Allowance for Loan Losses (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Summary of activity in the allowance for loan losses, and ending balance of loans, net of unearned fees for the periods indicated
Beginning balance	$ 42,648,000	$ 45,914,000	$ 45,914,000
Charge-offs	(2,771,000)	(4,922,000)	(16,484,000)
Recoveries	1,098,000	464,000	3,795,000
(Benefit) provision	(1,108,000)	3,996,000	9,423,000
Ending balance	39,867,000	45,452,000	42,648,000
Ending balance:
Individually evaluated for impairment, Allowance for Loan Losses	5,045,000	4,776,000	4,505,000
Loans pooled for evaluation, Allowance for Loan Losses	30,520,000	35,889,000	33,233,000
Loans acquired with deteriorated credit quality, Allowance for Loan Losses	4,302,000	4,787,000	4,910,000
Total loans	1,532,362,000	1,511,085,000	1,564,823,000
Individually evaluated for impairment loans, net of unearned fees	90,240,000	112,220,000	101,330,000
Loans pooled for evaluation, net of unearned fees	1,377,219,000	1,320,459,000	1,393,925,000
Loans acquired with deteriorated credit quality, net of unearned fees	64,903,000	78,406,000	69,568,000
RE Mortgage [Member] | Residential [Member]
Summary of activity in the allowance for loan losses, and ending balance of loans, net of unearned fees for the periods indicated
Beginning balance	3,523,000	2,404,000	2,404,000
Charge-offs	(7,000)	(223,000)	(1,558,000)
Recoveries			147,000
(Benefit) provision	(173,000)	976,000	2,530,000
Ending balance	3,343,000	3,157,000	3,523,000
Ending balance:
Individually evaluated for impairment, Allowance for Loan Losses	479,000	582,000	631,000
Loans pooled for evaluation, Allowance for Loan Losses	2,498,000	2,463,000	2,526,000
Loans acquired with deteriorated credit quality, Allowance for Loan Losses	366,000	113,000	366,000
Total loans	135,960,000	130,500,000	131,684,000
Individually evaluated for impairment loans, net of unearned fees	6,238,000	10,490,000	6,586,000
Loans pooled for evaluation, net of unearned fees	124,712,000	113,808,000	120,082,000
Loans acquired with deteriorated credit quality, net of unearned fees	5,010,000	6,202,000	5,016,000
RE Mortgage [Member] | Commercial [Member]
Summary of activity in the allowance for loan losses, and ending balance of loans, net of unearned fees for the periods indicated
Beginning balance	8,782,000	13,217,000	13,217,000
Charge-offs	(803,000)	(1,305,000)	(3,457,000)
Recoveries	353,000	36,000	1,020,000
(Benefit) provision	1,078,000	(1,967,000)	(1,998,000)
Ending balance	9,410,000	9,981,000	8,782,000
Ending balance:
Individually evaluated for impairment, Allowance for Loan Losses	1,804,000	1,041,000	515,000
Loans pooled for evaluation, Allowance for Loan Losses	7,326,000	8,939,000	8,026,000
Loans acquired with deteriorated credit quality, Allowance for Loan Losses	280,000		241,000
Total loans	874,289,000	816,859,000	878,446,000
Individually evaluated for impairment loans, net of unearned fees	64,812,000	69,817,000	71,077,000
Loans pooled for evaluation, net of unearned fees	777,466,000	714,579,000	776,137,000
Loans acquired with deteriorated credit quality, net of unearned fees	32,011,000	32,463,000	31,232,000
Home Equity Lines [Member]
Summary of activity in the allowance for loan losses, and ending balance of loans, net of unearned fees for the periods indicated
Beginning balance	21,367,000	18,258,000	18,258,000
Charge-offs	(766,000)	(2,625,000)	(8,042,000)
Recoveries	290,000	63,000	398,000
(Benefit) provision	(1,568,000)	6,336,000	10,753,000
Ending balance	19,323,000	22,032,000	21,367,000
Ending balance:
Individually evaluated for impairment, Allowance for Loan Losses	1,613,000	1,578,000	2,264,000
Loans pooled for evaluation, Allowance for Loan Losses	16,496,000	18,949,000	17,862,000
Loans acquired with deteriorated credit quality, Allowance for Loan Losses	1,214,000	1,505,000	1,241,000
Total loans	333,044,000	350,062,000	342,025,000
Individually evaluated for impairment loans, net of unearned fees	8,721,000	8,777,000	10,056,000
Loans pooled for evaluation, net of unearned fees	311,258,000	327,018,000	318,403,000
Loans acquired with deteriorated credit quality, net of unearned fees	13,065,000	14,267,000	13,566,000
Home Equity Loans [Member]
Summary of activity in the allowance for loan losses, and ending balance of loans, net of unearned fees for the periods indicated
Beginning balance	1,155,000	1,101,000	1,101,000
Charge-offs	(26,000)	(41,000)	(385,000)
Recoveries	9,000	3,000	100,000
(Benefit) provision	(1,000)	204,000	339,000
Ending balance	1,137,000	1,267,000	1,155,000
Ending balance:
Individually evaluated for impairment, Allowance for Loan Losses	50,000	59,000	81,000
Loans pooled for evaluation, Allowance for Loan Losses	1,006,000	1,096,000	995,000
Loans acquired with deteriorated credit quality, Allowance for Loan Losses	81,000	111,000	79,000
Total loans	13,083,000	14,559,000	13,557,000
Individually evaluated for impairment loans, net of unearned fees	576,000	549,000	528,000
