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Income Taxes - Reconciliation of Effective Tax Rate and Statutory Federal Income Tax Rate (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Tax Disclosure [Abstract]        
Federal statutory income tax rate 35.00% 35.00% 35.00% 35.00%
State income taxes, net of federal tax benefit 7.10% 6.70% 7.00% 6.70%
Tax-exempt interest on municipal obligations (0.30%) (0.50%) (0.40%) (0.40%)
Increase in cash value of insurance policies (1.20%) (1.50%) (1.30%) (1.30%)
Nondeductible merger expenses 1.30%   0.90%  
Other 0.30% 0.30% 0.40% 0.40%
Effective Tax Rate 42.20% 40.00% 41.60% 40.40%