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Loans - Recorded Investment in Residential, Consumer and Credit Card Loans Based on Payment Activity (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Residential real estate	$ 502,317us-gaap_LoansAndLeasesReceivableConsumerRealEstate	$ 459,114us-gaap_LoansAndLeasesReceivableConsumerRealEstate
Consumer	69,648us-gaap_LoansAndLeasesReceivableConsumer	63,491us-gaap_LoansAndLeasesReceivableConsumer
Credit cards	5,233us-gaap_LoansAndLeasesReceivableConsumerRevolvingCreditCard	5,065us-gaap_LoansAndLeasesReceivableConsumerRevolvingCreditCard
Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Residential real estate	499,078us-gaap_LoansAndLeasesReceivableConsumerRealEstate / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember	456,575us-gaap_LoansAndLeasesReceivableConsumerRealEstate / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember
Consumer	68,603us-gaap_LoansAndLeasesReceivableConsumer / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember	62,379us-gaap_LoansAndLeasesReceivableConsumer / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember
Credit cards	5,233us-gaap_LoansAndLeasesReceivableConsumerRevolvingCreditCard / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember	5,041us-gaap_LoansAndLeasesReceivableConsumerRevolvingCreditCard / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember
Non-Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Residential real estate	3,239us-gaap_LoansAndLeasesReceivableConsumerRealEstate / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember	2,539us-gaap_LoansAndLeasesReceivableConsumerRealEstate / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember
Consumer	1,045us-gaap_LoansAndLeasesReceivableConsumer / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember	1,112us-gaap_LoansAndLeasesReceivableConsumer / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember
Credit cards	$ 0us-gaap_LoansAndLeasesReceivableConsumerRevolvingCreditCard / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember	$ 24us-gaap_LoansAndLeasesReceivableConsumerRevolvingCreditCard / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember

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- Definition

Amount before allowance of consumer loans, including, but not limited to, mortgage, home equity, vehicles, credit card, installment, and lease financing. 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



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a, b

-Article 9



Reference 3: 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),(b))

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

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- Definition

Amount before allowance of consumer real estate loans. Includes, but not limited to, construction financing, residential mortgage loans, and home equity lines of credit. 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



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a, b

-Article 9



Reference 3: 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)(2),(3),(b))

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

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- Definition

Amount before allowance of credit card loans issued to individuals. 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



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a, b

-Article 9



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a

-Article 9



Reference 4: 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

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