Fair Value (Details) (USD $)													3 Months Ended																																							3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Mar. 31, 2013 Government-sponsored entities debt	Dec. 31, 2012 Government-sponsored entities debt	Mar. 31, 2012 Government-sponsored entities debt	Mar. 31, 2013 State and municipal obligations	Dec. 31, 2012 State and municipal obligations	Mar. 31, 2012 State and municipal obligations	Mar. 31, 2013 Corporate stocks	Dec. 31, 2012 Corporate stocks	Mar. 31, 2012 Corporate stocks	Mar. 31, 2012 Significant Unobservable Inputs (Level 3)	Mar. 31, 2013 Recurring basis	Mar. 31, 2012 Recurring basis	Mar. 31, 2013 Recurring basis Fair Value	Dec. 31, 2012 Recurring basis Fair Value	Mar. 31, 2012 Recurring basis Fair Value	Mar. 31, 2013 Recurring basis Fair Value Government-sponsored entities debt	Dec. 31, 2012 Recurring basis Fair Value Government-sponsored entities debt	Mar. 31, 2012 Recurring basis Fair Value Government-sponsored entities debt	Mar. 31, 2013 Recurring basis Fair Value State and municipal obligations	Dec. 31, 2012 Recurring basis Fair Value State and municipal obligations	Mar. 31, 2012 Recurring basis Fair Value State and municipal obligations	Mar. 31, 2013 Recurring basis Fair Value Mortgage-backed securities	Dec. 31, 2012 Recurring basis Fair Value Mortgage-backed securities	Mar. 31, 2012 Recurring basis Fair Value Mortgage-backed securities	Mar. 31, 2013 Recurring basis Fair Value Corporate stocks	Dec. 31, 2012 Recurring basis Fair Value Corporate stocks	Mar. 31, 2012 Recurring basis Fair Value Corporate stocks	Mar. 31, 2013 Recurring basis Quoted Prices In Active Markets for Identical Assets (Level 1)	Dec. 31, 2012 Recurring basis Quoted Prices In Active Markets for Identical Assets (Level 1)	Mar. 31, 2012 Recurring basis Quoted Prices In Active Markets for Identical Assets (Level 1)	Mar. 31, 2013 Recurring basis Quoted Prices In Active Markets for Identical Assets (Level 1) Corporate stocks	Dec. 31, 2012 Recurring basis Quoted Prices In Active Markets for Identical Assets (Level 1) Corporate stocks	Mar. 31, 2012 Recurring basis Quoted Prices In Active Markets for Identical Assets (Level 1) Corporate stocks	Mar. 31, 2013 Recurring basis Significant Other Observable Inputs (Level 2)	Dec. 31, 2012 Recurring basis Significant Other Observable Inputs (Level 2)	Mar. 31, 2012 Recurring basis Significant Other Observable Inputs (Level 2)	Mar. 31, 2013 Recurring basis Significant Other Observable Inputs (Level 2) Government-sponsored entities debt	Dec. 31, 2012 Recurring basis Significant Other Observable Inputs (Level 2) Government-sponsored entities debt	Mar. 31, 2012 Recurring basis Significant Other Observable Inputs (Level 2) Government-sponsored entities debt	Mar. 31, 2013 Recurring basis Significant Other Observable Inputs (Level 2) State and municipal obligations	Dec. 31, 2012 Recurring basis Significant Other Observable Inputs (Level 2) State and municipal obligations	Mar. 31, 2012 Recurring basis Significant Other Observable Inputs (Level 2) State and municipal obligations	Mar. 31, 2013 Recurring basis Significant Other Observable Inputs (Level 2) Mortgage-backed securities	Dec. 31, 2012 Recurring basis Significant Other Observable Inputs (Level 2) Mortgage-backed securities	Mar. 31, 2012 Recurring basis Significant Other Observable Inputs (Level 2) Mortgage-backed securities	Mar. 31, 2013 Recurring basis Significant Other Observable Inputs (Level 2) Corporate stocks	Dec. 31, 2012 Recurring basis Significant Other Observable Inputs (Level 2) Corporate stocks	Mar. 31, 2012 Recurring basis Significant Other Observable Inputs (Level 2) Corporate stocks	Mar. 31, 2013 Recurring basis Significant Unobservable Inputs (Level 3)	Dec. 31, 2012 Recurring basis Significant Unobservable Inputs (Level 3)	Mar. 31, 2012 Recurring basis Significant Unobservable Inputs (Level 3)	Mar. 31, 2013 Recurring basis Significant Unobservable Inputs (Level 3) State and municipal obligations	Dec. 31, 2012 Recurring basis Significant Unobservable Inputs (Level 3) State and municipal obligations
Assets
Derivative financial instruments																$ 290,000	$ 312,000																				$ 290,000	$ 312,000
Securities available for sale	510,852,000	534,883,000	322,588,000	71,802,000	88,518,000	66,378,000	148,896,000	152,799,000	42,008,000	412,000	379,000	393,000				510,852,000	534,883,000	322,588,000	71,802,000	88,518,000	66,378,000	148,897,000	152,799,000	42,008,000	289,741,000	293,187,000	213,809,000	412,000	379,000	393,000	387,000	354,000	368,000	387,000	354,000	368,000	506,651,000	530,678,000	322,220,000	71,802,000	88,518,000	66,378,000	145,083,000	148,948,000	42,008,000	289,741,000	293,187,000	213,809,000	25,000	25,000	25,000	3,814,000	3,851,000		3,814,000	3,851,000
Fair value of Assets, Total																511,142,000	535,195,000														387,000	354,000					506,941,000	530,990,000														3,814,000	3,851,000
Liabilities
Derivative financial instruments																1,692,000	1,813,000	1,280,000																			1,692,000	1,813,000	1,280,000
Transfers between the fair value hierarchy levels														0	0
Changes in hierarchy classifications of Level 3 assets													0
Changes in hierarchy classifications of Level 3 liabilities													0
Changes in fair value of assets
Fair value of assets at the beginning of the period																																																				3,851,000
Purchases, issuances and settlements, net																																																				(37,000)
Fair value of assets at the end of the period																																																				3,814,000
Unrealized losses included in accumulated other comprehensive income related to Level 3 financial assets and liabilities																																																				$ 0		$ 0