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Borrowings and Borrowing Capacity - Summary of Customer Repurchase Agreements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
Amount outstanding at end of the year $ 11,488 $ 10,490
Weighted average interest rate at end of the year 0.02% 0.02%
Average daily balance during the year $ 12,906 $ 11,984
Weighted average interest rate during the year 0.02% 0.02%
Maximum month-end balance during the year $ 21,041 $ 15,329