Commitments and Contingent Liabilities - Loan Commitments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Standby Letters of Credit
Commitments and Contingent Liabilities
Face amount of asset	$ 19,560	$ 19,340
Loan Commitments
Commitments and Contingent Liabilities
Face amount of asset	$ 253,980	$ 244,170

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