Allowance for Loan Losses (Details 6) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Impaired financing receivables
Impaired financing receivable, with no related allowance, Recorded Investment	$ 16,120		$ 16,120		$ 7,580
Impaired financing receivable, with an allowance recorded, Recorded Investment	14,461		14,461		19,800
Impaired financing receivable, Recorded Investment, Total	30,581		30,581		27,380
Impaired financing receivable, with no related allowance, Unpaid Principal Balance	19,130		19,130		8,702
Impaired financing receivable, with an allowance recorded, Unpaid Principal Balance	17,214		17,214		25,409
Impaired financing receivable, Unpaid Principal Balance, Total	36,344		36,344		34,111
Impaired financing receivable with no related allowance
Impaired financing receivable, Related Allowance	5,075		5,075		4,811
Impaired financing receivable, Related Allowance, Total	5,075		5,075		4,811
Impaired financing receivable, Average Recorded Investment, Total	27,703	23,231	26,878	22,727
Impaired financing receivable, Interest Income Recognized, Total	512	1,015	1,603	1,499
Commercial & Agriculture [Member]
Impaired financing receivables
Impaired financing receivable, with no related allowance, Recorded Investment	5,003		5,003		2,914
Impaired financing receivable, with an allowance recorded, Recorded Investment	261		261		2,344
Impaired financing receivable, Recorded Investment, Total	5,264		5,264		5,258
Impaired financing receivable, with no related allowance, Unpaid Principal Balance	5,339		5,339		3,010
Impaired financing receivable, with an allowance recorded, Unpaid Principal Balance	271		271		3,645
Impaired financing receivable, Unpaid Principal Balance, Total	5,610		5,610		6,655
Impaired financing receivable with no related allowance
Impaired financing receivable, Related Allowance	251		251		618
Impaired financing receivable, Related Allowance, Total	251		251		618
Impaired financing receivable, Average Recorded Investment, Total	5,366	5,112	4,631	4,618
Impaired financing receivable, Interest Income Recognized, Total	26	168	205	330
Commercial Real Estate [Member]
Impaired financing receivables
Impaired financing receivable, with no related allowance, Recorded Investment	8,030		8,030		3,804
Impaired financing receivable, with an allowance recorded, Recorded Investment	10,120		10,120		13,896
Impaired financing receivable, Recorded Investment, Total	18,150		18,150		17,700
Impaired financing receivable, with no related allowance, Unpaid Principal Balance	9,192		9,192		4,739
Impaired financing receivable, with an allowance recorded, Unpaid Principal Balance	12,194		12,194		16,534
Impaired financing receivable, Unpaid Principal Balance, Total	21,386		21,386		21,273
Impaired financing receivable with no related allowance
Impaired financing receivable, Related Allowance	3,760		3,760		3,094
Impaired financing receivable, Related Allowance, Total	3,760		3,760		3,094
Impaired financing receivable, Average Recorded Investment, Total	16,448	13,953	17,060	12,975
Impaired financing receivable, Interest Income Recognized, Total	329	666	995	934
Residential Real Estate [Member]
Impaired financing receivables
Impaired financing receivable, with no related allowance, Recorded Investment	3,086		3,086		862
Impaired financing receivable, with an allowance recorded, Recorded Investment	3,133		3,133		2,984
Impaired financing receivable, Recorded Investment, Total	6,219		6,219		3,846
Impaired financing receivable, with no related allowance, Unpaid Principal Balance	4,598		4,598		953
Impaired financing receivable, with an allowance recorded, Unpaid Principal Balance	3,274		3,274		4,127
Impaired financing receivable, Unpaid Principal Balance, Total	7,872		7,872		5,080
Impaired financing receivable with no related allowance
Impaired financing receivable, Related Allowance	808		808		860
Impaired financing receivable, Related Allowance, Total	808		808		860
Impaired financing receivable, Average Recorded Investment, Total	5,227	3,317	4,628	3,574
Impaired financing receivable, Interest Income Recognized, Total	145	172	391	194
Real estate - construction [Member]
Impaired financing receivables
Impaired financing receivable, with no related allowance, Recorded Investment
Impaired financing receivable, with an allowance recorded, Recorded Investment	885		885		576
Impaired financing receivable, Recorded Investment, Total	885		885		576
Impaired financing receivable, with no related allowance, Unpaid Principal Balance
Impaired financing receivable, with an allowance recorded, Unpaid Principal Balance	1,413		1,413		1,103
Impaired financing receivable, Unpaid Principal Balance, Total	1,413		1,413		1,103
Impaired financing receivable with no related allowance
Impaired financing receivable, Related Allowance	194		194		239
Impaired financing receivable, Related Allowance, Total	194		194		239
Impaired financing receivable, Average Recorded Investment, Total	608	849	531	1,560
Impaired financing receivable, Interest Income Recognized, Total	11	9	11	41
Consumer and Other [Member]
Impaired financing receivables
Impaired financing receivable, with no related allowance, Recorded Investment	1		1
Impaired financing receivable, with an allowance recorded, Recorded Investment	62		62
Impaired financing receivable, Recorded Investment, Total	63		63
Impaired financing receivable, with no related allowance, Unpaid Principal Balance	1		1
Impaired financing receivable, with an allowance recorded, Unpaid Principal Balance	62		62
Impaired financing receivable, Unpaid Principal Balance, Total	63		63
Impaired financing receivable with no related allowance
Impaired financing receivable, Related Allowance	62		62
Impaired financing receivable, Related Allowance, Total	62		62
Impaired financing receivable, Average Recorded Investment, Total	54		28
Impaired financing receivable, Interest Income Recognized, Total	$ 1		$ 1