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Loans and Allowance for Loan Losses - Internal Loan Grading by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 3,387,146	$ 3,242,427
Non-residential real estate owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	455,032	480,654
Non-residential real estate other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	863,382	741,591
Residential real estate primary mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	265,980	248,897
Residential real estate all other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	567,873	506,036
Non-consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	795,315	785,123
Consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	228,335	221,747
Other loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	145,356	149,897
Acquired loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	65,873	108,482
Grade 1 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	2,898,156	2,791,300
Grade 1 [Member] | Non-residential real estate owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	382,798	409,187
Grade 1 [Member] | Non-residential real estate other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	711,081	611,060
Grade 1 [Member] | Residential real estate primary mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	233,924	208,254
Grade 1 [Member] | Residential real estate all other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	475,421	440,623
Grade 1 [Member] | Non-consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	691,772	684,740
Grade 1 [Member] | Consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	214,153	209,182
Grade 1 [Member] | Other loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	141,787	145,239
Grade 1 [Member] | Acquired loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	47,220	83,015
Grade 2 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	423,378	375,584
Grade 2 [Member] | Non-residential real estate owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	66,139	65,303
Grade 2 [Member] | Non-residential real estate other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	125,617	99,929
Grade 2 [Member] | Residential real estate primary mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	24,882	34,038
Grade 2 [Member] | Residential real estate all other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	82,571	52,526
Grade 2 [Member] | Non-consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	97,812	92,784
Grade 2 [Member] | Consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	11,819	10,305
Grade 2 [Member] | Other loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	2,558	2,575
Grade 2 [Member] | Acquired loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	11,980	18,124
Grade 3 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	51,005	56,130
Grade 3 [Member] | Non-residential real estate owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	5,446	5,750
Grade 3 [Member] | Non-residential real estate other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	20,309	21,360
Grade 3 [Member] | Residential real estate primary mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	6,081	5,925
Grade 3 [Member] | Residential real estate all other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	8,238	9,457
Grade 3 [Member] | Non-consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	4,462	6,084
Grade 3 [Member] | Consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,931	1,904
Grade 3 [Member] | Other loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	772	1,172
Grade 3 [Member] | Acquired loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	3,766	4,478
Grade 4 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	14,606	19,413
Grade 4 [Member] | Non-residential real estate owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	649	414
Grade 4 [Member] | Non-residential real estate other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	6,375	9,242
Grade 4 [Member] | Residential real estate primary mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,093	680
Grade 4 [Member] | Residential real estate all other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,643	3,430
Grade 4 [Member] | Non-consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,269	1,515
Grade 4 [Member] | Consumer non-real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	431	356
Grade 4 [Member] | Other loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	239	911
Grade 4 [Member] | Acquired loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	2,907	2,865
Grade 5 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1
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 primary 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	1
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

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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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