Derivative Instruments (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Derivative [Line Items]
Cash flow hedge gain (loss) to be reclassified within 12 months	$ 447,000
Remaining unamortized deferred gain (loss) balance of all previously terminated cash flow hedges	(1,500,000)		(1,600,000)
Remaining deferred gain (loss) balance on all previously terminated fair value hedges	9,900,000		10,700,000
Gain (loss) on sale of outstanding commitments	(969,000)	(140,000)
Deferred gains (loss) on discontinuation of cash flow hedge reclassified to earnings	774,000	914,000
Fixed Rate Residential Mortgage [Member]
Derivative [Line Items]
Commitments to fund fixed-rate mortgage loans	88,000,000		65,000,000
Unrealized gain on fair value of fixed-rate mortgage loans to customers	649,000	51,000
Sale of outstanding commitments	107,000,000		92,000,000
Interest Rate Swap [Member] | Customer Related Interest Rate Risk [Member]
Derivative [Line Items]
Notional amount of interest rate swap contracts	1,140,000,000		38,500,000
Federal Funds Sold [Member]
Derivative [Line Items]
Federal funds sold	72,400,000
Federal Funds Sold, Counterparty with CCC [Member]
Derivative [Line Items]
Federal funds sold	$ 3,300,000