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Fair Market Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Other real estate owned [Abstract]
Maximum frequency of periodic reviews of real estate owned 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	$ 225		$ (278)	$ (30)	$ (507)
Total gain (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	225		(278)	(30)	(507)
Total gains (losses), noninterest income	225		(278)	$ (30)	(507)
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] | Fair Value [Member]
Available-for-sale securities [Abstract]
U.S. Treasury and government agencies	181,714	$ 188,932		$ 181,714		$ 188,932
State and political subdivisions	135,161	137,458		135,161		137,458
U.S. government sponsored agency mortgage-backed securities	239,564	288,907		239,564		288,907
CRA investment funds	24,797	24,889		24,797		24,889
Mortgage servicing rights	3,235	2,968		3,235		2,968
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Available-for-sale securities [Abstract]
U.S. Treasury and government agencies	497	492		497		492
State and political subdivisions	0	0		0		0
U.S. government sponsored agency mortgage-backed securities	0	0		0		0
CRA investment funds	24,797	24,889		24,797		24,889
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	181,217	188,440		181,217		188,440
State and political subdivisions	135,161	137,458		135,161		137,458
U.S. government sponsored agency mortgage-backed securities	239,564	288,907		239,564		288,907
CRA investment funds	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
CRA investment funds	0	0		0		0
Mortgage servicing rights	3,235	2,968		3,235		2,968
Recurring [Member] | Mortgage Servicing Rights [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	2,797		3,258	2,968	3,424	3,424
Total recognized gains (losses) Included in net income	446		(166)	285	(292)
Issues	213		82	297	145
Settlements	(221)		(112)	(315)	(215)
Ending balance	3,235	2,968	3,062	3,235	3,062	2,968
Total gain (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	446		(166)	285	(292)
Total gains (losses), noninterest income	446		(166)	285	(292)
Nonrecurring [Member]
Impaired loan (collateral dependent) [Abstract]
Impaired loans, fair value adjustments	15	300	38	500	200	400
Other real estate owned [Abstract]
Other real estate /assets owned, fair value adjustment	300	1,500	$ 300	400	$ 1,200	1,700
Nonrecurring [Member] | Fair Value [Member]
Assets measured-nonrecurring basis [Abstract]
Impaired loans (collateral dependent)	2,677	4,665		2,677		4,665
Other real estate /assets owned	1,070	6,472		1,070		6,472
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)	2,677	4,665		2,677		4,665
Other real estate /assets owned	$ 1,070	$ 6,472		$ 1,070		$ 6,472

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