Fair Value (Details) (USD $)															9 Months Ended		9 Months Ended																																								9 Months Ended				3 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Sep. 30, 2013 Government-sponsored entities debt	Dec. 31, 2012 Government-sponsored entities debt	Sep. 30, 2012 Government-sponsored entities debt	Sep. 30, 2013 State and municipal obligations	Dec. 31, 2012 State and municipal obligations	Sep. 30, 2012 State and municipal obligations	Sep. 30, 2012 FHLMC preferred stock	Sep. 30, 2013 Corporate stocks	Dec. 31, 2012 Corporate stocks	Sep. 30, 2012 Corporate stocks	Sep. 30, 2013 Fair Value	Sep. 30, 2012 Significant Unobservable Inputs (Level 3)	Sep. 30, 2013 Significant Unobservable Inputs (Level 3)	Sep. 30, 2013 Recurring basis	Sep. 30, 2012 Recurring basis	Sep. 30, 2013 Recurring basis Fair Value	Dec. 31, 2012 Recurring basis Fair Value	Sep. 30, 2012 Recurring basis Fair Value	Sep. 30, 2013 Recurring basis Fair Value Government-sponsored entities debt	Dec. 31, 2012 Recurring basis Fair Value Government-sponsored entities debt	Sep. 30, 2012 Recurring basis Fair Value Government-sponsored entities debt	Sep. 30, 2013 Recurring basis Fair Value State and municipal obligations	Dec. 31, 2012 Recurring basis Fair Value State and municipal obligations	Sep. 30, 2012 Recurring basis Fair Value State and municipal obligations	Sep. 30, 2013 Recurring basis Fair Value Mortgage-backed securities	Dec. 31, 2012 Recurring basis Fair Value Mortgage-backed securities	Sep. 30, 2012 Recurring basis Fair Value Mortgage-backed securities	Sep. 30, 2012 Recurring basis Fair Value FHLMC preferred stock	Sep. 30, 2013 Recurring basis Fair Value Corporate stocks	Dec. 31, 2012 Recurring basis Fair Value Corporate stocks	Sep. 30, 2012 Recurring basis Fair Value Corporate stocks	Sep. 30, 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)	Sep. 30, 2012 Recurring basis Quoted Prices In Active Markets for Identical Assets (Level 1)	Sep. 30, 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	Sep. 30, 2012 Recurring basis Quoted Prices In Active Markets for Identical Assets (Level 1) Corporate stocks	Sep. 30, 2013 Recurring basis Significant Other Observable Inputs (Level 2)	Dec. 31, 2012 Recurring basis Significant Other Observable Inputs (Level 2)	Sep. 30, 2012 Recurring basis Significant Other Observable Inputs (Level 2)	Sep. 30, 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	Sep. 30, 2012 Recurring basis Significant Other Observable Inputs (Level 2) Government-sponsored entities debt	Sep. 30, 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	Sep. 30, 2012 Recurring basis Significant Other Observable Inputs (Level 2) State and municipal obligations	Sep. 30, 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	Sep. 30, 2012 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, 2013 Recurring basis Significant Other Observable Inputs (Level 2) Corporate stocks	Dec. 31, 2012 Recurring basis Significant Other Observable Inputs (Level 2) Corporate stocks	Sep. 30, 2012 Recurring basis Significant Other Observable Inputs (Level 2) Corporate stocks	Sep. 30, 2013 Recurring basis Significant Unobservable Inputs (Level 3)	Dec. 31, 2012 Recurring basis Significant Unobservable Inputs (Level 3)	Sep. 30, 2012 Recurring basis Significant Unobservable Inputs (Level 3)	Dec. 31, 2012 Recurring basis Significant Unobservable Inputs (Level 3) State and municipal obligations	Jun. 30, 2013 Private placement bond
Fair Value
Securities paid off by the issuer																																																													$ 3,800,000
Realized gain on the payoff of the security																																																													31,000
Assets
Derivative financial instruments																			209,000	312,000																					209,000	312,000
Securities available for sale	626,798,000	534,883,000	476,023,000	102,673,000	88,518,000	71,545,000	142,578,000	152,799,000	140,033,000	102,000	2,921,000	379,000	373,000						626,798,000	534,883,000	476,023,000	102,673,000	88,518,000	71,545,000	142,578,000	152,799,000	140,033,000	378,626,000	293,187,000	263,970,000	102,000	2,921,000	379,000	373,000	2,696,000	354,000	348,000	2,696,000	354,000	348,000	624,102,000	530,678,000	475,675,000	102,673,000	88,518,000	71,545,000	142,578,000	148,948,000	140,033,000	378,626,000	293,187,000	263,970,000	102,000	225,000	25,000	25,000		3,851,000		3,851,000
Mortgage servicing rights														18,908,000		18,908,000			18,908,000																																						18,908,000
Fair value of Assets, Total																			645,915,000	535,195,000															2,696,000	354,000					624,311,000	530,990,000															18,908,000	3,851,000
Liabilities
Derivative financial instruments																			1,259,000	1,813,000	1,579,000																				1,259,000	1,813,000	1,579,000
Transfers between the fair value hierarchy levels																	0	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
Mortgage and other loan income																																																									(771,000)
Acquired in the First Financial acquisition																																																									19,156,000
Purchases, issuances and settlements, net																																																									(3,851,000)
Transfers in and/or out of level 3															0																																										523,000
Fair value of assets at the end of the period																																																									18,908,000
Unrealized losses included in accumulated other comprehensive income related to Level 3 financial assets and liabilities																																																									$ 0		$ 0