Commitments and Contingent Liabilities - Loan Commitments and Standby letters of credit (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Standby Letters of Credit
Commitments and Contingent Liabilities
Face amount of asset	$ 17,180	$ 16,600
Loan commitments
Commitments and Contingent Liabilities
Face amount of asset	$ 303,920	$ 256,150

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