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Fair 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										3 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jun. 30, 2012 Recurring [Member] Marketable Equity Securities [Member]	Jun. 30, 2011 Recurring [Member] Marketable Equity Securities [Member]	Jun. 30, 2012 Recurring [Member] Marketable Equity Securities [Member]	Jun. 30, 2011 Recurring [Member] Marketable Equity Securities [Member]	Jun. 30, 2012 Recurring [Member] Mortgage Servicing Rights [Member]	Jun. 30, 2011 Recurring [Member] Mortgage Servicing Rights [Member]	Jun. 30, 2012 Recurring [Member] Mortgage Servicing Rights [Member]	Jun. 30, 2011 Recurring [Member] Mortgage Servicing Rights [Member]	Jun. 30, 2012 Recurring [Member] Fair Value [Member]	Dec. 31, 2011 Recurring [Member] Fair Value [Member]	Jun. 30, 2012 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	Dec. 31, 2011 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	Jun. 30, 2012 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2011 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Jun. 30, 2012 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2011 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Jun. 30, 2012 Nonrecurring [Member]	Dec. 31, 2011 Nonrecurring [Member]	Jun. 30, 2011 Nonrecurring [Member]	Jun. 30, 2012 Nonrecurring [Member] Fair Value [Member]	Dec. 31, 2011 Nonrecurring [Member] Fair Value [Member]	Jun. 30, 2012 Nonrecurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	Dec. 31, 2011 Nonrecurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	Jun. 30, 2012 Nonrecurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2011 Nonrecurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Jun. 30, 2012 Nonrecurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2011 Nonrecurring [Member] Significant Unobservable Inputs (Level 3) [Member]
Available-for-Sale [Abstract]
U.S. Treasury and government agencies											$ 26,665,000	$ 33,248,000	$ 0	$ 0	$ 26,665,000	$ 33,248,000	$ 0	$ 0
State and political subdivisions											98,167,000	72,144,000	0	0	98,167,000	72,144,000	0	0
U.S. government sponsored agency mortgage-backed securities											477,846,000	400,843,000	0	507,000	477,846,000	400,336,000	0	0
Marketable equity securities											26,564,000	21,163,000	26,353,000	20,675,000	0	277,000	211,000	211,000
Mortgage servicing rights											2,503,000	2,282,000	0	0	0	0	2,503,000	2,282,000
Assets measured-nonrecurring basis [Abstract]
Impaired loans (collateral dependent)																						6,073,000	7,898,000	0	0	0	0	6,073,000	7,898,000
Other real estate /assets owned																						3,783,000	16,362,000	0	0	0	0	3,783,000	16,362,000
Impaired loan (collateral dependent) [Abstract]
Impaired loans, fair value adjustments																			100,000	2,100,000	1,000,000
Other real estate owned [Abstract]
Other real estate /assets owned, fair value adjustment																			300,000	3,700,000	1,700,000
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			211,000	211,000	211,000	211,000	2,640,000	3,251,000	2,282,000	3,161,000
Total recognized gains (losses) Included in net income			0	0	0	0	(169,000)	(338,000)	172,000	(194,000)
Issues			0	0	0	0	189,000	115,000	340,000	251,000
Settlements			0	0	0	0	(157,000)	1,000	(291,000)	(189,000)
Ending balance			211,000	211,000	211,000	211,000	2,503,000	3,029,000	2,503,000	3,029,000
Total gains for the period included in net income attributable to the change in unrealized gains or losses related to assets still held at the reporting date			0	0	0	0	(169,000)	(338,000)	172,000	(194,000)
Total gains, noninterest income	(326,000)	(119,000)
Total gains, noninterest expense	$ 0	$ 0

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The amount at which an asset could be bought or sold in a current transaction between willing parties, that is, other than in a forced or liquidation sale.

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This item represent fair value disclosure in U.S. government agency mortgage-backed securities, available-for-sale at fair value.

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Amount of gain (loss) recognized in earnings, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3).

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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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Settlements 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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This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

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