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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
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Financing Receivable, Recorded Investment [Line Items] |  |
Residential real estate | $ 502,317 us-gaap_LoansAndLeasesReceivableConsumerRealEstate | $ 459,114 us-gaap_LoansAndLeasesReceivableConsumerRealEstate
Consumer | 69,648 us-gaap_LoansAndLeasesReceivableConsumer | 63,491 us-gaap_LoansAndLeasesReceivableConsumer
Credit cards | 5,233 us-gaap_LoansAndLeasesReceivableConsumerRevolvingCreditCard | 5,065 us-gaap_LoansAndLeasesReceivableConsumerRevolvingCreditCard
Performing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Residential real estate | 499,078 us-gaap_LoansAndLeasesReceivableConsumerRealEstate / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | 456,575 us-gaap_LoansAndLeasesReceivableConsumerRealEstate / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember
Consumer | 68,603 us-gaap_LoansAndLeasesReceivableConsumer / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | 62,379 us-gaap_LoansAndLeasesReceivableConsumer / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember
Credit cards | 5,233 us-gaap_LoansAndLeasesReceivableConsumerRevolvingCreditCard / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | 5,041 us-gaap_LoansAndLeasesReceivableConsumerRevolvingCreditCard / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember
Non-Performing [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Residential real estate | 3,239 us-gaap_LoansAndLeasesReceivableConsumerRealEstate / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember | 2,539 us-gaap_LoansAndLeasesReceivableConsumerRealEstate / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember
Consumer | 1,045 us-gaap_LoansAndLeasesReceivableConsumer / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember | 1,112 us-gaap_LoansAndLeasesReceivableConsumer / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember
Credit cards | $ 0 us-gaap_LoansAndLeasesReceivableConsumerRevolvingCreditCard / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember | $ 24 us-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 + Details
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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 + Details
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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 + Details
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