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Short-Term Borrowings and Long-Term FHLB Advances - Information Concerning Short-term Borrowings (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Long-term Federal Home Loan Bank Advances [Abstract]          
Balance at period-end $ 226,498 $ 180,874 $ 226,498 $ 180,874 $ 237,865
Maximum amount outstanding at any month end 302,932 184,578 302,932 184,578  
Average balance outstanding during the period $ 218,551 $ 182,845 $ 205,046 $ 110,268  
Short-term debt, weighted average interest rate at period end (as a percent) 2.18% 1.17% 2.18% 1.17%  
Short-term debt, weighted average interest rate aid during the period (as a percent) 2.09% 1.19% 1.85% 0.98%