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Borrowings and Borrowing Capacity - Summary of Customer Repurchase Agreements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Amount outstanding at end of the year $ 4,485 $ 11,488
Weighted average interest rate at end of the year 0.01% 0.02%
Average daily balance during the year $ 8,648 $ 12,906
Weighted average interest rate during the year 0.02% 0.02%
Maximum month-end balance during the year $ 13,844 $ 21,041