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Borrowings and Borrowing Capacity - Summary of FHLB Advances and Weighted Average Interest Rates by Contractual Maturity (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Debt Disclosure [Abstract]  
2018, Balance Outstanding, Fixed Rate $ 290,000
Total Balance Outstanding, Fixed Rate $ 290,000
2018, Fixed Weighted Average Interest Rate 1.40%
Total Fixed Weighted Average Interest Rate 1.40%
2018, Balance Outstanding, Variable Rate $ 45,000
2027, Balance Outstanding, Variable Rate 30,000
Total Balance Outstanding, Variable Rate $ 75,000
2018, Variable Weighted Average Interest Rate 1.33%
2027, Variable Weighted Average Interest Rate 1.39%
Total Variable Weighted Average Interest Rate 1.35%