Low Income Housing Tax Credits (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($) housing_equity_fund	Dec. 31, 2014 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of housing equity funds | housing_equity_fund	3
Tax credits and other tax benefits	$ 253	$ 78
Tax credits projected to be received in 2015	316
Other Assets [Member]
Schedule of Equity Method Investments [Line Items]
Investments in housing equity funds	6,180	6,360
Other Liabilities [Member]
Schedule of Equity Method Investments [Line Items]
Additional capital calls expected	$ 6,770	$ 7,000