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Loans - Allowance for Loan Losses (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | $ 16,674 | $ 13,897 | $ 16,234 | $ 14,060
Charge-offs | (830) | (1,583) | (1,480) | (2,752)
Recoveries | 70 | 71 | 141 | 147
Provision (benefit) for loan losses | 1,501 | 3,115 | 2,520 | 4,045
Allowances for loan losses, Ending Balance | 17,415 | 15,500 | 17,415 | 15,500
Commercial, Industrial, and Agricultural [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 8,278 | 5,271 | 8,212 | 4,940
Charge-offs | (319) | (84) | (319) | (84)
Recoveries | 1 | 7 | 1 | 7
Provision (benefit) for loan losses | 136 | 144 | 202 | 475
Allowances for loan losses, Ending Balance | 8,096 | 5,338 | 8,096 | 5,338
Commercial Mortgages [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 3,704 | 4,299 | 3,536 | 4,697
Charge-offs | 0 | (923) | (50) | (1,530)
Recoveries | 10 | 2 | 10 | 3
Provision (benefit) for loan losses | 867 | 2,518 | 1,085 | 2,726
Allowances for loan losses, Ending Balance | 4,581 | 5,896 | 4,581 | 5,896
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 2,455 | 2,395 | 2,450 | 2,466
Charge-offs | (76) | (169) | (198) | (341)
Recoveries | 0 | 3 | 19 | 4
Provision (benefit) for loan losses | 88 | 279 | 196 | 379
Allowances for loan losses, Ending Balance | 2,467 | 2,508 | 2,467 | 2,508
Consumer [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 1,972 | 1,707 | 1,763 | 1,699
Charge-offs | (369) | (346) | (768) | (677)
Recoveries | 31 | 33 | 53 | 74
Provision (benefit) for loan losses | 362 | 161 | 948 | 459
Allowances for loan losses, Ending Balance | 1,996 | 1,555 | 1,996 | 1,555
Credit Cards [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 68 | 77 | 66 | 83
Charge-offs | (2) | (17) | (23) | (29)
Recoveries | 1 | 8 | 3 | 10
Provision (benefit) for loan losses | 21 | (13) | 42 | (9)
Allowances for loan losses, Ending Balance | 88 | 55 | 88 | 55
Overdrafts [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowances for loan losses, Beginning Balance | 197 | 148 | 207 | 175
Charge-offs | (64) | (44) | (122) | (91)
Recoveries | 27 | 18 | 55 | 49
Provision (benefit) for loan losses | 27 | 26 | 47 | 15
Allowances for loan losses, Ending Balance | $ 187 | $ 148 | $ 187 | $ 148

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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=35738203&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + 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)(4) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + 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)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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