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Off-Balance Sheet Loan Commitments - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Other Noninterest Expense          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Credit loss expense (reversal) for off-balance sheet credit exposure $ (8,000) $ 150,000 $ 3,840,000 $ 116,000  
Other Liabilities          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Allowance for credit losses on off-balance sheet credit exposure $ 6,395,000   $ 6,395,000   $ 638,000