Investments in Affordable Housing Limited Partnerships (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 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	$ 353	$ 299	$ 705	$ 556
Income Tax Expense
Schedule of Equity Method Investments [Line Items]
Affordable housing tax credits and other tax benefits	483	$ 348	873	$ 706
Other Assets
Schedule of Equity Method Investments [Line Items]
Investment in affordable housing limited partnerships	16,500		16,500		$ 17,200
Other Liabilities
Schedule of Equity Method Investments [Line Items]
Obligations relating to investments in affordable housing limited partnerships	$ 12,800		$ 12,800		$ 12,900