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Loans - Aging of Recorded Investment in Past Due Loans (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | $ 2,752 | $ 4,039
60-89 Days Past Due | 1,761 | 4,207
Greater Than 90 Days Past Due | 10,964 | 14,587
Total Past Due | 15,477 | 22,833
Loans Not Past Due | 1,013,494 | 904,991
Total | 1,032,875 | 931,225
Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 126 | 724
60-89 Days Past Due | 523 | 157
Greater Than 90 Days Past Due | 2,478 | 2,968
Total Past Due | 3,127 | 3,849
Loans Not Past Due | 255,762 | 253,242
Total | 258,889 | 257,091
Commercial Mortgages [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 1,173 | 1,162
60-89 Days Past Due | 0 | 3,197
Greater Than 90 Days Past Due | 5,784 | 8,679
Total Past Due | 6,957 | 13,038
Loans Not Past Due | 298,883 | 248,753
Total | 305,840 | 261,791
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 860 | 1,390
60-89 Days Past Due | 949 | 641
Greater Than 90 Days Past Due | 1,954 | 2,700
Total Past Due | 3,763 | 4,731
Loans Not Past Due | 396,886 | 343,173
Total | 400,649 | 347,904
Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 569 | 724
60-89 Days Past Due | 266 | 203
Greater Than 90 Days Past Due | 694 | 227
Total Past Due | 1,529 | 1,154
Loans Not Past Due | 56,754 | 54,113
Total | 58,283 | 55,267
Credit Cards [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 24 | 39
60-89 Days Past Due | 23 | 9
Greater Than 90 Days Past Due | 54 | 13
Total Past Due | 101 | 61
Loans Not Past Due | 4,699 | 4,739
Total | 4,800 | 4,800
Overdrafts [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 0 | 0
60-89 Days Past Due | 0 | 0
Greater Than 90 Days Past Due | 0 | 0
Total Past Due | 0 | 0
Loans Not Past Due | 510 | 971
Total | $ 510 | $ 971

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- Definition Financing receivable recorded investment loans not past due. + References No definition available. + Details
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- Definition Financing receivables that are less than 60 days past due but more than 29 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are less than 90 days past due but more than 59 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are equal to or greater than 90 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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- Details
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- Definition 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 + Details
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