Investment Securities (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Available for sale (AFS)
Amortized Cost	$ 275,674,000	$ 273,916,000
Gross Unrealized Gains	14,867,000	17,153,000
Gross Unrealized Losses	(1,964,000)	(1,753,000)
Fair Value	288,577,000	289,316,000
Gross unrealized losses and fair value
Fair Value, Less than Twelve Months	38,595,000	21,809,000
Gross Unrealized Losses, Less than Twelve Months	(777,000)	(553,000)
Fair value, Twelve Months or Greater	7,704,000	9,642,000
Gross Unrealized Losses, Twelve Months or Greater	(1,187,000)	(1,200,000)
Fair Value, Total	46,299,000	31,451,000
Gross Unrealized Losses, Total	(1,964,000)	(1,753,000)
Impairment of available for sale securities	0
Debt securities
Available for sale (AFS)
Amortized Cost	267,164,000	263,426,000
Gross Unrealized Gains	13,382,000	15,939,000
Gross Unrealized Losses	(1,938,000)	(1,702,000)
Fair Value	278,608,000	277,663,000
Gross unrealized losses and fair value
Fair Value, Less than Twelve Months	37,766,000	21,042,000
Gross Unrealized Losses, Less than Twelve Months	(756,000)	(524,000)
Fair value, Twelve Months or Greater	7,637,000	9,374,000
Gross Unrealized Losses, Twelve Months or Greater	(1,182,000)	(1,178,000)
Fair Value, Total	45,403,000	30,416,000
Gross Unrealized Losses, Total	(1,938,000)	(1,702,000)
U.S. Government and agency securities
Available for sale (AFS)
Amortized Cost	22,387,000	24,475,000
Gross Unrealized Gains	1,265,000	1,384,000
Gross Unrealized Losses	(17,000)	(19,000)
Fair Value	23,635,000	25,840,000
Gross unrealized losses and fair value
Fair Value, Less than Twelve Months	847,000	910,000
Gross Unrealized Losses, Less than Twelve Months	(17,000)	(19,000)
Fair Value, Total	847,000	910,000
Gross Unrealized Losses, Total	(17,000)	(19,000)
State and political securities
Available for sale (AFS)
Amortized Cost	160,817,000	168,843,000
Gross Unrealized Gains	10,260,000	12,805,000
Gross Unrealized Losses	(1,684,000)	(1,424,000)
Fair Value	169,393,000	180,224,000
Gross unrealized losses and fair value
Fair Value, Less than Twelve Months	12,448,000	8,882,000
Gross Unrealized Losses, Less than Twelve Months	(530,000)	(316,000)
Fair value, Twelve Months or Greater	5,915,000	5,647,000
Gross Unrealized Losses, Twelve Months or Greater	(1,154,000)	(1,108,000)
Fair Value, Total	18,363,000	14,529,000
Gross Unrealized Losses, Total	(1,684,000)	(1,424,000)
Other debt securities
Available for sale (AFS)
Amortized Cost	83,960,000	70,108,000
Gross Unrealized Gains	1,857,000	1,750,000
Gross Unrealized Losses	(237,000)	(259,000)
Fair Value	85,580,000	71,599,000
Gross unrealized losses and fair value
Fair Value, Less than Twelve Months	24,471,000	11,250,000
Gross Unrealized Losses, Less than Twelve Months	(209,000)	(189,000)
Fair value, Twelve Months or Greater	1,722,000	3,727,000
Gross Unrealized Losses, Twelve Months or Greater	(28,000)	(70,000)
Fair Value, Total	26,193,000	14,977,000
Gross Unrealized Losses, Total	(237,000)	(259,000)
Equity securities
Available for sale (AFS)
Amortized Cost	8,510,000	10,490,000
Gross Unrealized Gains	1,485,000	1,214,000
Gross Unrealized Losses	(26,000)	(51,000)
Fair Value	9,969,000	11,653,000
Gross unrealized losses and fair value
Fair Value, Less than Twelve Months	829,000	767,000
Gross Unrealized Losses, Less than Twelve Months	(21,000)	(29,000)
Fair value, Twelve Months or Greater	67,000	268,000
Gross Unrealized Losses, Twelve Months or Greater	(5,000)	(22,000)
Fair Value, Total	896,000	1,035,000
Gross Unrealized Losses, Total	(26,000)	(51,000)
Financial institution equity securities
Available for sale (AFS)
Amortized Cost	7,580,000	8,422,000
Gross Unrealized Gains	1,474,000	1,140,000
Gross Unrealized Losses	(3,000)	(14,000)
Fair Value	9,051,000	9,548,000
Gross unrealized losses and fair value
Fair Value, Less than Twelve Months	65,000	66,000
Gross Unrealized Losses, Less than Twelve Months	(3,000)	(1,000)
Fair value, Twelve Months or Greater		205,000
Gross Unrealized Losses, Twelve Months or Greater		(13,000)
Fair Value, Total	65,000	271,000
Gross Unrealized Losses, Total	(3,000)	(14,000)
Other equity securities
Available for sale (AFS)
Amortized Cost	930,000	2,068,000
Gross Unrealized Gains	11,000	74,000
Gross Unrealized Losses	(23,000)	(37,000)
Fair Value	918,000	2,105,000
Gross unrealized losses and fair value
Fair Value, Less than Twelve Months	764,000	701,000
Gross Unrealized Losses, Less than Twelve Months	(18,000)	(28,000)
Fair value, Twelve Months or Greater	67,000	63,000
Gross Unrealized Losses, Twelve Months or Greater	(5,000)	(9,000)
Fair Value, Total	831,000	764,000
Gross Unrealized Losses, Total	$ (23,000)	$ (37,000)