INCOME TAXES (The Federal Income Tax Statutory Rates To Income Before Income Taxes) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income tax at statutory federal rate, amount	$ 25,892	$ 21,691	$ 18,047
Income tax at statutory federal rate, Pre-tax Earnings	35.00%	35.00%	35.00%
State income tax, net of federal tax effect, amount	(358)	462	732
State income tax, net of federal tax effect, Pre-tax Earnings	(0.49%)	0.75%	1.42%
Tax-exempt income, net of expenses, amount	(1,316)	(1,200)	(1,007)
Tax-exempt income, net of expenses, Pre-tax Earnings	(1.78%)	(1.94%)	(1.95%)
Bank owned life insurance contracts, amount	(798)	(698)	(568)
Bank owned life insurance contracts, Pre-tax Earnings	(1.08%)	(1.13%)	(1.10%)
Incentive stock option expense, amount	(18)	66	121
Incentive stock option expense, Pre-tax Earnings	(0.02%)	0.11%	0.23%
Federal tax credits, amount	(1,659)
Federal tax credits, Pre-tax Earnings	(2.24%)
Other, amount	(142)	(37)	(206)
Other, Pre-tax Earnings	(0.19%)	(0.06%)	(0.40%)
Effective income tax and rate, amount	$ 21,601	$ 20,358	$ 17,120
Effective income tax and rate, Pre-tax Earnings	29.20%	32.85%	33.20%