Investments in Affordable Housing Limited Partnerships (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Other Assets
Schedule of Equity Method Investments [Line Items]
Investment in affordable housing limited partnerships	$ 17,700		$ 17,700		$ 18,300
Other Liabilities
Schedule of Equity Method Investments [Line Items]
Obligations relating to investments in affordable housing limited partnerships	14,000		14,000		$ 15,000
Other Non-Interest Expense
Schedule of Equity Method Investments [Line Items]
Expense relating to investments in affordable housing limited partnerships	299	$ 376	556	$ 752
Income Tax Expense
Schedule of Equity Method Investments [Line Items]
Affordable housing tax credits and other tax benefits	$ 348	$ 551	$ 706	$ 1,100