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Loans and Allowance for Loan Losses - Activity in All by Class of Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Balance at beginning of period | $ 41,666 | $ 40,889
Charge- offs | (1,280) | (762)
Recoveries | 82 | 96
Net charge- offs | (1,198) | (666)
Provisions charged to operations | 4,103 | 1,334
Balance at end of period | 44,571 | 41,557
Non-residential Real Estate Owner Occupied [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Balance at beginning of period | 4,661 | 4,406
Charge- offs | (1) | (1)
Recoveries |  | 1
Net charge- offs | (1) |
Provisions charged to operations | 172 | 55
Balance at end of period | 4,832 | 4,461
Non-residential Real Estate Other [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Balance at beginning of period | 9,921 | 9,616
Charge- offs | (1) |
Recoveries | 1 |
Provisions charged to operations | 290 | 282
Balance at end of period | 10,211 | 9,898
Residential Real Estate Permanent Mortgage [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Balance at beginning of period | 3,148 | 2,948
Charge- offs | (50) | (40)
Recoveries | 17 | 9
Net charge- offs | (33) | (31)
Provisions charged to operations | 49 | 67
Balance at end of period | 3,164 | 2,984
Residential Real Estate All Other [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Balance at beginning of period | 6,725 | 6,269
Charge- offs | (67) | (68)
Recoveries | 4 | 5
Net charge- offs | (63) | (63)
Provisions charged to operations | 1,327 | 372
Balance at end of period | 7,989 | 6,578
Non-consumer Non-real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Balance at beginning of period | 11,754 | 12,771
Charge- offs | (803) | (153)
Recoveries | 11 | 31
Net charge- offs | (792) | (122)
Provisions charged to operations | 1,851 | 419
Balance at end of period | 12,813 | 13,068
Consumer Non-real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Balance at beginning of period | 2,642 | 2,404
Charge- offs | (221) | (127)
Recoveries | 38 | 15
Net charge- offs | (183) | (112)
Provisions charged to operations | 94 | 35
Balance at end of period | 2,553 | 2,327
Other Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Balance at beginning of period | 2,648 | 2,359
Charge- offs | (133) | (213)
Recoveries | 6 | 9
Net charge- offs | (127) | (204)
Provisions charged to operations | 269 | 86
Balance at end of period | 2,790 | 2,241
Acquired Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Balance at beginning of period | 167 | 116
Charge- offs | (4) | (160)
Recoveries | 5 | 26
Net charge- offs | 1 | (134)
Provisions charged to operations | 51 | $ 18
Balance at end of period | $ 219 |

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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 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=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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