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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

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