FAIR VALUE (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Carrying (Reported) Amount, Fair Value Disclosure [Member]	Dec. 31, 2010 Carrying (Reported) Amount, Fair Value Disclosure [Member]	Dec. 31, 2011 Portion at Fair Value, Fair Value Disclosure [Member]	Dec. 31, 2010 Portion at Fair Value, Fair Value Disclosure [Member]	Dec. 31, 2011 Pooled Trust Preferred Securities [Member]	Dec. 31, 2010 Pooled Trust Preferred Securities [Member]	Dec. 31, 2011 Real Estate Loan Origination and Sale Commitments [Member]	Dec. 31, 2010 Real Estate Loan Origination and Sale Commitments [Member]	Dec. 31, 2011 Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2010 Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member]	Dec. 31, 2010 Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member]	Dec. 31, 2010 Fair Value, Measurements, Nonrecurring [Member]	Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2010 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2010 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2010 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member]
Available-for-sale investment securities:
U.S. Treasury and agency securities															$ 520,548,000	$ 304,057,000	$ 311,958,000	$ 1,026,000	$ 208,590,000	$ 303,031,000	$ 0	$ 0
Obligations of state and political subdivisions															573,012,000	522,218,000	0	0	573,012,000	522,218,000	0	0
Government agency mortgage-backed securities															331,379,000	179,716,000	0	0	331,379,000	179,716,000	0	0
Corporate debt securities															22,855,000	27,157,000	0	0	22,855,000	27,157,000	0	0
Government agency collateralized mortgage obligations															46,943,000	10,395,000	0	0	46,943,000	10,395,000	0	0
Pooled trust preferred securities															43,846,000	41,993,000	0	0	0	0	43,846,000	41,993,000
Marketable equity securities															390,000	427,000	390,000	427,000	0	0	0	0
Total available-for-sale investment securities															1,538,973,000	1,085,963,000	312,348,000	1,453,000	1,182,779,000	1,042,517,000	43,846,000	41,993,000
Forward sales contracts															0	322,000	0	0	0	322,000	0	0
Commitments to originate real estate loans for sale															0	58,000	0	0	0	0	0	58,000
Mortgage loans held for sale															532,000	3,952,000	0	0	532,000	3,952,000	0	0
Interest rate swap															0	(3,232,000)	0	0	0	(3,232,000)	0	0
Total															1,539,505,000	1,087,063,000	312,348,000	1,453,000	1,183,311,000	1,043,559,000	43,846,000	42,051,000
Unpaid principal value of mortgage loans held for sale			532,000
Assets and Liabilities Measured on Nonrecurring Basis [Abstract]
Impaired loans																							4,118,000	703,000	0	0	0	0	4,118,000	703,000
Other real estate owned																							2,682,000	2,011,000	0	0	0	0	2,682,000	2,011,000
Mortgage servicing rights																							1,747,000	2,422,000	0	0	0	0	1,747,000	2,422,000
Total																							8,547,000	5,136,000	0	0	0	0	8,547,000	5,136,000
Goodwill impairment of Nottingham Advisors Wealth Management Business	3,079,000	1,745,000
Goodwill carrying amount for Nottingham Advisors Wealth Management Business				2,500,000
Level 3 Assets Measured at Fair Value on a Recurring Basis [Abstract]
Beginning balance									41,993,000	44,014,000	58,000	31,000	42,051,000	44,045,000
Total gains (losses) included in earnings									94,000	99,000	(258,000)	(1,421,000)	(164,000)	(1,322,000)
Total losses included in other comprehensive income									3,248,000	(527,000)	0	0	3,248,000	(527,000)
Principal reductions									(1,489,000)	(1,593,000)	0	0	(1,489,000)	(1,593,000)
Commitments to originate real estate loans held for sale, net									0	0	200,000	1,448,000	200,000	1,448,000
Ending balance									43,846,000	41,993,000	0	58,000	43,846,000	42,051,000
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net loans					3,471,025,000	3,026,363,000	3,491,729,000	3,039,331,000
Deposits					4,795,245,000	3,934,045,000	4,810,856,000	3,944,261,000
Borrowings					728,281,000	728,460,000	828,018,000	808,902,000
Subordinated debt held by unconsolidated subsidiary trusts					$ 102,048,000	$ 102,024,000	$ 73,211,000	$ 82,490,000