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Derivative Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative in fair value hedging relationship [Member]
Effect of the derivative instruments on the consolidated statement of income Derivative in fair value hedging relationship
Location of gain (loss) recognized on derivative
Interest Rate Contracts One [Member] \| Derivative in fair value hedging relationship [Member] \| Interest income - loans [Member]
Effect of the derivative instruments on the consolidated statement of income Derivative in fair value hedging relationship
Location of gain (loss) recognized on derivative	(401)	(74)
Interest Rate Contracts Two [Member] \| Derivative in fair value hedging relationship [Member] \| Interest income - loans [Member]
Effect of the derivative instruments on the consolidated statement of income Derivative in fair value hedging relationship
Location of gain (loss) recognized on derivative	401	74
Derivatives not designated as hedging instruments [Member] \| Mortgage contracts [Member] \| Other income - gain on sale of loans [Member]
Effect of the derivative instruments on the consolidated statement of income Derivative in fair value hedging relationship
Location of gain (loss) recognized on derivative	$ (12)	$ (223)