Outstanding Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Credit Commitments and Contingencies
Adoption of CECL, reserve for unfunded commitments	$ 6,500	$ 5,500
Adoption of CECL, additional provision	1,000
Commitments to extend credit
Credit Commitments and Contingencies
Financial instruments whose contract amounts represent credit risk:	1,628,461		$ 1,649,565
Standby letters of credit
Credit Commitments and Contingencies
Financial instruments whose contract amounts represent credit risk:	$ 42,774		$ 42,581