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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, 2014 | Dec. 31, 2013 | Jun. 30, 2013
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | $ 3,665,908 | $ 3,387,146 | $ 3,245,084
Non-residential real estate owner occupied [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 482,822 |  | 446,217
Non-residential real estate other [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 926,154 |  | 805,107
Residential real estate permanent mortgage [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 285,629 |  | 251,733
Residential real estate all other [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 600,891 |  | 541,021
Non-consumer non-real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 862,056 |  | 749,662
Consumer non-real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 233,343 |  | 217,380
Other loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 148,269 |  | 147,505
Acquired loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 126,744 |  | 86,459
Grade 1 [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 3,034,452 |  | 2,762,056
Grade 1 [Member] | Non-residential real estate owner occupied [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 406,862 |  | 381,580
Grade 1 [Member] | Non-residential real estate other [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 736,119 |  | 650,422
Grade 1 [Member] | Residential real estate permanent mortgage [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 253,932 |  | 212,230
Grade 1 [Member] | Residential real estate all other [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 501,090 |  | 454,987
Grade 1 [Member] | Non-consumer non-real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 704,671 |  | 649,542
Grade 1 [Member] | Consumer non-real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 220,053 |  | 203,408
Grade 1 [Member] | Other loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 145,004 |  | 143,653
Grade 1 [Member] | Acquired loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 66,721 |  | 66,234
Grade 2 [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 522,942 |  | 413,988
Grade 2 [Member] | Non-residential real estate owner occupied [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 69,202 |  | 58,923
Grade 2 [Member] | Non-residential real estate other [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 165,012 |  | 124,831
Grade 2 [Member] | Residential real estate permanent mortgage [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 24,765 |  | 33,024
Grade 2 [Member] | Residential real estate all other [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 91,707 |  | 74,982
Grade 2 [Member] | Non-consumer non-real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 115,925 |  | 94,045
Grade 2 [Member] | Consumer non-real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 11,160 |  | 11,767
Grade 2 [Member] | Other loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 2,373 |  | 2,642
Grade 2 [Member] | Acquired loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 42,798 |  | 13,774
Grade 3 [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 89,854 |  | 50,757
Grade 3 [Member] | Non-residential real estate owner occupied [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 6,375 |  | 5,077
Grade 3 [Member] | Non-residential real estate other [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 19,587 |  | 20,609
Grade 3 [Member] | Residential real estate permanent mortgage [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 5,967 |  | 5,593
Grade 3 [Member] | Residential real estate all other [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 6,859 |  | 8,123
Grade 3 [Member] | Non-consumer non-real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 40,135 |  | 4,737
Grade 3 [Member] | Consumer non-real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 1,637 |  | 1,860
Grade 3 [Member] | Other loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 615 |  | 864
Grade 3 [Member] | Acquired loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 8,679 |  | 3,894
Grade 4 [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 18,061 |  | 18,280
Grade 4 [Member] | Non-residential real estate owner occupied [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 383 |  | 637
Grade 4 [Member] | Non-residential real estate other [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 5,436 |  | 9,245
Grade 4 [Member] | Residential real estate permanent mortgage [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 965 |  | 886
Grade 4 [Member] | Residential real estate all other [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 1,235 |  | 2,929
Grade 4 [Member] | Non-consumer non-real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 1,325 |  | 1,338
Grade 4 [Member] | Consumer non-real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 493 |  | 342
Grade 4 [Member] | Other loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 87 |  | 346
Grade 4 [Member] | Acquired loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 8,137 |  | 2,557
Grade 5 [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 599 |  | 3
Grade 5 [Member] | Non-residential real estate owner occupied [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 0 |  | 0
Grade 5 [Member] | Non-residential real estate other [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 0 |  | 0
Grade 5 [Member] | Residential real estate permanent mortgage [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 0 |  | 0
Grade 5 [Member] | Residential real estate all other [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 0 |  | 0
Grade 5 [Member] | Non-consumer non-real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 0 |  | 0
Grade 5 [Member] | Consumer non-real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 0 |  | 3
Grade 5 [Member] | Other loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 190 |  | 0
Grade 5 [Member] | Acquired loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | $ 409 |  | $ 0

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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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