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Income Taxes - Reconciliation of Tax Expense at the Federal Statutory Tax Rate (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Tax expense at the Federal statutory tax rate	$ 28,295	$ 27,651	$ 24,744
Increase (decrease) in tax expense from:
Tax-exempt income, net	(621)	(783)	(904)
Modified endowment life contracts	(812)	(870)	(809)
State tax expense, net of Federal tax benefit	3,543	3,652	3,916
Federal tax credits	(4,132)	(2,455)	(1,227)
Other, net	252	(91)	(644)
Total income taxes	$ 26,525	$ 27,104	$ 25,076

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible life insurance expense.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes.

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