Securities (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Amortized costs and fair values of securities available for sale [Abstract]
Amortized Cost	$ 306,357,000		$ 306,357,000		$ 301,979,000
Gross Unrealized Gains	10,039,000		10,039,000		8,440,000
Gross Unrealized Losses	(1,866,000)		(1,866,000)		(2,177,000)
Fair Value	314,530,000		314,530,000		308,242,000
Amortized Cost [Abstract]
Due in one year or less	4,013,000		4,013,000
Due after one year through five years	18,524,000		18,524,000
Due after five years through ten years	34,031,000		34,031,000
Due after ten years	31,868,000		31,868,000
Total	306,357,000		306,357,000
Fair Value [Abstract]
Due in one year or less	4,039,000		4,039,000
Due after one year through five years	18,547,000		18,547,000
Due after five years through ten years	35,696,000		35,696,000
Due after ten years	33,177,000		33,177,000
Total	314,530,000		314,530,000
Sale proceeds of securities			16,000,000
Gains on sale of securities	148,000	87,000	288,000	122,000
Tax expense related to realized gains			98,000
Carrying value of securities pledged for fiduciary powers	148,300,000		148,300,000
Gross Unrealized Losses [Abstract]
Less than Twelve Months	(885,000)		(885,000)		(2,634,000)
Twelve Months or Greater	(981,000)		(981,000)		(1,258,000)
Total	(1,866,000)		(1,866,000)		(2,177,000)
Fair Value [Abstract]
Less than Twelve Months	42,084,000		42,084,000		47,976,000
Twelve Months or Greater	14,942,000		14,942,000		10,595,000
Total	57,026,000		57,026,000		58,571,000
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Number of securities temporarily impaired	51		51
Number of securities temporarily impaired in investment grade	50		50
Number of securities temporarily impaired in speculative grade	1		1
Credit related impairment losses on securities			0	1,000
Amount of OTTI Related to Credit Loss			142,000
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Net impairment recognized in earnings through end of period	2,400,000		2,400,000
Available-for-sale Securities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Par Value	244,000		244,000
Book Value	244,000		244,000
Fair Value	111,000		111,000
Cumulative Other Comprehensive Loss			133,000
Current Moody's Rating Ca [Member] | Trust Preferred IV [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Par Value	244,000		244,000
Book Value	244,000		244,000
Fair Value	111,000		111,000
Cumulative Other Comprehensive Loss			133,000
Excess subordinated securities (in hundredths)			19.71%
Number of institutions performing securities			4
Deferrals/Defaults (in hundredths)			27.10%
Expected Default Rate (in hundredths)			0.50%
Expected Recovery (in hundredths)			15.00%
Lag Years			2 years
U.S. government agencies [Member]
Amortized costs and fair values of securities available for sale [Abstract]
Amortized Cost	8,764,000		8,764,000		9,068,000
Gross Unrealized Gains	374,000		374,000		293,000
Gross Unrealized Losses	0		0		(18,000)
Fair Value	9,138,000		9,138,000		9,343,000
Gross Unrealized Losses [Abstract]
Less than Twelve Months	0		0		(18,000)
Twelve Months or Greater	0		0		0
Total	0		0		(18,000)
Fair Value [Abstract]
Less than Twelve Months	375,000		375,000		2,045,000
Twelve Months or Greater	25,000		25,000		26,000
Total	400,000		400,000		2,071,000
Obligations of states and political subdivisions [Member]
Amortized costs and fair values of securities available for sale [Abstract]
Amortized Cost	69,061,000		69,061,000		65,090,000
Gross Unrealized Gains	3,546,000		3,546,000		2,503,000
Gross Unrealized Losses	(4,000)		(4,000)		(51,000)
Fair Value	72,603,000		72,603,000		67,542,000
