Investments in Affordable Housing Limited Partnerships (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Investments in affordable housing limited partnerships, installment period	3 years
Other Non-Interest Expense
Schedule of Equity Method Investments [Line Items]
Expense relating to investments in affordable housing limited partnerships	$ 352	$ 257
Income Tax Expense
Schedule of Equity Method Investments [Line Items]
Affordable housing tax credits and other tax benefits	390	$ 358
Other Assets
Schedule of Equity Method Investments [Line Items]
Investment in affordable housing limited partnerships	16,800		$ 17,200
Other Liabilities
Schedule of Equity Method Investments [Line Items]
Obligations relating to investments in affordable housing limited partnerships	$ 12,800		$ 12,900