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Commitments and Contingencies - Off Balance Sheet Arrangements (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Total commitments and standby letters of credit
Other Commitments [Line Items]
Total commitments and standby letters of credit	$ 567,514	$ 529,132
Commercial lines of credit
Other Commitments [Line Items]
Total commitments and standby letters of credit	301,107	287,533
Revolving home equity lines
Other Commitments [Line Items]
Total commitments and standby letters of credit	193,364	189,035
Undisbursed construction loans
Other Commitments [Line Items]
Total commitments and standby letters of credit	59,548	41,033
Personal and other lines of credit
Other Commitments [Line Items]
Total commitments and standby letters of credit	10,923	9,567
Standby letters of credit
Other Commitments [Line Items]
Total commitments and standby letters of credit	$ 2,572	$ 1,964