Derivatives and Hedging Activities (Gains and Losses Recognized) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Gains and losses recognized in income on derivatives	$ 834	$ (1,693)
Mortgage loan commitments | Other income
Derivative Instruments, Gain (Loss) [Line Items]
Gains and losses recognized in income on derivatives	92	(1,020)
Forward sales contracts | Other income
Derivative Instruments, Gain (Loss) [Line Items]
Gains and losses recognized in income on derivatives	(77)	204
Credit Risk Contract | Other income
Derivative Instruments, Gain (Loss) [Line Items]
Gains and losses recognized in income on derivatives	819	(877)
Other Credit Derivatives | Other Expenses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains and losses recognized in income on derivatives	$ 0	$ 0