Annual report pursuant to Section 13 and 15(d)

The Federal Income Tax Statutory Rates To Income Before Income Taxes (Detail)

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The Federal Income Tax Statutory Rates To Income Before Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income tax at statutory federal rate, amount $ 18,047 $ 12,540 $ 9,358
Income tax at statutory federal rate, rate 35.00% 35.00% 35.00%
State income tax, net of federal tax effect, amount 709 967 715
State income tax, net of federal tax effect, rate 1.37% 2.70% 2.67%
Tax-exempt income, net of expenses, amount (1,007) (875) (773)
Tax-exempt income, net of expenses, rate (1.95%) (2.44%) (2.89%)
Bank owned life insurance contracts, amount (568) (137)  
Bank owned life insurance contracts, rate (1.10%) (0.38%)  
Incentive stock option expense, amount 121 128 144
Incentive stock option expense, rate 0.23% 0.36% 0.54%
Other, amount (182) (234) (86)
Other, rate (0.35%) (0.65%) (0.32%)
Effective income tax and rate, Amount $ (17,120) $ (12,389) $ (9,358)
Effective income tax rate 33.20% 34.59% 35.00%