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Earnings Per Common Share - Basic and Diluted Earnings Per Common Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Earnings Per Share [Abstract] |  |  |  |
Net income | $ 59,663 | $ 58,062 | $ 114,851 | $ 119,095
Less: Preferred stock dividends | 2,688 |  | 2,688 |
Net income available to common shareholders | 56,975 | 58,062 | 112,163 | 119,095
Less: Earnings allocated to participating securities | 209 | 185 | 407 | 376
Net earnings allocated to common stock | 56,766 | 57,877 | 111,756 | 118,719
Distributed earnings allocated to common stock | 30,058 | 29,424 | 58,733 | 57,575
Undistributed earnings allocated to common stock | 26,708 | 28,453 | 53,023 | 61,144
Net earnings allocated to common stock | $ 56,766 | $ 57,877 | $ 111,756 | $ 118,719
Weighted-average shares outstanding for basic earnings per common share | 60,010,527 | 61,290,792 | 60,299,939 | 61,245,959
Dilutive effect of stock compensation | 664,597 | 344,044 | 628,961 | 338,732
Weighted-average shares outstanding for diluted earnings per common share | 60,675,124 | 61,634,836 | 60,928,900 | 61,584,691

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- Definition The total amount of dividends declared in the period for each class of stock and the contractual amount of dividends (or interest on participating income bonds) that must be paid for the period (for example, unpaid cumulative dividends). Dividends declared in the current period do not include dividends declared in respect of prior-period unpaid cumulative dividends. Preferred dividends that are cumulative only if earned are deducted only to the extent that they are earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780133-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60A -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780132-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2740-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 66 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2814-109256 + Details
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