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Loans and Allowance for Loan Losses - Internal Loan Grading by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | $ 3,245,084 | $ 3,242,427 | $ 3,065,439
Non-residential real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 1,251,324 |  | 1,141,051
Residential real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 792,754 |  | 721,149
Non-consumer non-real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 749,662 |  | 697,416
Consumer non-real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 217,380 |  | 200,427
Other loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 147,505 |  | 155,984
Acquired loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 86,459 |  | 149,412
Grade 1 [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 2,762,056 |  | 2,662,879
Grade 1 [Member] | Non-residential real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 1,032,002 |  | 983,946
Grade 1 [Member] | Residential real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 667,217 |  | 619,115
Grade 1 [Member] | Non-consumer non-real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 649,542 |  | 610,214
Grade 1 [Member] | Consumer non-real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 203,408 |  | 187,768
Grade 1 [Member] | Other loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 143,653 |  | 151,330
Grade 1 [Member] | Acquired loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 66,234 |  | 110,506
Grade 2 [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 413,988 |  | 319,097
Grade 2 [Member] | Non-residential real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 183,754 |  | 118,825
Grade 2 [Member] | Residential real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 108,006 |  | 81,324
Grade 2 [Member] | Non-consumer non-real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 94,045 |  | 78,825
Grade 2 [Member] | Consumer non-real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 11,767 |  | 10,204
Grade 2 [Member] | Other loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 2,642 |  | 2,917
Grade 2 [Member] | Acquired loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 13,774 |  | 27,002
Grade 3 [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 50,757 |  | 62,692
Grade 3 [Member] | Non-residential real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 25,686 |  | 28,514
Grade 3 [Member] | Residential real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 13,716 |  | 15,920
Grade 3 [Member] | Non-consumer non-real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 4,737 |  | 7,211
Grade 3 [Member] | Consumer non-real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 1,860 |  | 2,122
Grade 3 [Member] | Other loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 864 |  | 1,027
Grade 3 [Member] | Acquired loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 3,894 |  | 7,898
Grade 4 [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 18,280 |  | 20,771
Grade 4 [Member] | Non-residential real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 9,882 |  | 9,766
Grade 4 [Member] | Residential real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 3,815 |  | 4,790
Grade 4 [Member] | Non-consumer non-real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 1,338 |  | 1,166
Grade 4 [Member] | Consumer non-real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 342 |  | 333
Grade 4 [Member] | Other loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 346 |  | 710
Grade 4 [Member] | Acquired loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 2,557 |  | 4,006
Grade 5 [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 3 |  |
Grade 5 [Member] | Consumer non-real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | $ 3 |  |

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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