Commercial and Consumer Credit Exposure by Risk Attribute (Detail) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Financing Receivable, Recorded Investment [Line Items]
Commercial	$ 798,552	$ 800,253
Real Estate - Construction	142,682	163,543
Real Estate - Commercial	1,144,368	1,139,931
Real Estate Residential	256,788	269,173
Installment	63,799	69,711
Home Equity	344,457	341,310
Other	38,508	32,172
Pass
Financing Receivable, Recorded Investment [Line Items]
Commercial	739,569	731,932
Real Estate - Construction	108,989	115,988
Real Estate - Commercial	989,787	979,023
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Commercial	30,334	36,453
Real Estate - Construction	2,708	4,829
Real Estate - Commercial	57,711	63,618
Substandard
Financing Receivable, Recorded Investment [Line Items]
Commercial	28,450	31,557
Real Estate - Construction	30,985	42,726
Real Estate - Commercial	96,870	97,290
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Commercial	199	311
Real Estate - Construction	0	0
Real Estate - Commercial	0	0
Performing
Financing Receivable, Recorded Investment [Line Items]
Real Estate Residential	250,136	262,654
Installment	63,351	69,561
Home Equity	341,981	338,757
Other	38,508	32,172
Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Real Estate Residential	6,652	6,519
Installment	448	150
Home Equity	2,476	2,553
Other	$ 0	$ 0

Reflects the sum of the gross carrying amounts of the various categories of unpaid commercial loans and leases receivable, primarily issued to businesses. Includes: (1) commercial and industrial loans, consisting of general purpose loans to entities involved in producing, transporting, or merchandising products sold in the course of commerce; (2) agricultural loans consisting of borrowings used to finance major equipment and machinery purchases and expenses, livestock or crop production (including fisheries), and to supplement working capital needs of an entity engaged in farming operations; (3) mortgage loans secured by a [legal] security interest in real property [commercial building or business real property]; (4) obligation in the form of [promissory] notes, used for the funding of construction projects; (5) interbank and other loans to financial institutions for the purpose of liquidity management on the part of the borrower; (6) draws against credit facilities provided to companies involved in mortgage banking activities (warehousing); (7) amounts lent to businesses engaged in international activities (trade financing); (8) lease financings; and (9) loans to governmental entities.

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Gross amount under revolving lines of credit outstanding extended to a homeowner and collateralized by the equity in the home. Such lines of credit are generally subordinated to the homeowner's mortgage loan or loans. Loan proceeds are generally unrestricted as to use by the borrower.

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- Definition

Reflects the gross carrying amount of unpaid loans issued to individuals to acquire goods that are expected to have a useful life greater than a year, including automobiles, recreational vehicles, boats, refrigerators, washers and dryers. The loans generally are secured by the asset purchased and are typically repaid monthly in installments of principal and interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher OTS
-Name Federal Regulation (FR)
-Number Title 12
-Chapter V
-Section 563c.102
-Paragraph 8
-Subparagraph b(iii)
-Subsection I
-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 9
-Section 03
-Paragraph 7
-Subparagraph a, b

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Audit and Accounting Guide (AAG)
-Number AAG-DEP
-Chapter 8
-Paragraph 31, 32
-IssueDate 2006-05-01
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: 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=6375948&loc=d3e4428-111522

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 01-6
-Paragraph 13
-Subparagraph e
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher OTS
-Name Federal Regulation (FR)
-Number Title 12
-Chapter V
-Section 563c.102
-Subsection I
-Paragraph 8
-Subparagraph c(iii)
-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(a)(4),(b))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

- Definition

The gross carrying amount of mortgage loans to individuals. This item excludes subordinated loans such as home equity lines of credit.

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- Definition

The total gross amount of money lent to individual customers including construction financing, residential mortgage loans, and home equity lines of credit.

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- Definition

The gross amount of other loans and leases not otherwise specified in the taxonomy.

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- Definition

Reflects the gross carrying amount of unpaid loans issued to businesses to provide financing on existing land or a building, which, pursuant to terms of the underlying debt instrument, are secured at a minimum but possibly exclusively by that real property. Mortgages represent permanent financing, and are issued to replace previously existing mortgages or pay off acquisition, development and construction loans, or to provide cash to the borrower.

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