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Borrowings Repurchase Agreements and Other Borrowings (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Short-term Debt [Line Items]      
Securities Sold Under Agreements to Repurchase Weighted Average Rate 0.05%    
Securities Sold under Agreements to Repurchase $ 185,763 $ 128,842  
Securities Sold under Agreements to Repurchase Increase (Decrease) 56,900    
Securities Sold under Agreements to Repurchase [Member]      
Short-term Debt [Line Items]      
Maximum outstanding at any month-end 185,763 128,842 $ 121,869
Average amount outstanding for the year $ 129,734 $ 113,748 $ 97,478