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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
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

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