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Short-Term Borrowings (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Average balances and cost of funds of short-term borrowings      
Average Balances $ 356,929 $ 223,090 $ 22,233
Cost of Funds (percent) 0.45% 0.18% 0.17%
Federal Home Loan Bank short-term advances      
Average balances and cost of funds of short-term borrowings      
Average Balances $ 344,724 $ 207,575 $ 17,899
Cost of Funds (percent) 0.46% 0.18% 0.17%
Securities sold under agreements to repurchase      
Average balances and cost of funds of short-term borrowings      
Average Balances $ 12,205 $ 15,515 $ 4,334
Cost of Funds (percent) 0.20% 0.21% 0.15%