Commitments and Contingencies (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Commitments to extend credit: | Home equity
Other Commitments [Line Items]
Contractual obligations	$ 194,818	$ 185,553
Commitments to extend credit: | Commercial real estate
Other Commitments [Line Items]
Contractual obligations	65,071	98,883
Commitments to extend credit: | Other commitments
Other Commitments [Line Items]
Contractual obligations	195,157	203,103
Standby letters of credit
Other Commitments [Line Items]
Contractual obligations	7,240	5,014
Commercial letters of credit
Other Commitments [Line Items]
Contractual obligations	$ 966	$ 1,859