Fair Value (Details) (USD $) In Thousands, unless otherwise specified																																																				9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Sep. 30, 2012 Government-sponsored entities debt	Dec. 31, 2011 Government-sponsored entities debt	Sep. 30, 2011 Government-sponsored entities debt	Sep. 30, 2012 State and municipal obligations	Dec. 31, 2011 State and municipal obligations	Sep. 30, 2011 State and municipal obligations	Sep. 30, 2012 FHLMC preferred stock	Sep. 30, 2012 Corporate stocks	Dec. 31, 2011 Corporate stocks	Sep. 30, 2011 Corporate stocks	Sep. 30, 2012 Recurring basis Fair Value	Dec. 31, 2011 Recurring basis Fair Value	Sep. 30, 2011 Recurring basis Fair Value	Sep. 30, 2012 Recurring basis Fair Value Government-sponsored entities debt	Dec. 31, 2011 Recurring basis Fair Value Government-sponsored entities debt	Sep. 30, 2011 Recurring basis Fair Value Government-sponsored entities debt	Sep. 30, 2012 Recurring basis Fair Value State and municipal obligations	Dec. 31, 2011 Recurring basis Fair Value State and municipal obligations	Sep. 30, 2011 Recurring basis Fair Value State and municipal obligations	Sep. 30, 2012 Recurring basis Fair Value Mortgage-backed securities	Dec. 31, 2011 Recurring basis Fair Value Mortgage-backed securities	Sep. 30, 2011 Recurring basis Fair Value Mortgage-backed securities	Sep. 30, 2012 Recurring basis Fair Value FHLMC preferred stock	Sep. 30, 2012 Recurring basis Fair Value Corporate stocks	Dec. 31, 2011 Recurring basis Fair Value Corporate stocks	Sep. 30, 2011 Recurring basis Fair Value Corporate stocks	Sep. 30, 2012 Recurring basis Quoted Prices In Active Markets for Identical Assets (Level 1)	Dec. 31, 2011 Recurring basis Quoted Prices In Active Markets for Identical Assets (Level 1)	Sep. 30, 2011 Recurring basis Quoted Prices In Active Markets for Identical Assets (Level 1)	Sep. 30, 2012 Recurring basis Quoted Prices In Active Markets for Identical Assets (Level 1) Corporate stocks	Dec. 31, 2011 Recurring basis Quoted Prices In Active Markets for Identical Assets (Level 1) Corporate stocks	Sep. 30, 2011 Recurring basis Quoted Prices In Active Markets for Identical Assets (Level 1) Corporate stocks	Sep. 30, 2012 Recurring basis Significant Other Observable Inputs (Level 2)	Dec. 31, 2011 Recurring basis Significant Other Observable Inputs (Level 2)	Sep. 30, 2011 Recurring basis Significant Other Observable Inputs (Level 2)	Sep. 30, 2012 Recurring basis Significant Other Observable Inputs (Level 2) Government-sponsored entities debt	Dec. 31, 2011 Recurring basis Significant Other Observable Inputs (Level 2) Government-sponsored entities debt	Sep. 30, 2011 Recurring basis Significant Other Observable Inputs (Level 2) Government-sponsored entities debt	Sep. 30, 2012 Recurring basis Significant Other Observable Inputs (Level 2) State and municipal obligations	Dec. 31, 2011 Recurring basis Significant Other Observable Inputs (Level 2) State and municipal obligations	Sep. 30, 2011 Recurring basis Significant Other Observable Inputs (Level 2) State and municipal obligations	Sep. 30, 2012 Recurring basis Significant Other Observable Inputs (Level 2) Mortgage-backed securities	Dec. 31, 2011 Recurring basis Significant Other Observable Inputs (Level 2) Mortgage-backed securities	Sep. 30, 2011 Recurring basis Significant Other Observable Inputs (Level 2) Mortgage-backed securities	Sep. 30, 2012 Recurring basis Significant Other Observable Inputs (Level 2) FHLMC preferred stock	Sep. 30, 2012 Recurring basis Significant Other Observable Inputs (Level 2) Corporate stocks	Dec. 31, 2011 Recurring basis Significant Other Observable Inputs (Level 2) Corporate stocks	Sep. 30, 2011 Recurring basis Significant Other Observable Inputs (Level 2) Corporate stocks	Sep. 30, 2011 Recurring basis Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	$ 476,023	$ 289,195	$ 281,926	$ 71,545	$ 49,603	$ 61,320	$ 140,033	$ 43,957	$ 43,448	$ 102	$ 373	$ 326	$ 303	$ 476,023	$ 289,195	$ 281,926	$ 71,545	$ 49,603	$ 61,320	$ 140,033	$ 43,957	$ 43,448	$ 263,970	$ 195,309	$ 176,855	$ 102	$ 373	$ 326	$ 303	$ 348	$ 301	$ 278	$ 348	$ 301	$ 278	$ 475,675	$ 288,894	$ 281,648	$ 71,545	$ 49,603	$ 61,320	$ 140,033	$ 43,957	$ 43,448	$ 263,970	$ 195,309	$ 176,855	$ 102	$ 25	$ 25	$ 25
Liabilities
Derivative financial instruments														1,579	1,391	1,377																				1,579	1,391	1,377
Changes in fair value of assets
Fair value of assets at the beginning of the period																																																				2,034
Change in unrealized loss recognized in other comprehensive income																																																				95
Purchases, issuances and settlements, net																																																				$ (2,129)