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Income Taxes - Reconciliation of Effective Tax Rate and Statutory Federal Income Tax Rate (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
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 6.70% 7.10% 6.80% 7.00%
Tax-exempt interest on municipal obligations (0.60%) (0.50%) (0.50%) (0.40%)
Increase in cash value of insurance policies (1.30%) (1.70%) (1.40%) (1.30%)
Nondeductible merger expenses   1.20%   0.60%
Other (0.30%) 1.00% 0.10% 0.30%
Effective Tax Rate 39.50% 42.10% 40.00% 41.20%