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Condensed Parent Company Financial Statements - Summary of Balance Sheet of Parent Company (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
ASSETS
Cash	$ 203,545us-gaap_CashAndDueFromBanks	$ 196,547us-gaap_CashAndDueFromBanks
Securities	524,783us-gaap_MarketableSecurities	527,627us-gaap_MarketableSecurities
Goodwill	44,962us-gaap_Goodwill	44,545us-gaap_Goodwill
Total assets	6,574,972us-gaap_Assets	6,038,974us-gaap_Assets	6,022,250us-gaap_Assets
LIABILITIES AND STOCKHOLDERS’ EQUITY
Other liabilities	30,168us-gaap_OtherLiabilities	24,126us-gaap_OtherLiabilities
Junior subordinated debentures	26,804us-gaap_JuniorSubordinatedNotes	26,804us-gaap_JuniorSubordinatedNotes
Stockholders’ equity	609,314us-gaap_StockholdersEquity	556,997us-gaap_StockholdersEquity	519,567us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity	6,574,972us-gaap_LiabilitiesAndStockholdersEquity	6,038,974us-gaap_LiabilitiesAndStockholdersEquity
Parent Company [Member]
ASSETS
Cash	36,700us-gaap_CashAndDueFromBanks / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	27,592us-gaap_CashAndDueFromBanks / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Securities	103us-gaap_MarketableSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	115us-gaap_MarketableSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Investments in subsidiaries	598,413us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	555,761us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Goodwill	450us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	450us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Dividends receivable	6,434us-gaap_DividendsReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	5,927us-gaap_DividendsReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other assets	983us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	913us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total assets	643,083us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	590,758us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
LIABILITIES AND STOCKHOLDERS’ EQUITY
Other liabilities	6,965us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	6,957us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Junior subordinated debentures	26,804us-gaap_JuniorSubordinatedNotes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	26,804us-gaap_JuniorSubordinatedNotes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Stockholders’ equity	609,314us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	556,997us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total liabilities and stockholders’ equity	$ 643,083us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 590,758us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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