Derivatives and Hedging Activities (Gains and Losses Recognized) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Gains and losses recognized in income on derivatives	$ (1,180)	$ (701)	$ (2,580)	$ 76
Mortgage loan commitments | Other income
Derivative Instruments, Gain (Loss) [Line Items]
Gains and losses recognized in income on derivatives	(63)	(516)	(1,129)	1,084
Forward sales contracts | Other income
Derivative Instruments, Gain (Loss) [Line Items]
Gains and losses recognized in income on derivatives	(181)	454	197	(476)
Credit Risk Contract | Other income
Derivative Instruments, Gain (Loss) [Line Items]
Gains and losses recognized in income on derivatives	(936)	(124)	(1,648)	(17)
Other Credit Derivatives | Other Expenses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains and losses recognized in income on derivatives	$ 0	$ (515)	$ 0	$ (515)