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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
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

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