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Long-term Debt - Additional Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Long-term Federal Home Loan Bank advances, total $ 0 $ 0
Federal Home Loan Bank, advances, general debt obligations, disclosures, collateral pledged 29,600 27,000
Federal Home Loan Bank, advances, general debt obligations, amount of available, unused funds $ 233,000 $ 282,200