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Other Borrowed Funds (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Federal Home Loan Bank advances    
Balance at year end $ 1,223,950 $ 749,027
Federal Home Loan Bank advances short-term
    
Federal Home Loan Bank advances    
Balance at year end 1,215,000 742,500
Rate on balance outstanding at year end (as a percent) 0.17% 0.15%
Average daily balance 833,868 412,919
Average rate (as a percent) 0.16% 0.19%
Maximum amount outstanding at any month end 1,280,500 1,005,500
Federal Home Loan Bank advances long-term
    
Federal Home Loan Bank advances    
Balance at year end 8,950 6,527
Rate on balance outstanding at year end (as a percent) 3.53% 3.51%
Average daily balance 7,289 6,590
Average rate (as a percent) 3.53% 3.51%
Maximum amount outstanding at any month end 8,993 6,650
Amortization of long-term advances for the next five years $ 207,000  
Period of amortization of long-term advances 5 years