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Loans and Allowance for Loan Losses - Loans Outstanding by Impairment Methodology (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | $ 88,401 | $ 76,758
Collectively evaluated for impairment | 3,858,081 | 3,756,419
Receivables Acquired with Deteriorated Credit Quality [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans acquired with deteriorated credit quality | 13,187 | 18,221
Non-residential Real Estate Owner Occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 6,846 | 5,374
Collectively evaluated for impairment | 486,432 | 478,261
Non-residential Real Estate Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 34,900 | 25,251
Collectively evaluated for impairment | 1,002,339 | 928,752
Residential Real Estate Permanent Mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 7,181 | 7,313
Collectively evaluated for impairment | 317,956 | 300,266
Residential Real Estate All Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 11,807 | 8,319
Collectively evaluated for impairment | 651,228 | 628,769
Non-consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 25,302 | 28,156
Collectively evaluated for impairment | 909,100 | 938,551
Consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 2,199 | 2,112
Collectively evaluated for impairment | 266,169 | 245,653
Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 166 | 233
Collectively evaluated for impairment | 161,160 | 152,751
Acquired Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Collectively evaluated for impairment | 63,697 | 83,416
Acquired Loans [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans acquired with deteriorated credit quality | $ 13,187 | $ 18,221

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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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