Derivatives and Hedging Activities (Derivative Financial Instruments included in OCI and Current Earnings) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Gain in OCI on derivatives (effective portion), net of tax	$ 149		$ (411)	$ (315)		$ 350
Loss reclassified from OCI into noninterest expense (loss on termination)		[1]		1,121	[1]
Derivatives designated as hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain in OCI on derivatives (effective portion), net of tax	578		455	2,085		2,907
Loss reclassified from OCI into interest expense (effective portion)	726		1,464	2,937		4,322
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Changes in fair value of customer related positions	51		(1,127)	94		166
Interest Expense [Member] | Derivatives designated as hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net
Other income | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Changes in fair value of customer related positions	10		1	54		27
Other expense | Derivatives designated as hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net
Other expense | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Changes in fair value of customer related positions	(1)		(27)	(3)		(108)
Mortgage banking income | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Changes in fair value of mortgage derivatives	$ 42		$ (1,101)	$ 43		$ 247

[1] cludes the amortization of the remaining balance of a realized but unrecognized gain, net of tax, from the termination of interest rate swaps in June 2009. The original gain of $1.4 million, net of tax, is being recognized in earnings through December 2018, the original maturity date of the swap. The balance of this gain has amortized to $606,000 and $751,000 at September 30, 2014 and 2013, respectively.