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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, 2018
USD ($)
Debt Disclosure [Abstract]  
2019, Balance Outstanding, Fixed Rate $ 300,000
Total Balance Outstanding, Fixed Rate $ 300,000
2019, Fixed Weighted Average Interest Rate 2.52%
Total Fixed Weighted Average Interest Rate 2.52%
2027, Balance Outstanding, Variable Rate $ 30,000
Total Balance Outstanding, Variable Rate $ 30,000
2027, Variable Weighted Average Interest Rate 2.55%
Total Variable Weighted Average Interest Rate 2.55%