Low Income Housing Tax Credits (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) housing_equity_fund	Dec. 31, 2015 USD ($) housing_equity_fund	Dec. 31, 2014 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of housing equity funds | housing_equity_fund	4	4
Tax credits and other tax benefits	$ 408	$ 120	$ 211
Tax credits projected to be received	441
Other Assets [Member]
Schedule of Equity Method Investments [Line Items]
Investments in housing equity funds	8,400	9,000
Other Liabilities [Member]
Schedule of Equity Method Investments [Line Items]
Additional capital calls expected	$ 8,200	$ 9,300