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Other Borrowed Funds (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Federal Home Loan Bank advances    
Balance at year end $ 494,161 $ 1,026,780
Federal Home Loan Bank advances short-term
    
Federal Home Loan Bank advances    
Balance at year end 487,500 1,020,000
Rate on balance outstanding at year end (as a percent) 0.18% 0.18%
Average daily balance 733,559 656,365
Average rate (as a percent) 0.19% 0.19%
Maximum amount outstanding at any month end 1,235,900 1,307,875
Federal Home Loan Bank advances long-term
    
Federal Home Loan Bank advances    
Balance at year end 6,661 6,780
Rate on balance outstanding at year end (as a percent) 3.51% 3.51%
Average daily balance 6,721 93
Average rate (as a percent) 3.51% 3.51%
Maximum amount outstanding at any month end 6,780 6,780
Amortization of long-term advances for the next five years $ 144  
Period of amortization of long-term advances (in years) 5 years