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Loans and Allowance for Loan Losses - Loans Outstanding by Impairment Methodology (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Financial Receivables Impaired Or Restructured [Line Items] |  |
Individually evaluated for impairment | $ 58,244 | $ 66,351
Collectively evaluated for impairment | 3,322,228 | 3,168,733
Loans acquired with deteriorated credit quality | 6,674 | 7,343
Non-residential real estate owner occupied [Member] |  |
Financial Receivables Impaired Or Restructured [Line Items] |  |
Individually evaluated for impairment | 6,095 | 6,163
Collectively evaluated for impairment | 448,937 | 474,491
Loans acquired with deteriorated credit quality |  |
Non-residential real estate other [Member] |  |
Financial Receivables Impaired Or Restructured [Line Items] |  |
Individually evaluated for impairment | 26,684 | 30,602
Collectively evaluated for impairment | 836,698 | 710,989
Loans acquired with deteriorated credit quality |  |
Residential real estate primary mortgage [Member] |  |
Financial Receivables Impaired Or Restructured [Line Items] |  |
Individually evaluated for impairment | 7,174 | 6,605
Collectively evaluated for impairment | 258,806 | 242,292
Loans acquired with deteriorated credit quality |  |
Residential real estate all other [Member] |  |
Financial Receivables Impaired Or Restructured [Line Items] |  |
Individually evaluated for impairment | 9,881 | 12,887
Collectively evaluated for impairment | 557,992 | 493,149
Loans acquired with deteriorated credit quality |  |
Non-consumer non-real estate [Member] |  |
Financial Receivables Impaired Or Restructured [Line Items] |  |
Individually evaluated for impairment | 5,731 | 7,599
Collectively evaluated for impairment | 789,584 | 777,524
Loans acquired with deteriorated credit quality |  |
Consumer non-real estate [Member] |  |
Financial Receivables Impaired Or Restructured [Line Items] |  |
Individually evaluated for impairment | 2,362 | 2,260
Collectively evaluated for impairment | 225,972 | 219,487
Loans acquired with deteriorated credit quality |  |
Other loans [Member] |  |
Financial Receivables Impaired Or Restructured [Line Items] |  |
Individually evaluated for impairment | 317 | 235
Collectively evaluated for impairment | 145,039 | 149,662
Loans acquired with deteriorated credit quality |  |
Acquired loans [Member] |  |
Financial Receivables Impaired Or Restructured [Line Items] |  |
Individually evaluated for impairment |  |
Collectively evaluated for impairment | 59,200 | 101,139
Loans acquired with deteriorated credit quality | $ 6,674 | $ 7,343

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- Definition The balance of financing receivables that were acquired with deteriorated credit quality. + 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=28368275&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually 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=28368275&loc=SL6953423-111524 + Details
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