Derivative Financial Instruments (Balance Sheet Disclosures) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amount	$ 48,976	$ 26,445
Asset Derivative, Fair Value	862	269
Liability Derivative, Notional Amount	85,906	52,308
Liability Derivative, Fair Value	3,154	2,125
Derivatives designated in cash flow hedging relationships | Interest rate swap | Other Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amount	0	0
Asset Derivative, Fair Value	0	0
Derivatives designated in cash flow hedging relationships | Interest rate swap | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivative, Notional Amount	30,000	30,000
Liability Derivative, Fair Value	2,653	1,834
Derivatives not designated as hedging instruments: | Forward Sale Agreements | Other Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amount	18,184	22,220
Asset Derivative, Fair Value	106	135
Derivatives not designated as hedging instruments: | Forward Sale Agreements | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivative, Notional Amount	46,010	15,287
Liability Derivative, Fair Value	410	124
Derivatives not designated as hedging instruments: | Written Interest Rate Options (Locks) | Other Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amount	30,792	4,225
Asset Derivative, Fair Value	756	134
Derivatives not designated as hedging instruments: | Written Interest Rate Options (Locks) | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivative, Notional Amount	9,896	7,021
Liability Derivative, Fair Value	$ 91	$ 167