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Loans and Allowance for Loan Losses - Activity in All by Class of Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | $ 42,621 | $ 43,297 | $ 40,889 | $ 39,034
Charge- offs | (3,174) | (926) | (4,202) | (2,081)
Recoveries | 99 | 211 | 254 | 1,282
Net charge- offs | (3,075) | (715) | (3,948) | (799)
Provisions charged to operations | 1,424 | (3,115) | 4,029 | 1,232
Balance at end of period | 40,970 | 39,467 | 40,970 | 39,467
Non-residential Real Estate Owner Occupied [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 4,503 | 5,241 | 4,406 | 4,827
Charge- offs |  |  | (1) | (22)
Recoveries |  | 20 | 1 | 85
Net charge- offs |  | 20 |  | 63
Provisions charged to operations | 36 | (798) | 133 | (427)
Balance at end of period | 4,539 | 4,463 | 4,539 | 4,463
Non-residential Real Estate Other [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 9,880 | 11,238 | 9,616 | 11,026
Charge- offs | (708) | (29) | (708) | (29)
Recoveries | 1 | 45 | 2 | 48
Net charge- offs | (707) | 16 | (706) | 19
Provisions charged to operations | 814 | (1,784) | 1,077 | (1,575)
Balance at end of period | 9,987 | 9,470 | 9,987 | 9,470
Residential Real Estate Permanent Mortgage [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 3,110 | 3,310 | 2,948 | 2,825
Charge- offs | (28) | (12) | (124) | (174)
Recoveries | 15 | 18 | 29 | 59
Net charge- offs | (13) | 6 | (95) | (115)
Provisions charged to operations | (26) | (464) | 218 | 142
Balance at end of period | 3,071 | 2,852 | 3,071 | 2,852
Residential Real Estate All Other [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 6,485 | 6,815 | 6,269 | 6,708
Charge- offs | (48) | (23) | (123) | (116)
Recoveries | 4 | 9 | 13 | 23
Net charge- offs | (44) | (14) | (110) | (93)
Provisions charged to operations | 168 | (649) | 450 | (463)
Balance at end of period | 6,609 | 6,152 | 6,609 | 6,152
Non-consumer Non-real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 13,713 | 11,967 | 12,771 | 8,977
Charge- offs | (2,180) | (391) | (2,349) | (522)
Recoveries | 38 | 21 | 76 | 51
Net charge- offs | (2,142) | (370) | (2,273) | (471)
Provisions charged to operations | 86 | 412 | 1,159 | 3,503
Balance at end of period | 11,657 | 12,009 | 11,657 | 12,009
Consumer Non-real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 2,499 | 2,645 | 2,404 | 2,556
Charge- offs | (152) | (177) | (382) | (508)
Recoveries | 35 | 58 | 90 | 166
Net charge- offs | (117) | (119) | (292) | (342)
Provisions charged to operations | 160 | (132) | 430 | 180
Balance at end of period | 2,542 | 2,394 | 2,542 | 2,394
Other Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 2,431 | 1,993 | 2,359 | 1,991
Charge- offs | (20) | (93) | (283) | (344)
Recoveries | 6 | 8 | 15 | 135
Net charge- offs | (14) | (85) | (268) | (209)
Provisions charged to operations | 134 | 219 | 460 | 345
Balance at end of period | 2,551 | 2,127 | 2,551 | 2,127
Acquired Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Balance at beginning of period |  | 88 | 116 | 124
Charge- offs | (38) | (201) | (232) | (366)
Recoveries |  | 32 | 28 | 715
Net charge- offs | (38) | (169) | (204) | 349
Provisions charged to operations | 52 | $ 81 | 102 | $ (473)
Balance at end of period | $ 14 |  | $ 14 |

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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 -URI http://asc.fasb.org/extlink&oid=49124121&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 + 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=49124121&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 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 2: 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=49124121&loc=SL6953423-111524 Reference 3: 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 4: 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 5: 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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