
     
Available-for-sale Securities [Abstract]      
Amortized cost 21,220 22,649  
Gross unrealized gains 1,614 750  
Gross unrealized losses 10 454  
Estimated fair value 22,824 22,945  
Commercial mortgage-backed securities - GSE [Member]
     
Available-for-sale Securities [Abstract]      
Amortized cost 22,959 23,150  
Gross unrealized gains 0 209  
Gross unrealized losses 1,461 0  
Estimated fair value 21,498 23,359  
Commercial mortgage-backed securities - Private [Member]
     
Available-for-sale Securities [Abstract]      
Amortized cost   5,283 10,430
Gross unrealized gains   34 0
Gross unrealized losses   0 855
Estimated fair value   5,317 9,575
Held-to-maturity Securities [Abstract]      
Amortized cost 10,074    
Gross unrealized gains 0    
Gross unrealized losses 728    
Estimated fair value 9,346    
Corporate notes [Member]
     
Available-for-sale Securities [Abstract]      
Amortized cost 28,242 36,710  
Gross unrealized gains 204 270  
Gross unrealized losses 0 17  
Estimated fair value $ 28,446 $ 36,963  
[1] Derived from audited consolidated financial statements