Loans pooled for evaluation, net of unearned fees	12,304,000	13,805,000	12,825,000
Loans acquired with deteriorated credit quality, net of unearned fees	203,000	205,000	204,000
Auto indirect [Member]
Summary of activity in the allowance for loan losses, and ending balance of loans, net of unearned fees for the periods indicated
Beginning balance	243,000	215,000	215,000
Charge-offs	(25,000)	(40,000)	(83,000)
Recoveries	85,000	57,000	215,000
(Benefit) provision	(155,000)	343,000	(104,000)
Ending balance	148,000	575,000	243,000
Ending balance:
Individually evaluated for impairment, Allowance for Loan Losses	7,000	14,000	5,000
Loans pooled for evaluation, Allowance for Loan Losses	141,000	560,000	238,000
Loans acquired with deteriorated credit quality, Allowance for Loan Losses
Total loans	2,821,000	8,397,000	3,816,000
Individually evaluated for impairment loans, net of unearned fees	176,000	404,000	197,000
Loans pooled for evaluation, net of unearned fees	2,645,000	7,993,000	3,619,000
Other Consumer [Member]
Summary of activity in the allowance for loan losses, and ending balance of loans, net of unearned fees for the periods indicated
Beginning balance	696,000	932,000	932,000
Charge-offs	(273,000)	(339,000)	(1,202,000)
Recoveries	224,000	255,000	860,000
(Benefit) provision	(84,000)	(248,000)	106,000
Ending balance	563,000	600,000	696,000
Ending balance:
Individually evaluated for impairment, Allowance for Loan Losses	8,000	17,000	47,000
Loans pooled for evaluation, Allowance for Loan Losses	555,000	584,000	649,000
Loans acquired with deteriorated credit quality, Allowance for Loan Losses
Total loans	27,115,000	23,671,000	26,713,000
Individually evaluated for impairment loans, net of unearned fees	97,000	177,000	121,000
Loans pooled for evaluation, net of unearned fees	26,993,000	23,446,000	26,560,000
Loans acquired with deteriorated credit quality, net of unearned fees	25,000	48,000	32,000
C&I [Member]
Summary of activity in the allowance for loan losses, and ending balance of loans, net of unearned fees for the periods indicated
Beginning balance	4,703,000	6,545,000	6,545,000
Charge-offs	(790,000)	(281,000)	(1,251,000)
Recoveries	70,000	50,000	643,000
(Benefit) provision	252,000	(1,764,000)	(1,234,000)
Ending balance	4,235,000	4,550,000	4,703,000
Ending balance:
Individually evaluated for impairment, Allowance for Loan Losses	823,000	357,000	840,000
Loans pooled for evaluation, Allowance for Loan Losses	1,935,000	2,563,000	2,342,000
Loans acquired with deteriorated credit quality, Allowance for Loan Losses	1,477,000	1,630,000	1,521,000
Total loans	115,483,000	128,343,000	135,528,000
Individually evaluated for impairment loans, net of unearned fees	5,867,000	9,286,000	8,562,000
Loans pooled for evaluation, net of unearned fees	101,187,000	106,689,000	117,429,000
Loans acquired with deteriorated credit quality, net of unearned fees	8,429,000	12,368,000	9,537,000
Construction [Member] | Residential [Member]
Summary of activity in the allowance for loan losses, and ending balance of loans, net of unearned fees for the periods indicated
Beginning balance	1,400,000	1,817,000	1,817,000
Charge-offs	(20,000)	(68,000)	(406,000)
Recoveries	61,000		412,000
(Benefit) provision	(105,000)	(77,000)	(423,000)
Ending balance	1,336,000	1,672,000	1,400,000
Ending balance:
Individually evaluated for impairment, Allowance for Loan Losses	219,000	80,000	11,000
Loans pooled for evaluation, Allowance for Loan Losses	438,000	625,000	430,000
Loans acquired with deteriorated credit quality, Allowance for Loan Losses	679,000	967,000	959,000
Total loans	19,521,000	22,364,000	18,459,000
Individually evaluated for impairment loans, net of unearned fees	3,410,000	5,606,000	3,596,000
Loans pooled for evaluation, net of unearned fees	11,088,000	7,569,000	8,281,000
Loans acquired with deteriorated credit quality, net of unearned fees	5,023,000	9,189,000	6,582,000
Construction [Member] | Commercial [Member]
Summary of activity in the allowance for loan losses, and ending balance of loans, net of unearned fees for the periods indicated
Beginning balance	779,000	1,425,000	1,425,000
Charge-offs	(61,000)		(100,000)
Recoveries	6,000
(Benefit) provision	(352,000)	193,000	(546,000)
Ending balance	372,000	1,618,000	779,000
Ending balance:
Individually evaluated for impairment, Allowance for Loan Losses	42,000	1,048,000	111,000
Loans pooled for evaluation, Allowance for Loan Losses	125,000	110,000	165,000
Loans acquired with deteriorated credit quality, Allowance for Loan Losses	205,000	461,000	503,000
Total loans	11,046,000	16,330,000	14,595,000
Individually evaluated for impairment loans, net of unearned fees	343,000	7,114,000	607,000
Loans pooled for evaluation, net of unearned fees	9,566,000	5,552,000	10,589,000
Loans acquired with deteriorated credit quality, net of unearned fees	$ 1,137,000	$ 3,664,000	$ 3,399,000