Income Taxes - Income Tax Provision Differences from Expected Statutory Provision (Detail)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Expected provision at statutory rate	35.00%	35.00%	35.00%
Difference resulting from:
Tax exempt interest income	(11.20%)	(11.70%)	(12.10%)
Increase in value of bank owned life insurance assets	(1.90%)	(3.90%)	(3.50%)
Other, including state income taxes, valuation allowances and rate differentials	3.20%	1.80%	1.60%
Provision for income taxes - effective income tax rate	25.10%	21.20%	21.00%

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage 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 other adjustments.

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Effective income tax rate reconciliation company owned life insurance.

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