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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Beginning Balance | $ 38,982 | $ 37,436 | $ 38,725 | $ 37,656
Charge-offs | (330) | (500) | (1,210) | (1,563)
Recoveries | 219 | 89 | 540 | 511
Net charge-offs | (111) | (411) | (670) | (1,052)
Provisions charged to operations | (12) | 233 | 804 | 654
Ending Balance | 38,859 | 37,258 | 38,859 | 37,258
Non-residential real estate owner occupied [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Beginning Balance | 4,714 | 5,783 | 5,104 | 5,300
Charge-offs | (1) | (30) | (3) | (87)
Recoveries |  | 2 | 16 | 2
Net charge-offs | (1) | (28) | 13 | (85)
Provisions charged to operations | 144 | (469) | (260) | 71
Ending Balance | 4,857 | 5,286 | 4,857 | 5,286
Non-residential real estate other [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Beginning Balance | 10,866 | 8,566 | 9,865 | 8,648
Charge-offs |  |  | (19) | (71)
Recoveries | 2 | 15 | 12 | 46
Net charge-offs | 2 | 15 | (7) | (25)
Provisions charged to operations | 404 | 16 | 1,414 | (26)
Ending Balance | 11,272 | 8,597 | 11,272 | 8,597
Residential real estate permanent mortgage [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Beginning Balance | 2,733 | 3,002 | 2,781 | 2,734
Charge-offs | (30) | (50) | (126) | (119)
Recoveries | 12 | 4 | 27 | 84
Net charge-offs | (18) | (46) | (99) | (35)
Provisions charged to operations | 7 | (258) | 40 | (1)
Ending Balance | 2,722 | 2,698 | 2,722 | 2,698
Residential real estate all other [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Beginning Balance | 7,349 | 7,004 | 7,034 | 7,030
Charge-offs | (23) | (107) | (177) | (169)
Recoveries | 3 | 5 | 30 | 34
Net charge-offs | (20) | (102) | (147) | (135)
Provisions charged to operations | (722) | 121 | (280) | 128
Ending Balance | 6,607 | 7,023 | 6,607 | 7,023
Non-consumer non-real estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Beginning Balance | 8,751 | 8,558 | 9,385 | 9,156
Charge-offs | (34) | (119) | (139) | (449)
Recoveries | 110 | 19 | 159 | 144
Net charge-offs | 76 | (100) | 20 | (305)
Provisions charged to operations | 36 | 712 | (542) | 319
Ending Balance | 8,863 | 9,170 | 8,863 | 9,170
Consumer non-real estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Beginning Balance | 2,389 | 2,282 | 2,451 | 2,315
Charge-offs | (163) | (117) | (458) | (308)
Recoveries | 65 | 42 | 202 | 157
Net charge-offs | (98) | (75) | (256) | (151)
Provisions charged to operations | 207 | 162 | 303 | 205
Ending Balance | 2,498 | 2,369 | 2,498 | 2,369
Other loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Beginning Balance | 1,961 | 1,854 | 1,885 | 1,886
Charge-offs | (76) | (24) | (235) | (231)
Recoveries | 24 | 2 | 55 | 33
Net charge-offs | (52) | (22) | (180) | (198)
Provisions charged to operations | 36 | 6 | 240 | 150
Ending Balance | 1,945 | 1,838 | 1,945 | 1,838
Acquired loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Beginning Balance | 219 | 387 | 220 | 587
Charge-offs | (3) | (53) | (53) | (129)
Recoveries | 3 |  | 39 | 11
Net charge-offs |  | (53) | (14) | (118)
Provisions charged to operations | (124) | (57) | (111) | (192)
Ending Balance | $ 95 | $ 277 | $ 95 | $ 277

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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 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 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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