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Fair Market Value of Financial Assets and Liabilities (Details) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended										6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Recurring [Member] Marketable Equity Securities [Member]	Jun. 30, 2012 Recurring [Member] Marketable Equity Securities [Member]	Jun. 30, 2013 Recurring [Member] Marketable Equity Securities [Member]	Jun. 30, 2012 Recurring [Member] Marketable Equity Securities [Member]	Jun. 30, 2013 Recurring [Member] Mortgage Servicing Rights [Member]	Jun. 30, 2012 Recurring [Member] Mortgage Servicing Rights [Member]	Jun. 30, 2013 Recurring [Member] Mortgage Servicing Rights [Member]	Jun. 30, 2012 Recurring [Member] Mortgage Servicing Rights [Member]	Jun. 30, 2013 Recurring [Member] Fair Value [Member]	Dec. 31, 2012 Recurring [Member] Fair Value [Member]	Jun. 30, 2013 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	Dec. 31, 2012 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	Jun. 30, 2013 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2012 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Jun. 30, 2013 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2012 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Jun. 30, 2013 Nonrecurring [Member]	Jun. 30, 2012 Nonrecurring [Member]	Dec. 31, 2012 Nonrecurring [Member]	Jun. 30, 2013 Nonrecurring [Member] Fair Value [Member]	Dec. 31, 2012 Nonrecurring [Member] Fair Value [Member]	Jun. 30, 2013 Nonrecurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	Dec. 31, 2012 Nonrecurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	Jun. 30, 2013 Nonrecurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2012 Nonrecurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Jun. 30, 2013 Nonrecurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2012 Nonrecurring [Member] Significant Unobservable Inputs (Level 3) [Member]
Available-for-sale securities [Abstract]
U.S. Treasury and government agencies													$ 67,608,000	$ 60,915,000	$ 0	$ 0	$ 67,608,000	$ 60,915,000	$ 0	$ 0
State and political subdivisions													115,942,000	113,221,000	0	0	115,942,000	113,221,000	0	0
U.S. government sponsored agency mortgage-backed securities													450,336,000	383,581,000	0	0	450,336,000	383,581,000	0	0
Marketable equity securities													53,476,000	45,626,000	53,476,000	45,626,000	0	0	0	0
Mortgage servicing rights													3,222,000	2,364,000	0	0	0	0	3,222,000	2,364,000
Assets measured-nonrecurring basis [Abstract]
Impaired loans (collateral dependent)																								5,419,000	5,465,000	0	0	0	0	5,419,000	5,465,000
Other real estate /assets owned																								9,587,000	13,892,000	0	0	0	0	9,587,000	13,892,000
Impaired loan (collateral dependent) [Abstract]
Impaired loans, fair value adjustments																					1,500,000	100,000	500,000
Other real estate owned [Abstract]
Other real estate /assets owned, fair value adjustment																					600,000	200,000	1,800,000
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance					0	211,000	0	211,000	2,652,000	2,640,000	2,364,000	2,282,000
Total recognized gains (losses) Included in net income					0	0	0	0	529,000	(169,000)	646,000	172,000
Issues					0	0	0	0	205,000	189,000	562,000	340,000
Settlements					0	0	0	0	(164,000)	(157,000)	(350,000)	(291,000)
Ending balance					0	211,000	0	211,000	3,222,000	2,503,000	3,222,000	2,503,000
Total gains for the period included in net income					0	0	0	0	529,000	(169,000)	646,000	172,000
Total gains, noninterest income	365,000	(326,000)	296,000	(119,000)
Total gains, noninterest expense	$ 0	$ 0	$ 0	$ 0

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Issues that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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