INCOME TAXES (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal tax expense	$ 2,298	$ 2,113	$ 6,634
State tax expense	1,278	572	2,004
Total current expense	3,576	2,685	8,638
Deferred :
Federal tax expense (benefit)	9,247	1,977	(4,639)
State tax expense (benefit)	912	992	(1,579)
Total deferred tax expense (benefit)	10,159	2,969	(6,218)
Decrease in valuation allowance	(136)
Income tax expense (benefit)
Total income tax expense	13,599	5,654	2,420
Effective income tax rate differs from the statutory tax rate
Statutory tax rate (as a percent)	35.00%	35.00%	35.00%
Increase (decrease) resulting from:
State taxes, net of federal tax benefit (as a percent)	3.70%	4.40%	1.70%
Tax exempt income - investments, net (as a percent)	(4.70%)	(9.70%)	(13.90%)
Bank-owned life insurance (as a percent)	(2.00%)	(3.50%)	(2.80%)
Disallowed merger costs (as a percent)	1.10%	2.50%	0.80%
Gain on Rome and Legacy (as a percent)		(3.20%)
Non-deductible goodwill on branch divestiture (as a percent)	0.90%	7.10%
Tax credits, net of basis reduction (as a percent)	(2.50%)	(7.30%)	(5.90%)
Reduction in valuation allowance (as a percent)	(0.90%)
Other, net (as a percent)	(1.50%)	(0.70%)	0.20%
Effective tax rate (as a percent)	29.10%	24.60%	15.10%
Reconciliation of the statutory federal income tax rate to the effective tax rate
Statutory tax rate	16,375	8,051	5,612
Increase (decrease) resulting from:
State taxes, net of federal tax benefit	1,715	1,017	276
Tax exempt income - investments, net	(2,187)	(2,222)	(2,222)
Bank-owned life insurance	(950)	(804)	(455)
Disallowed merger costs	523	572	132
Gain on Rome and Legacy		(736)
Non-deductible goodwill on branch divestiture	419	1,622
Tax credits, net of basis reduction	(1,148)	(1,688)	(948)
Reduction in valuation allowance	(428)
Other, net	(720)	(158)	25
Total income tax expense	13,599	5,654	2,420
Deferred tax assets:
Allowance for loan losses	16,971	17,439
Investments	(1,174)	209
Investment tax credits	8,537	8,612
Net unrealized loss on swaps and securities available for sale in OCI	2,549	3,510
Employee benefit plans	5,201	2,776
Purchase accounting adjustments	27,900	12,178
Net operating loss and capital loss carryforwards	9,216	6,125
Other	3,554	1,609
Deferred tax assets, net before valuation allowances	72,754	52,458
Valuation allowance	(2,749)	(2,140)
Deferred tax assets, net of valuation allowances	70,005	50,318
Deferred tax liabilities:
Bonus depreciation on premises and equipment	(3,172)	(1,186)
Intangible amortization	(9,104)	(8,388)
Deferred tax liabilities	(12,276)	(9,574)
Deferred tax asset, net	$ 57,729	$ 40,744	$ 18,674