Commitments and Contingencies - Contractual Amounts (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Contractual amount of off-balance-sheet financial instruments
Total contractual amount of off-balance-sheet financial instruments	$ 425,569	$ 342,086
Commitments to extend credit
Contractual amount of off-balance-sheet financial instruments
Total contractual amount of off-balance-sheet financial instruments	269,172	240,758
Commitments to originate residential first and second mortgage loans
Contractual amount of off-balance-sheet financial instruments
Total contractual amount of off-balance-sheet financial instruments	60,820	3,980
Standby letters of credit
Contractual amount of off-balance-sheet financial instruments
Total contractual amount of off-balance-sheet financial instruments	$ 95,577	$ 97,348