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Borrowings and Borrowing Capacity - Summary of Information Concerning FHLB Advances (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
Amount outstanding at end of the year $ 365,000,000 $ 230,000,000
Weighted average interest rate at end of the year 1.39% 0.58%
Average daily balance during the year $ 300,451,000 $ 174,784,000
Weighted average interest rate during the year 1.05% 0.41%
Maximum month-end balance during the year $ 385,000,000 $ 291,000,000