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Loans - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Ending allowance balance attributable to loans: |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | $ 847 | $ 427 |  |
Allowance for loan losses, Collectively evaluated for impairment | 14,447 | 14,352 |  |
Acquired with deteriorated credit quality | 0 | 0 |  |
Allowance for loan losses, Modified in a troubled debt restructuring | 1,380 | 1,455 |  |
Total ending allowance balance | 16,674 | 16,234 | 13,897 | 14,060
Loans: |  |  |  |
Loans individually evaluated for impairment | 5,710 | 6,172 |  |
Loans collectively evaluated for impairment | 1,278,024 | 1,278,726 |  |
Acquired with deteriorated credit quality | 2,195 | 2,225 |  |
Loans modified in a troubled debt restructuring | 11,945 | 12,136 |  |
Total ending loans balance | 1,297,874 | 1,299,259 |  |
Commercial, Industrial, and Agricultural [Member] |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 847 | 372 |  |
Allowance for loan losses, Collectively evaluated for impairment | 6,168 | 5,907 |  |
Acquired with deteriorated credit quality | 0 | 0 |  |
Allowance for loan losses, Modified in a troubled debt restructuring | 113 | 115 |  |
Total ending allowance balance | 7,128 | 6,394 | 5,271 | 4,940
Loans: |  |  |  |
Loans individually evaluated for impairment | 5,122 | 4,923 |  |
Loans collectively evaluated for impairment | 354,273 | 351,002 |  |
Acquired with deteriorated credit quality | 0 | 0 |  |
Loans modified in a troubled debt restructuring | 1,745 | 1,790 |  |
Total ending loans balance | 361,140 | 357,715 |  |
Commercial Mortgages [Member] |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 0 | 55 |  |
Allowance for loan losses, Collectively evaluated for impairment | 3,467 | 3,959 |  |
Acquired with deteriorated credit quality | 0 | 0 |  |
Allowance for loan losses, Modified in a troubled debt restructuring | 1,267 | 1,340 |  |
Total ending allowance balance | 4,734 | 5,354 | 4,299 | 4,697
Loans: |  |  |  |
Loans individually evaluated for impairment | 588 | 1,249 |  |
Loans collectively evaluated for impairment | 396,777 | 399,645 |  |
Acquired with deteriorated credit quality | 2,195 | 2,225 |  |
Loans modified in a troubled debt restructuring | 10,200 | 10,346 |  |
Total ending loans balance | 409,760 | 413,465 |  |
Residential Real Estate [Member] |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 0 | 0 |  |
Allowance for loan losses, Collectively evaluated for impairment | 2,575 | 2,880 |  |
Acquired with deteriorated credit quality | 0 | 0 |  |
Allowance for loan losses, Modified in a troubled debt restructuring | 0 | 0 |  |
Total ending allowance balance | 2,575 | 2,880 | 2,395 | 2,466
Loans: |  |  |  |
Loans individually evaluated for impairment | 0 | 0 |  |
Loans collectively evaluated for impairment | 459,667 | 459,114 |  |
Acquired with deteriorated credit quality | 0 | 0 |  |
Loans modified in a troubled debt restructuring | 0 | 0 |  |
Total ending loans balance | 459,667 | 459,114 |  |
Consumer [Member] |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 0 | 0 |  |
Allowance for loan losses, Collectively evaluated for impairment | 1,972 | 1,333 |  |
Acquired with deteriorated credit quality | 0 | 0 |  |
Allowance for loan losses, Modified in a troubled debt restructuring | 0 | 0 |  |
Total ending allowance balance | 1,972 | 1,333 | 1,707 | 1,699
Loans: |  |  |  |
Loans individually evaluated for impairment | 0 | 0 |  |
Loans collectively evaluated for impairment | 62,007 | 63,491 |  |
Acquired with deteriorated credit quality | 0 | 0 |  |
Loans modified in a troubled debt restructuring | 0 | 0 |  |
Total ending loans balance | 62,007 | 63,491 |  |
Credit Cards [Member] |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 0 | 0 |  |
Allowance for loan losses, Collectively evaluated for impairment | 68 | 66 |  |
Acquired with deteriorated credit quality | 0 | 0 |  |
Allowance for loan losses, Modified in a troubled debt restructuring | 0 | 0 |  |
Total ending allowance balance | 68 | 66 | 77 | 83
Loans: |  |  |  |
Loans individually evaluated for impairment | 0 | 0 |  |
Loans collectively evaluated for impairment | 4,879 | 5,065 |  |
Acquired with deteriorated credit quality | 0 | 0 |  |
Loans modified in a troubled debt restructuring | 0 | 0 |  |
Total ending loans balance | 4,879 | 5,065 |  |
Overdrafts [Member] |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Allowance for loan losses, Individually evaluated for impairment | 0 | 0 |  |
Allowance for loan losses, Collectively evaluated for impairment | 197 | 207 |  |
Acquired with deteriorated credit quality | 0 | 0 |  |
Allowance for loan losses, Modified in a troubled debt restructuring | 0 | 0 |  |
Total ending allowance balance | 197 | 207 | 148 | 175
Loans: |  |  |  |
Loans individually evaluated for impairment | 0 | 0 |  |
Loans collectively evaluated for impairment | 421 | 409 |  |
Acquired with deteriorated credit quality | 0 | 0 |  |
Loans modified in a troubled debt restructuring | 0 | 0 |  |
Total ending loans balance | $ 421 | $ 409 |  |

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- Definition The balance of financing receivables that were acquired with deteriorated credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: 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 2: 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)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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