Fair Market Value of Financial Assets and Liabilities (Details) (USD $)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Other real estate owned [Abstract]
Maximum frequency of periodic reviews in general				24 months
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total recognized gains (losses) Included in net income	$ (39,000)		$ (123,000)	$ (546,000)	$ 173,000
Total gains (losses) 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	(39,000)		(123,000)	(546,000)	173,000
Total gains (losses), noninterest income	(39,000)		(123,000)	(546,000)	173,000
Total gains (losses), noninterest expense	0		0	0	0
Minimum [Member]
Other real estate owned [Abstract]
Frequency of periodic reviews				12 months
Maximum [Member]
Other real estate owned [Abstract]
Frequency of periodic reviews				18 months
Recurring [Member] | Mortgage Servicing Rights [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	3,062,000		3,222,000	3,424,000	2,364,000	2,364,000
Total recognized gains (losses) Included in net income	80,000		10,000	(212,000)	656,000
Issues	89,000		206,000	234,000	768,000
Settlements	(119,000)		(133,000)	(334,000)	(483,000)
Ending balance	3,112,000		3,305,000	3,112,000	3,305,000
Total gains (losses) 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	80,000		10,000	(212,000)	656,000
Total gains (losses), noninterest income	80,000		10,000	(212,000)	656,000
Recurring [Member] | Fair Value [Member]
Available-for-sale securities [Abstract]
U.S. Treasury and government agencies	138,408,000	60,610,000		138,408,000		60,610,000
State and political subdivisions	136,690,000	116,703,000		136,690,000		116,703,000
U.S. government sponsored agency mortgage-backed securities	333,793,000	379,310,000		333,793,000		379,310,000
Marketable equity securities	24,681,000	52,782,000		24,681,000		52,782,000
Mortgage servicing rights	3,112,000	3,424,000		3,112,000		3,424,000
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Available-for-sale securities [Abstract]
U.S. Treasury and government agencies	0	0		0		0
State and political subdivisions	0	0		0		0
U.S. government sponsored agency mortgage-backed securities	0	0		0		0
Marketable equity securities	24,681,000	52,782,000		24,681,000		52,782,000
Mortgage servicing rights	0	0		0		0
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Available-for-sale securities [Abstract]
U.S. Treasury and government agencies	138,408,000	60,610,000		138,408,000		60,610,000
State and political subdivisions	136,690,000	116,703,000		136,690,000		116,703,000
U.S. government sponsored agency mortgage-backed securities	333,793,000	379,310,000		333,793,000		379,310,000
Marketable equity securities	0	0		0		0
Mortgage servicing rights	0	0		0		0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Available-for-sale securities [Abstract]
U.S. Treasury and government agencies	0	0		0		0
State and political subdivisions	0	0		0		0
U.S. government sponsored agency mortgage-backed securities	0	0		0		0
Marketable equity securities	0	0		0		0
Mortgage servicing rights	3,112,000	3,424,000		3,112,000		3,424,000
Nonrecurring [Member]
Impaired loan (collateral dependent) [Abstract]
Impaired loans, fair value adjustments	1,300	(900,000)	(500,000)	1,500,000	1,600,000	600,000
Other real estate owned [Abstract]
Other real estate /assets owned, fair value adjustment	200,000	500,000	200,000	1,400,000	2,000,000	2,500,000
Nonrecurring [Member] | Fair Value [Member]
Assets measured-nonrecurring basis [Abstract]
Impaired loans (collateral dependent)	7,375,000	6,830,000		7,375,000		6,830,000
Other real estate /assets owned	6,316,000	11,111,000		6,316,000		11,111,000
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets measured-nonrecurring basis [Abstract]
Impaired loans (collateral dependent)	0	0		0		0
Other real estate /assets owned	0	0		0		0
Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets measured-nonrecurring basis [Abstract]
Impaired loans (collateral dependent)	0	0		0		0
Other real estate /assets owned	0	0		0		0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets measured-nonrecurring basis [Abstract]
Impaired loans (collateral dependent)	7,375,000	6,830,000		7,375,000		6,830,000
Other real estate /assets owned	$ 6,316,000	$ 11,111,000		$ 6,316,000		$ 11,111,000