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Borrowings and Borrowing Capacity - Summary of Information Concerning FHLB Advances (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Amount outstanding at end of the year $ 330,000,000 $ 365,000,000
Weighted average interest rate at end of the year 2.52% 1.39%
Average daily balance during the year $ 345,388,000 $ 300,451,000
Weighted average interest rate during the year 1.96% 1.05%
Maximum month-end balance during the year $ 455,000,000 $ 385,000,000