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Earnings Per Share - Reconciles Numerator and Denominator of Basic and Diluted Earnings Per Share Computations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Numerator for EPS: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 20,972us-gaap_NetIncomeLoss | $ 21,341us-gaap_NetIncomeLoss | $ 17,126us-gaap_NetIncomeLoss | $ 13,549us-gaap_NetIncomeLoss | $ 15,582us-gaap_NetIncomeLoss | $ 14,407us-gaap_NetIncomeLoss | $ 17,029us-gaap_NetIncomeLoss | $ 11,959us-gaap_NetIncomeLoss | $ 72,988us-gaap_NetIncomeLoss | $ 58,977us-gaap_NetIncomeLoss | $ 30,312us-gaap_NetIncomeLoss
Less: Preferred stock dividends |  |  |  |  |  |  |  |  | (13)us-gaap_PreferredStockDividendsIncomeStatementImpact | (29)us-gaap_PreferredStockDividendsIncomeStatementImpact | (287)us-gaap_PreferredStockDividendsIncomeStatementImpact
Income available to common stockholders |  |  |  |  |  |  |  |  | $ 72,975us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 58,948us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 30,025us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator for EPS: |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  |  |  |  |  |  |  | 33,569us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 35,866us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 39,614us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Plus: Assumed conversion of stock-based compensation |  |  |  |  |  |  |  |  | 1,535us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 1,531us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 513us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Assumed conversion of preferred stock |  |  |  |  |  |  |  |  | 46us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock | 379us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock | 489us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock
Weighted average diluted common shares outstanding |  |  |  |  |  |  |  |  | 35,150us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 37,776us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 40,616us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per common share | $ 0.63us-gaap_EarningsPerShareBasic | $ 0.64us-gaap_EarningsPerShareBasic | $ 0.50us-gaap_EarningsPerShareBasic | $ 0.41us-gaap_EarningsPerShareBasic | $ 0.46us-gaap_EarningsPerShareBasic | $ 0.43us-gaap_EarningsPerShareBasic | $ 0.47us-gaap_EarningsPerShareBasic | $ 0.30us-gaap_EarningsPerShareBasic | $ 2.17us-gaap_EarningsPerShareBasic | $ 1.64us-gaap_EarningsPerShareBasic | $ 0.76us-gaap_EarningsPerShareBasic
Diluted earnings per common share | $ 0.59us-gaap_EarningsPerShareDiluted | $ 0.61us-gaap_EarningsPerShareDiluted | $ 0.49us-gaap_EarningsPerShareDiluted | $ 0.38us-gaap_EarningsPerShareDiluted | $ 0.44us-gaap_EarningsPerShareDiluted | $ 0.40us-gaap_EarningsPerShareDiluted | $ 0.44us-gaap_EarningsPerShareDiluted | $ 0.29us-gaap_EarningsPerShareDiluted | $ 2.08us-gaap_EarningsPerShareDiluted | $ 1.56us-gaap_EarningsPerShareDiluted | $ 0.75us-gaap_EarningsPerShareDiluted
Weighted average number of antidilutive shares |  |  |  |  |  |  |  |  | 64us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 518us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 818us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + 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 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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