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Other Borrowed Funds (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Federal Home Loan Bank advances    
Other borrowed funds $ 733,375 $ 505,750
Federal Home Loan Bank advances - short-term    
Federal Home Loan Bank advances    
Other borrowed funds $ 583,375 $ 355,750
Rate on balance outstanding at year end (as a percent) 0.66% 0.37%
Average daily balance $ 483,379 $ 859,220
Average rate (as a percent) 0.47% 0.19%
Maximum amount outstanding at any month end $ 600,875 $ 1,239,200
Federal Home Loan Bank advances - long-term    
Federal Home Loan Bank advances    
Other borrowed funds $ 150,000 $ 150,000
Rate on balance outstanding at year end (as a percent) 0.58% 0.31%
Average daily balance $ 150,000 $ 5,314
Average rate (as a percent) 0.58% 0.31%
Maximum amount outstanding at any month end $ 150,000 $ 150,000