Derivatives and Hedging Activities (Gains and Losses Recognized) (Details) (Not Designated as Hedging Instrument, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Gains and losses recognized in income on derivatives	$ (1,693)	$ 247
Mortgage loan commitments | Other income
Derivative Instruments, Gain (Loss) [Line Items]
Gains and losses recognized in income on derivatives	(1,020)	684
Forward sales contracts | Other income
Derivative Instruments, Gain (Loss) [Line Items]
Gains and losses recognized in income on derivatives	204	(216)
Credit Risk Contract | Other income
Derivative Instruments, Gain (Loss) [Line Items]
Gains and losses recognized in income on derivatives	(877)	(221)
Other Credit Derivatives | Other Expenses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains and losses recognized in income on derivatives	$ 0	$ 0