Gross Unrealized Losses [Abstract]
Less than Twelve Months	(4,000)		(4,000)		0
Twelve Months or Greater	0		0		(51,000)
Total	(4,000)		(4,000)		(51,000)
Fair Value [Abstract]
Less than Twelve Months	1,937,000		1,937,000		43,000
Twelve Months or Greater	0		0		2,243,000
Total	1,937,000		1,937,000		2,286,000
Mortgage-backed Securities, Agency [Member]
Amortized costs and fair values of securities available for sale [Abstract]
Amortized Cost	168,363,000		168,363,000		181,797,000
Gross Unrealized Gains	5,728,000		5,728,000		5,482,000
Gross Unrealized Losses	(281,000)		(281,000)		(209,000)
Fair Value	173,810,000		173,810,000		187,070,000
Gross Unrealized Losses [Abstract]
Less than Twelve Months	(281,000)		(281,000)		(209,000)
Twelve Months or Greater	0		0		0
Total	(281,000)		(281,000)		(209,000)
Fair Value [Abstract]
Less than Twelve Months	18,601,000		18,601,000		22,768,000
Twelve Months or Greater	0		0		0
Total	18,601,000		18,601,000		22,768,000
Mortgage-backed Securities, Non-agency [Member]
Amortized costs and fair values of securities available for sale [Abstract]
Amortized Cost	49,246,000		49,246,000		34,847,000
Gross Unrealized Gains	383,000		383,000		157,000
Gross Unrealized Losses	(534,000)		(534,000)		(1,002,000)
Fair Value	49,095,000		49,095,000		34,002,000
Gross Unrealized Losses [Abstract]
Less than Twelve Months	(264,000)		(264,000)		(465,000)
Twelve Months or Greater	(270,000)		(270,000)		(537,000)
Total	(534,000)		(534,000)		(1,002,000)
Fair Value [Abstract]
Less than Twelve Months	18,007,000		18,007,000		15,345,000
Twelve Months or Greater	8,374,000		8,374,000		5,989,000
Total	26,381,000		26,381,000		21,334,000
Corporate Preferred Stock [Member]
Amortized costs and fair values of securities available for sale [Abstract]
Amortized Cost	68,000		68,000		68,000
Gross Unrealized Gains	0		0		0
Gross Unrealized Losses	(14,000)		(14,000)		(28,000)
Fair Value	54,000		54,000		40,000
Gross Unrealized Losses [Abstract]
Less than Twelve Months	0		0		0
Twelve Months or Greater	(14,000)		(14,000)		(28,000)
Total	(14,000)		(14,000)		(28,000)
Fair Value [Abstract]
Less than Twelve Months	0		0		0
Twelve Months or Greater	25,000		25,000		11,000
Total	25,000		25,000		11,000
Corporate securities [Member]
Amortized costs and fair values of securities available for sale [Abstract]
Amortized Cost	10,611,000		10,611,000		10,612,000
Gross Unrealized Gains	8,000		8,000		5,000
Gross Unrealized Losses	(900,000)		(900,000)		(641,000)
Fair Value	9,719,000		9,719,000		9,976,000
Gross Unrealized Losses [Abstract]
Less than Twelve Months	(336,000)		(336,000)		(227,000)
Twelve Months or Greater	(564,000)		(564,000)		(414,000)
Total	(900,000)		(900,000)		(641,000)
Fair Value [Abstract]
Less than Twelve Months	3,164,000		3,164,000		7,775,000
Twelve Months or Greater	6,407,000		6,407,000		2,057,000
Total	9,571,000		9,571,000		9,832,000
Trust-preferred securities [Member]
Amortized costs and fair values of securities available for sale [Abstract]
Amortized Cost	244,000		244,000		497,000
Gross Unrealized Gains	0		0		0
Gross Unrealized Losses	(133,000)		(133,000)		(228,000)
Fair Value	111,000		111,000		269,000
Gross Unrealized Losses [Abstract]
Less than Twelve Months	0		0		0
Twelve Months or Greater	(133,000)		(133,000)		(228,000)
Total	(133,000)		(133,000)		(228,000)
Fair Value [Abstract]
Less than Twelve Months	0		0		0
Twelve Months or Greater	111,000		111,000		269,000
Total	111,000		111,000		269,000
Mortgage-backed securities [Member]
Amortized costs and fair values of securities available for sale [Abstract]
Amortized Cost	217,609,000		217,609,000
Fair Value	$ 222,906,000		$ 222,906,000