Derivative Financial Instruments (Balance Sheet Disclosures) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amount	$ 18,198	$ 30,566
Asset Derivative, Fair Value	278	317
Liability Derivative, Notional Amount	47,335	44,175
Liability Derivative, Fair Value	2,521	2,610
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	2,396	2,484
Derivatives not designated as hedging instruments: | Forward Sale Agreements | Other Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amount	12,384	21,925
Asset Derivative, Fair Value	173	168
Derivatives not designated as hedging instruments: | Forward Sale Agreements | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivative, Notional Amount	14,061	10,888
Liability Derivative, Fair Value	67	63
Derivatives not designated as hedging instruments: | Written Interest Rate Options (Locks) | Other Assets
Derivatives, Fair Value [Line Items]
Asset Derivatives, Notional Amount	5,814	8,641
Asset Derivative, Fair Value	105	149
Derivatives not designated as hedging instruments: | Written Interest Rate Options (Locks) | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability Derivative, Notional Amount	3,274	3,287
Liability Derivative, Fair Value	$ 58	$ 63