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Short-Term Borrowings - Maturities of Securities Sold under Agreements to Repurchase (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Securities sold under agreements to repurchase    
Weighted-average remaining maturity of agreements 441 days 93 days
Securities sold under agreements to repurchase $ 9,151 $ 216,151
Maturing Over 90 days    
Securities sold under agreements to repurchase    
Securities sold under agreements to repurchase $ 9,151 $ 204,951