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Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Financial Instruments with Off-Balance Sheet Risk          
Credit loss $ 9,031 $ 2,263 $ 9,031 $ 2,263 $ 9,031
Changes in the allowance for credit losses for loans with off-balance sheet credit exposures          
Balance, beginning of period 7,209 2,255 2,075 2,366  
Transition adjustment CECL accounting standard     3,837    
Expense (reversal of expense) 1,822 8 3,119 (103)  
Balance, end of period $ 9,031 $ 2,263 9,031 $ 2,263  
ASU 2016-13          
Financial Instruments with Off-Balance Sheet Risk          
Credit loss     5,900    
Changes in the allowance for credit losses for loans with off-balance sheet credit exposures          
Balance, beginning of period     $ 5,900    
Unused commitments to extend credit          
Financial Instruments with Off-Balance Sheet Risk          
Outstanding commitments         2,000,000
Standby letters of credit          
Financial Instruments with Off-Balance Sheet Risk          
Outstanding commitments         $ 90,300