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Other Borrowed Funds (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Federal Home Loan Bank advances    
Balance at year end $ 749,027 $ 494,161
Federal Home Loan Bank advances short-term
    
Federal Home Loan Bank advances    
Balance at year end 742,500 487,500
Rate on balance outstanding at year end (as a percent) 0.15% 0.18%
Average daily balance 412,919 733,559
Average rate (as a percent) 0.19% 0.19%
Maximum amount outstanding at any month end 1,005,500 1,235,900
Federal Home Loan Bank advances long-term
    
Federal Home Loan Bank advances    
Balance at year end 6,527 6,661
Rate on balance outstanding at year end (as a percent) 3.51% 3.51%
Average daily balance 6,590 6,721
Average rate (as a percent) 3.51% 3.51%
Maximum amount outstanding at any month end 6,650 6,780
Amortization of long-term advances for the next five years $ 149  
Period of amortization of long-term advances 5 years