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Troubled Debt Restructurings by Accrual Status (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	$ 294,478	$ 286,236
Residential
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	107,508	108,603
Construction
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	9,018	11,763
Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	76,666	68,902
Commercial Business
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	22,003	18,655
Home Equity and Second Mortgage
Financing Receivable, Modifications [Line Items]
Recorded investment in loans	35,269	37,286
Troubled Debt Restructuring
Financing Receivable, Modifications [Line Items]
Accruing	1,662	221
Nonaccrual	1,935	4,099
Recorded investment in loans	3,597	4,320
Related Allowance for Loan Losses	1,304	1,293
Troubled Debt Restructuring | Residential
Financing Receivable, Modifications [Line Items]
Accruing	508	180
Nonaccrual	226	588
Recorded investment in loans	734	768
Related Allowance for Loan Losses	45	87
Troubled Debt Restructuring | Construction
Financing Receivable, Modifications [Line Items]
Accruing	0	0
Nonaccrual	0	170
Recorded investment in loans	0	170
Related Allowance for Loan Losses	0	0
Troubled Debt Restructuring | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Accruing	1,130	0
Nonaccrual	0	1,534
Recorded investment in loans	1,130	1,534
Related Allowance for Loan Losses	0	83
Troubled Debt Restructuring | Commercial Business
Financing Receivable, Modifications [Line Items]
Accruing	0	0
Nonaccrual	1,709	1,776
Recorded investment in loans	1,709	1,776
Related Allowance for Loan Losses	1,259	1,098
Troubled Debt Restructuring | Home Equity and Second Mortgage
Financing Receivable, Modifications [Line Items]
Accruing	24	41
Nonaccrual	0	31
Recorded investment in loans	24	72
Related Allowance for Loan Losses	$ 0	$ 25

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for 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 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)(1)(ii)

-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

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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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Reflects the carrying amount of loans deemed to be questionable as to collection on which interest is continuing to be earned or accrued.

+ References

No definition available.

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Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5111-111524

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