Investments in Affordable Housing Limited Partnerships (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Investments in affordable housing limited partnerships, installment period			4 years
Other Assets
Schedule of Equity Method Investments [Line Items]
Investment in affordable housing limited partnerships	$ 17,500		$ 17,500		$ 18,300
Other Liabilities
Schedule of Equity Method Investments [Line Items]
Obligations relating to investments in affordable housing limited partnerships	13,700		13,700		$ 15,000
Other Non-Interest Expense
Schedule of Equity Method Investments [Line Items]
Expense relating to investments in affordable housing limited partnerships	278	$ 376	834	$ 1,128
Income Tax Expense
Schedule of Equity Method Investments [Line Items]
Affordable housing tax credits and other tax benefits	$ 353	$ 551	$ 1,100	$ 1,700