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Commitments and Contingencies - Off Balance Sheet Arrangements (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Total commitments and standby letters of credit
Other Commitments [Line Items]
Total commitments and standby letters of credit	$ 483,027	$ 491,306
Commercial lines of credit
Other Commitments [Line Items]
Total commitments and standby letters of credit	234,953	238,361
Revolving home equity lines
Other Commitments [Line Items]
Total commitments and standby letters of credit	187,244	189,971
Undisbursed construction loans
Other Commitments [Line Items]
Total commitments and standby letters of credit	49,037	46,229
Personal and other lines of credit
Other Commitments [Line Items]
Total commitments and standby letters of credit	9,779	14,109
Standby letters of credit
Other Commitments [Line Items]
Total commitments and standby letters of credit	$ 2,014	$ 2,636