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Condensed Financial Information of Parent Company - Condensed Statements of Earnings (Detail) (USD $) In Thousands, 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
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other expense, net |  |  |  |  |  |  |  |  | $ (126,229)us-gaap_NoninterestExpense | $ (114,028)us-gaap_NoninterestExpense | $ (138,160)us-gaap_NoninterestExpense
Net earnings | 25,581 us-gaap_NetIncomeLoss | 24,295 us-gaap_NetIncomeLoss | (25,484)us-gaap_NetIncomeLoss | 28,661 us-gaap_NetIncomeLoss | 25,288 us-gaap_NetIncomeLoss | 24,239 us-gaap_NetIncomeLoss | 24,466 us-gaap_NetIncomeLoss | 21,615 us-gaap_NetIncomeLoss | 104,021 us-gaap_NetIncomeLoss | 95,608 us-gaap_NetIncomeLoss | 77,280 us-gaap_NetIncomeLoss
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Excess in net earnings of subsidiaries |  |  |  |  |  |  |  |  | 66,119 us-gaap_IncomeLossFromSubsidiariesNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 33,149 us-gaap_IncomeLossFromSubsidiariesNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,261)us-gaap_IncomeLossFromSubsidiariesNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Dividends from the Bank |  |  |  |  |  |  |  |  | 41,000 us-gaap_InvestmentIncomeDividend / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 63,000 us-gaap_InvestmentIncomeDividend / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 82,300 us-gaap_InvestmentIncomeDividend / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other expense, net |  |  |  |  |  |  |  |  | (3,098)us-gaap_NoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (541)us-gaap_NoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (3,759)us-gaap_NoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net earnings |  |  |  |  |  |  |  |  | $ 104,021 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 95,608 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 77,280 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition Amount of dividend income on nonoperating securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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