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Earnings Per Common Share - Basic and Diluted Earnings Per Common Share (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Earnings Per Share [Abstract] |  |  |  |
Net income | $ 71,479 | $ 73,077 | $ 140,258 | $ 145,240
Less: Preferred stock dividends | 2,015 | 2,015 | 4,031 | 4,031
Net income available to common shareholders | 69,464 | 71,062 | 136,227 | 141,209
Less: Earnings allocated to participating securities | 252 | 247 | 487 | 484
Distributed earnings allocated to common stock | 33,463 | 33,465 | 66,285 | 65,644
Undistributed earnings allocated to common stock | 35,749 | 37,350 | 69,455 | 75,081
Net earnings allocated to common stock | $ 69,212 | $ 70,815 | $ 135,740 | $ 140,725
Weighted-average shares outstanding for basic earnings per common share | 61,959,411 | 63,118,785 | 61,944,438 | 63,106,656
Dilutive effect of stock compensation | 538,217 | 831,938 | 387,096 | 760,331
Weighted-average shares outstanding for diluted earnings per common share | 62,497,628 | 63,950,723 | 62,331,534 | 63,866,987

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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=64863997&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=64863997&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=64863997&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=64863997&loc=d3e2814-109256 + Details
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 28A -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1500-109256 + Details
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