Securities (Details) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Amortized costs and fair values of securities available for sale [Abstract]
Amortized Cost	$ 326,956,000		$ 309,196,000
Gross Unrealized Gains	6,543,000		11,416,000
Gross Unrealized Losses	(5,121,000)		(1,155,000)
Fair Value	328,378,000		319,457,000
Amortized Cost [Abstract]
Due in one year or less	2,520,000
Due after one year through five years	38,469,000
Due after one year through ten years	29,434,000
Due after ten years	44,420,000
Total	326,956,000
Fair Value [Abstract]
Due in one year or less	2,555,000
Due after one year through five years	39,035,000
Due after one year through ten years	28,617,000
Due after ten years	42,683,000
Total	328,378,000
Proceeds from sales of securities	12,700,000
Net gains realized on sale of securities	397,000
Tax expense related to realized gains	135,000
Carrying value of securities pledged for fiduciary powers	104,500,000
Fair Value [Abstract]
Less than Twelve Months	88,985,000		41,246,000
Twelve Months or Greater	14,084,000		9,575,000
Total	103,069,000		50,821,000
Gross Unrealized Losses [Abstract]
Less than Twelve Months	(4,541,000)		(442,000)
Twelve Months or Greater	(580,000)		(713,000)
Total	(5,121,000)		(1,155,000)
Credit losses recognized in prior period earnings	0	0
U.S. government agencies [Member]
Amortized costs and fair values of securities available for sale [Abstract]
Amortized Cost	21,360,000		15,391,000
Gross Unrealized Gains	349,000		459,000
Gross Unrealized Losses	(244,000)		(28,000)
Fair Value	21,465,000		15,822,000
Fair Value [Abstract]
Less than Twelve Months	11,019,000		3,850,000
Twelve Months or Greater	82,000		16,000
Total	11,101,000		3,866,000
Gross Unrealized Losses [Abstract]
Less than Twelve Months	(244,000)		(28,000)
Twelve Months or Greater	0		0
Total	(244,000)		(28,000)
Obligations of states and political subdivisions [Member]
Amortized costs and fair values of securities available for sale [Abstract]
Amortized Cost	77,788,000		74,485,000
Gross Unrealized Gains	1,483,000		3,920,000
Gross Unrealized Losses	(3,167,000)		(105,000)
Fair Value	76,104,000		78,300,000
Fair Value [Abstract]
Less than Twelve Months	29,161,000		6,966,000
Twelve Months or Greater	847,000		0
Total	30,008,000		6,966,000
Gross Unrealized Losses [Abstract]
Less than Twelve Months	(3,129,000)		(105,000)
Twelve Months or Greater	(38,000)		0
Total	(3,167,000)		(105,000)
Mortgage-backed securities [Member]
Amortized Cost [Abstract]
Total	176,317,000
Fair Value [Abstract]
Total	179,178,000
Mortgage-backed securities, Agency [Member]
Amortized costs and fair values of securities available for sale [Abstract]
Amortized Cost	158,204,000		161,564,000
Gross Unrealized Gains	3,864,000		5,659,000
Gross Unrealized Losses	(1,013,000)		(280,000)
Fair Value	161,055,000		166,943,000
Fair Value [Abstract]
Less than Twelve Months	37,619,000		24,344,000
Twelve Months or Greater	5,256,000		1,241,000
Total	42,875,000		25,585,000
Gross Unrealized Losses [Abstract]
Less than Twelve Months	(878,000)		(234,000)
Twelve Months or Greater	(135,000)		(46,000)
Total	(1,013,000)		(280,000)
Mortgage-backed securities, Non-agency [Member]
Amortized costs and fair values of securities available for sale [Abstract]
Amortized Cost	18,113,000		15,310,000
Gross Unrealized Gains	151,000		287,000
Gross Unrealized Losses	(141,000)		(18,000)
Fair Value	18,123,000		15,579,000
Fair Value [Abstract]
Less than Twelve Months	3,938,000		3,295,000
Twelve Months or Greater	1,354,000		0
Total	5,292,000		3,295,000
Gross Unrealized Losses [Abstract]
Less than Twelve Months	(81,000)		(18,000)
Twelve Months or Greater	(60,000)		0
Total	(141,000)		(18,000)
Other asset backed securities [Member]
Amortized costs and fair values of securities available for sale [Abstract]
Amortized Cost	35,728,000		33,648,000
Gross Unrealized Gains	659,000		1,079,000
Gross Unrealized Losses	(150,000)		(85,000)
Fair Value	36,237,000		34,642,000
Amortized Cost [Abstract]
Total	35,728,000
Fair Value [Abstract]
Total	36,237,000
Fair Value [Abstract]
Less than Twelve Months	1,592,000		2,791,000
Twelve Months or Greater	2,284,000		1,418,000
Total	3,876,000		4,209,000
Gross Unrealized Losses [Abstract]
Less than Twelve Months	(42,000)		(57,000)
Twelve Months or Greater	(108,000)		(28,000)
Total	(150,000)		(85,000)
Corporate preferred stock [Member]
Amortized costs and fair values of securities available for sale [Abstract]
Amortized Cost	68,000		68,000
Gross Unrealized Gains	5,000		0
Gross Unrealized Losses	0		(6,000)
Fair Value	73,000		62,000
Amortized Cost [Abstract]
Total	68,000
Fair Value [Abstract]
Total	73,000
Fair Value [Abstract]
Less than Twelve Months			0
Twelve Months or Greater			33,000
Total			33,000
Gross Unrealized Losses [Abstract]
Less than Twelve Months			0
Twelve Months or Greater			(6,000)
Total			(6,000)
Corporate securities [Member]
Amortized costs and fair values of securities available for sale [Abstract]
Amortized Cost	15,695,000		8,730,000
Gross Unrealized Gains	32,000		12,000
Gross Unrealized Losses	(406,000)		(633,000)
Fair Value	15,321,000		8,109,000
Fair Value [Abstract]
Less than Twelve Months	5,656,000		0
Twelve Months or Greater	4,261,000		6,867,000
Total	9,917,000		6,867,000
Gross Unrealized Losses [Abstract]
Less than Twelve Months	(167,000)		0
Twelve Months or Greater	(239,000)		(633,000)
Total	$ (406,000)		$ (633,000)