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Commitments and Contingencies - Off Balance Sheet Arrangements (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Total commitments and standby letters of credit
Other Commitments [Line Items]
Total commitments and standby letters of credit	$ 481,698	$ 491,306
Commercial lines of credit
Other Commitments [Line Items]
Total commitments and standby letters of credit	239,465	238,361
Revolving home equity lines
Other Commitments [Line Items]
Total commitments and standby letters of credit	190,230	189,971
Undisbursed construction loans
Other Commitments [Line Items]
Total commitments and standby letters of credit	40,101	46,229
Personal and other lines of credit
Other Commitments [Line Items]
Total commitments and standby letters of credit	9,888	14,109
Standby letters of credit
Other Commitments [Line Items]
Total commitments and standby letters of credit	$ 2,014	$ 2,636