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Earnings per Share - Composition of Weighted-Average Common Shares (Denominator) Used in Basic and Diluted Earnings Per Share (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings Per Share [Line Items]
Weighted average common shares issued	105,563,455	105,550,310	94,388,523
Average treasury shares	(1,456,953)	(657,633)	(828,523)
Averaged unearned ESOP shares	(38,393)	(165,010)	(319,726)
Average unearned nonvested shares	(182,713)	(27,440)	(43,049)
Weighted average common shares and common stock equivalents used to calculate basic earnings per share	103,885,396	104,700,227	93,197,225
Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share	171	119	0
Additional common stock equivalents (stock options) used to calculate diluted earnings per share	96	47	2,548
Weighted average common shares and common stock equivalents used to calculate diluted earnings per share	103,885,663	104,700,393	93,199,773

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Weighted average number of additional shares.

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Weighted average number of additional shares non vested.

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Weighted average number of shares issued, basic and diluted.

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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 128

-Paragraph 40

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Shares issuable for little or no cash consideration upon the satisfaction of certain conditions (contingently issuable shares) are considered outstanding common shares and included in the computation of basic Earnings Per Share as of the date that all necessary conditions have been satisfied (in essence, when issuance of the shares is no longer contingent). Outstanding common shares that are contingently returnable (that is, subject to recall) are treated in the same manner as contingently issuable shares. Contingently issuable shares include shares that (a) will be issued in the future upon the satisfaction of specified conditions, (b) have been placed in escrow and all or part must be returned if specified conditions are not met, or (c) have been issued but the holder must return all or part if specified conditions are not met. The number of contingently issuable shares is determined by relating the portion of time within a reporting period that these shares have been outstanding to the total time in that period.

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Number of employee stock ownership plan (ESOP) shares that have not been committed to be released determined by relating the portion of time within a reporting period that these shares have been outstanding to the total time in that period.

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-Number 93-6

-Paragraph 28

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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Number of shares of treasury stock determined by relating the portion of time within a reporting period that treasury shares have been outstanding to the total time in that period. Treasury stock is stock that the Entity has issued but subsequently reacquired.

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