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Loans and Allowance for Loan Losses - Activity in Alll by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | $ 38,725 |  |  |  | $ 37,656 | $ 38,725 | $ 37,656 |
Charge-offs |  |  |  |  |  |  |  |  | (1,560) | (2,644) |
Recoveries |  |  |  |  |  |  |  |  | 611 | 613 |
Net charge-offs |  |  |  |  |  |  |  |  | (949) | (2,031) |
Provisions charged to operations | 454 | (12) | 516 | 300 | 2,446 | 233 | 248 | 173 | 1,258 | 3,100 | 4,515
Balance at end of period | 39,034 |  |  |  | 38,725 |  |  |  | 39,034 | 38,725 | 37,656
Non-residential real estate owner occupied [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 5,104 |  |  |  | 5,300 | 5,104 | 5,300 |
Charge-offs |  |  |  |  |  |  |  |  | (3) | (96) |
Recoveries |  |  |  |  |  |  |  |  | 20 | 3 |
Net charge-offs |  |  |  |  |  |  |  |  | 17 | (93) |
Provisions charged to operations |  |  |  |  |  |  |  |  | (294) | (103) |
Balance at end of period | 4,827 |  |  |  | 5,104 |  |  |  | 4,827 | 5,104 |
Non-residential real estate other [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 9,865 |  |  |  | 8,648 | 9,865 | 8,648 |
Charge-offs |  |  |  |  |  |  |  |  | (19) | (195) |
Recoveries |  |  |  |  |  |  |  |  | 12 | 53 |
Net charge-offs |  |  |  |  |  |  |  |  | (7) | (142) |
Provisions charged to operations |  |  |  |  |  |  |  |  | 1,168 | 1,359 |
Balance at end of period | 11,026 |  |  |  | 9,865 |  |  |  | 11,026 | 9,865 |
Residential real estate primary mortgage [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 2,781 |  |  |  | 2,734 | 2,781 | 2,734 |
Charge-offs |  |  |  |  |  |  |  |  | (162) | (222) |
Recoveries |  |  |  |  |  |  |  |  | 32 | 85 |
Net charge-offs |  |  |  |  |  |  |  |  | (130) | (137) |
Provisions charged to operations |  |  |  |  |  |  |  |  | 174 | 184 |
Balance at end of period | 2,825 |  |  |  | 2,781 |  |  |  | 2,825 | 2,781 |
Residential real estate all other [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 7,034 |  |  |  | 7,030 | 7,034 | 7,030 |
Charge-offs |  |  |  |  |  |  |  |  | (209) | (394) |
Recoveries |  |  |  |  |  |  |  |  | 33 | 49 |
Net charge-offs |  |  |  |  |  |  |  |  | (176) | (345) |
Provisions charged to operations |  |  |  |  |  |  |  |  | (150) | 349 |
Balance at end of period | 6,708 |  |  |  | 7,034 |  |  |  | 6,708 | 7,034 |
Non-consumer non-real estate [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 9,385 |  |  |  | 9,156 | 9,385 | 9,156 |
Charge-offs |  |  |  |  |  |  |  |  | (217) | (590) |
Recoveries |  |  |  |  |  |  |  |  | 175 | 171 |
Net charge-offs |  |  |  |  |  |  |  |  | (42) | (419) |
Provisions charged to operations |  |  |  |  |  |  |  |  | (366) | 648 |
Balance at end of period | 8,977 |  |  |  | 9,385 |  |  |  | 8,977 | 9,385 |
Consumer non-real estate [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 2,451 |  |  |  | 2,315 | 2,451 | 2,315 |
Charge-offs |  |  |  |  |  |  |  |  | (597) | (509) |
Recoveries |  |  |  |  |  |  |  |  | 225 | 194 |
Net charge-offs |  |  |  |  |  |  |  |  | (372) | (315) |
Provisions charged to operations |  |  |  |  |  |  |  |  | 477 | 451 |
Balance at end of period | 2,556 |  |  |  | 2,451 |  |  |  | 2,556 | 2,451 |
Other loans [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 1,885 |  |  |  | 1,886 | 1,885 | 1,886 |
Charge-offs |  |  |  |  |  |  |  |  | (300) | (265) |
Recoveries |  |  |  |  |  |  |  |  | 75 | 34 |
Net charge-offs |  |  |  |  |  |  |  |  | (225) | (231) |
Provisions charged to operations |  |  |  |  |  |  |  |  | 331 | 230 |
Balance at end of period | 1,991 |  |  |  | 1,885 |  |  |  | 1,991 | 1,885 |
Acquired loans [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 220 |  |  |  | 587 | 220 | 587 |
Charge-offs |  |  |  |  |  |  |  |  | (53) | (373) |
Recoveries |  |  |  |  |  |  |  |  | 39 | 24 |
Net charge-offs |  |  |  |  |  |  |  |  | (14) | (349) |
Provisions charged to operations |  |  |  |  |  |  |  |  | (82) | (18) |
Balance at end of period | $ 124 |  |  |  | $ 220 |  |  |  | $ 124 | $ 220 |

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- Definition Amount of other addition (reduction) in allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524 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(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 + 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=28368275&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=28368275&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + 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 + Details
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