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Income Taxes - Reconciliation between Federal Statutory Income Tax Rate and Effective Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Disclosure [Abstract] |  |  |
Federal statutory income tax rate | 35.00% | 35.00% | 35.00%
State taxes, net of federal tax benefits | 8.32% | 5.86% | 4.40%
Tax-exempt municipal securities | (0.26%) | (0.07%) | (0.16%)
Tax credit - federal | (2.51%) | (2.27%) | (1.88%)
Bargain purchase gain | 0.00% | (7.03%) | 0.00%
Other | 0.95% | (0.01%) | (0.99%)
Valuation allowance | 0.00% | 0.00% | 0.00%
Effective tax rate | 41.50% | 31.48% | 36.37%

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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