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Commitments and Contingencies - Off Balance Sheet Arrangements (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Total commitments and standby letters of credit
Other Commitments [Line Items]
Total commitments and standby letters of credit	$ 610,754	$ 529,132
Commercial lines of credit
Other Commitments [Line Items]
Total commitments and standby letters of credit	309,469	287,533
Revolving home equity lines
Other Commitments [Line Items]
Total commitments and standby letters of credit	199,332	189,035
Undisbursed construction loans
Other Commitments [Line Items]
Total commitments and standby letters of credit	89,605	41,033
Personal and other lines of credit
Other Commitments [Line Items]
Total commitments and standby letters of credit	10,431	9,567
Standby letters of credit
Other Commitments [Line Items]
Total commitments and standby letters of credit	$ 1,917	$ 1,964