Loans and Allowance for Credit Losses Allowance for Loan Losses by Portfolio Segment (Details) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Provision for loan losses gross	$ 200,000		$ 291,000		$ 400,000		$ 341,000
Beginning Balance	197,089,000		220,041,000		202,780,000		223,903,000
Loans charged off	(11,476,000)		(21,383,000)		(21,744,000)		(43,489,000)
Recoveries of loans previously charged off	2,412,000		3,982,000		4,269,000		7,176,000
Net loans charged off	(9,064,000)		(17,401,000)		(17,475,000)		(36,313,000)
Provision for loan losses	3,660,000	[1]	13,791,000		6,380,000	[1]	28,841,000
Ending Balance	191,685,000		216,431,000		191,685,000		216,431,000
Provision for Loan and Lease Losses	3,500,000		13,500,000		6,000,000		28,500,000
Real-estate commercial mortage [Member]
Beginning Balance	53,757,000		63,985,000		55,659,000		62,928,000
Loans charged off	(2,141,000)		(5,193,000)		(3,527,000)		(9,326,000)
Recoveries of loans previously charged off	430,000		1,505,000		474,000		2,569,000
Net loans charged off	(1,711,000)		(3,688,000)		(3,053,000)		(6,757,000)
Provision for loan losses	(2,204,000)	[1]	(1,601,000)		(2,764,000)	[1]	2,525,000
Ending Balance	49,842,000		58,696,000		49,842,000		58,696,000
Commercial - industrial, financial, and agricultural
Beginning Balance	50,563,000		56,672,000		50,330,000		60,205,000
Loans charged off	(5,512,000)		(5,960,000)		(10,637,000)		(15,462,000)
Recoveries of loans previously charged off	775,000		756,000		1,519,000		1,135,000
Net loans charged off	(4,737,000)		(5,204,000)		(9,118,000)		(14,327,000)
Provision for loan losses	3,258,000	[1]	6,089,000		7,872,000	[1]	11,679,000
Ending Balance	49,084,000		57,557,000		49,084,000		57,557,000
Real-estate - home equity [Member]
Beginning Balance	32,460,000		23,701,000		28,222,000		22,776,000
Loans charged off	(1,234,000)		(1,966,000)		(2,885,000)		(4,370,000)
Recoveries of loans previously charged off	177,000		192,000		533,000		523,000
Net loans charged off	(1,057,000)		(1,774,000)		(2,352,000)		(3,847,000)
Provision for loan losses	638,000	[1]	3,809,000		6,171,000	[1]	6,807,000
Ending Balance	32,041,000		25,736,000		32,041,000		25,736,000
Real-estate - residential mortgage [Member]
Beginning Balance	33,329,000		33,484,000		33,082,000		34,536,000
Loans charged off	(1,089,000)		(4,465,000)		(1,935,000)		(7,515,000)
Recoveries of loans previously charged off	108,000		116,000		224,000		197,000
Net loans charged off	(981,000)		(4,349,000)		(1,711,000)		(7,318,000)
Provision for loan losses	396,000	[1]	3,549,000		1,373,000	[1]	5,466,000
Ending Balance	32,744,000		32,684,000		32,744,000		32,684,000
Real-estate - construction
Beginning Balance	9,842,000		16,004,000		12,649,000		17,287,000
Loans charged off	(218,000)		(2,597,000)		(432,000)		(4,583,000)
Recoveries of loans previously charged off	158,000		744,000		382,000		1,415,000
Net loans charged off	(60,000)		(1,853,000)		(50,000)		(3,168,000)
Provision for loan losses	1,549,000	[1]	320,000		(1,268,000)	[1]	352,000
Ending Balance	11,331,000		14,471,000		11,331,000		14,471,000
Consumer
Beginning Balance	3,324,000		2,286,000		3,260,000		2,367,000
Loans charged off	(449,000)		(433,000)		(1,200,000)		(983,000)
Recoveries of loans previously charged off	402,000		406,000		611,000		912,000
Net loans charged off	(47,000)		(27,000)		(589,000)		(71,000)
Provision for loan losses	29,000	[1]	238,000		635,000	[1]	201,000
Ending Balance	3,306,000		2,497,000		3,306,000		2,497,000
Leasing and other and overdrafts [Member]
Beginning Balance	2,011,000		2,787,000		3,370,000		2,752,000
Loans charged off	(833,000)		(769,000)		(1,128,000)		(1,250,000)
Recoveries of loans previously charged off	362,000		263,000		526,000		425,000
Net loans charged off	(471,000)		(506,000)		(602,000)		(825,000)
Provision for loan losses	311,000	[1]	644,000		(917,000)	[1]	998,000
Ending Balance	1,851,000		2,925,000		1,851,000		2,925,000
Unallocated
Beginning Balance	11,803,000		21,122,000		16,208,000		21,052,000
Loans charged off	0		0		0		0
Recoveries of loans previously charged off	0		0		0		0
Net loans charged off	0		0		0		0
Provision for loan losses	(317,000)	[1]	743,000		(4,722,000)	[1]	813,000
Ending Balance	$ 11,486,000	[2]	$ 21,865,000	[2]	$ 11,486,000	[2]	$ 21,865,000	[2]

[1] The provision for loan losses excluded a $160,000 and $380,000 decrease, respectively, in the reserve for unfunded lending commitments for the three and six months ended June 30, 2014 and excluded a $291,000 and $341,000 decrease, respectively, in the reserve for unfunded lending commitments for the three and six months ended June 30, 2013. The total provision for credit losses, comprised of allocations for both funded and unfunded loans, was $3.5 million and $6.0 million, respectively, for the three and six months ended June 30, 2014 and $13.5 million and $28.5 million, respectively, for the three and six months ended June 30, 2013.

[2] The unallocated allowance, which was approximately 6% and 10% of the total allowance for credit losses as of June 30, 2014 and June 30, 2013, respectively, was, in the opinion of management, reasonable and appropriate given that the estimates used in the allocation process are inherently imprecise.