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Loans and Allowance for Loan Losses - Internal Loan Grading by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 3,542,270	$ 3,387,146	$ 3,219,967
Non-residential real estate owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	458,794		453,803
Non-residential real estate other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	879,505		790,239
Residential real estate permanent mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	273,204		248,756
Residential real estate all other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	567,747		525,037
Non-consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	828,039		750,601
Consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	225,962		211,320
Other loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	148,211		144,026
Acquired loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	160,808		96,185
Grade 1 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	2,943,976		2,773,325
Grade 1 [Member] | Non-residential real estate owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	381,290		393,152
Grade 1 [Member] | Non-residential real estate other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	724,181		649,917
Grade 1 [Member] | Residential real estate permanent mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	240,653		208,732
Grade 1 [Member] | Residential real estate all other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	474,152		461,620
Grade 1 [Member] | Non-consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	673,757		647,162
Grade 1 [Member] | Consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	212,492		198,107
Grade 1 [Member] | Other loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	144,870		139,696
Grade 1 [Member] | Acquired loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	92,581		74,939
Grade 2 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	520,907		375,201
Grade 2 [Member] | Non-residential real estate owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	70,949		55,109
Grade 2 [Member] | Non-residential real estate other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	129,390		110,186
Grade 2 [Member] | Residential real estate permanent mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	25,074		33,463
Grade 2 [Member] | Residential real estate all other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	86,033		51,181
Grade 2 [Member] | Non-consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	147,625		97,110
Grade 2 [Member] | Consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	11,388		10,912
Grade 2 [Member] | Other loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	2,375		2,304
Grade 2 [Member] | Acquired loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	48,073		14,936
Grade 3 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	59,144		51,969
Grade 3 [Member] | Non-residential real estate owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	6,052		5,142
Grade 3 [Member] | Non-residential real estate other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	20,155		20,852
Grade 3 [Member] | Residential real estate permanent mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	6,610		5,730
Grade 3 [Member] | Residential real estate all other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	6,495		8,410
Grade 3 [Member] | Non-consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	5,350		4,800
Grade 3 [Member] | Consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,655		1,923
Grade 3 [Member] | Other loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	736		1,103
Grade 3 [Member] | Acquired loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	12,091		4,009
Grade 4 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	18,097		19,468
Grade 4 [Member] | Non-residential real estate owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	503		400
Grade 4 [Member] | Non-residential real estate other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	5,779		9,284
Grade 4 [Member] | Residential real estate permanent mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	867		831
Grade 4 [Member] | Residential real estate all other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,067		3,826
Grade 4 [Member] | Non-consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,307		1,529
Grade 4 [Member] | Consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	427		374
Grade 4 [Member] | Other loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	230		923
Grade 4 [Member] | Acquired loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	7,917		2,301
Grade 5 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	146		4
Grade 5 [Member] | Non-residential real estate owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans
Grade 5 [Member] | Non-residential real estate other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans
Grade 5 [Member] | Residential real estate permanent mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans
Grade 5 [Member] | Residential real estate all other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans
Grade 5 [Member] | Non-consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans
Grade 5 [Member] | Consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans			4
Grade 5 [Member] | Other loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans
Grade 5 [Member] | Acquired loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 146

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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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