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Loans and Allowance for Loan Losses - Activity in ALL by Class of Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | $ 51,666 |  |  |  | $ 48,693 | $ 51,666 | $ 48,693 |
Charge- offs |  |  |  |  |  |  |  |  | (5,003) | (6,965) |
Recoveries |  |  |  |  |  |  |  |  | 924 | 1,426 |
Net charge- offs |  |  |  |  |  |  |  |  | (4,079) | (5,539) |
Provisions charged to operations | $ 1,516 | $ 747 | $ 1,225 | 314 | $ 3,323 | $ 3,276 | $ 1,841 | 72 | 3,802 | 8,512 | $ 11,519
Balance at end of period | 51,389 |  |  |  | 51,666 |  |  |  | 51,389 | 51,666 | 48,693
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 6,195 |  |  |  | 5,602 | 6,195 | 5,602 |
Charge- offs |  |  |  |  |  |  |  |  | (282) | (74) |
Recoveries |  |  |  |  |  |  |  |  | 17 | 6 |
Net charge- offs |  |  |  |  |  |  |  |  | (265) | (68) |
Provisions charged to operations |  |  |  |  |  |  |  |  | 398 | 661 |
Balance at end of period | 6,328 |  |  |  | 6,195 |  |  |  | 6,328 | 6,195 | 5,602
Real Estate [Member] | Non-residential Real Estate Other [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 10,519 |  |  |  | 10,793 | 10,519 | 10,793 |
Charge- offs |  |  |  |  |  |  |  |  | (93) | (47) |
Recoveries |  |  |  |  |  |  |  |  | 41 | 16 |
Net charge- offs |  |  |  |  |  |  |  |  | (52) | (31) |
Provisions charged to operations |  |  |  |  |  |  |  |  | 560 | (243) |
Balance at end of period | 11,027 |  |  |  | 10,519 |  |  |  | 11,027 | 10,519 | 10,793
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 3,226 |  |  |  | 3,129 | 3,226 | 3,129 |
Charge- offs |  |  |  |  |  |  |  |  | (174) | (373) |
Recoveries |  |  |  |  |  |  |  |  | 26 | 25 |
Net charge- offs |  |  |  |  |  |  |  |  | (148) | (348) |
Provisions charged to operations |  |  |  |  |  |  |  |  | 183 | 445 |
Balance at end of period | 3,261 |  |  |  | 3,226 |  |  |  | 3,261 | 3,226 | 3,129
Real Estate [Member] | Residential Real Estate All Other [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 9,672 |  |  |  | 8,622 | 9,672 | 8,622 |
Charge- offs |  |  |  |  |  |  |  |  | (395) | (330) |
Recoveries |  |  |  |  |  |  |  |  | 106 | 66 |
Net charge- offs |  |  |  |  |  |  |  |  | (289) | (264) |
Provisions charged to operations |  |  |  |  |  |  |  |  | 1,290 | 1,314 |
Balance at end of period | 10,673 |  |  |  | 9,672 |  |  |  | 10,673 | 9,672 | 8,622
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 15,334 |  |  |  | 12,421 | 15,334 | 12,421 |
Charge- offs |  |  |  |  |  |  |  |  | (2,257) | (1,344) |
Recoveries |  |  |  |  |  |  |  |  | 92 | 1,033 |
Net charge- offs |  |  |  |  |  |  |  |  | (2,165) | (311) |
Provisions charged to operations |  |  |  |  |  |  |  |  | (18) | 3,224 |
Balance at end of period | 13,151 |  |  |  | 15,334 |  |  |  | 13,151 | 15,334 | 12,421
Consumer Non-real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 2,793 |  |  |  | 2,804 | 2,793 | 2,804 |
Charge- offs |  |  |  |  |  |  |  |  | (1,066) | (913) |
Recoveries |  |  |  |  |  |  |  |  | 245 | 180 |
Net charge- offs |  |  |  |  |  |  |  |  | (821) | (733) |
Provisions charged to operations |  |  |  |  |  |  |  |  | 1,093 | 722 |
Balance at end of period | 3,065 |  |  |  | 2,793 |  |  |  | 3,065 | 2,793 | 2,804
Other Loans [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 2,481 |  |  |  | 4,045 | 2,481 | 4,045 |
Charge- offs |  |  |  |  |  |  |  |  | (16) | (3,727) |
Recoveries |  |  |  |  |  |  |  |  | 361 | 23 |
Net charge- offs |  |  |  |  |  |  |  |  | 345 | (3,704) |
Provisions charged to operations |  |  |  |  |  |  |  |  | (403) | 2,140 |
Balance at end of period | 2,423 |  |  |  | 2,481 |  |  |  | 2,423 | 2,481 | 4,045
Acquired Loans [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | $ 1,446 |  |  |  | $ 1,277 | 1,446 | 1,277 |
Charge- offs |  |  |  |  |  |  |  |  | (720) | (157) |
Recoveries |  |  |  |  |  |  |  |  | 36 | 77 |
Net charge- offs |  |  |  |  |  |  |  |  | (684) | (80) |
Provisions charged to operations |  |  |  |  |  |  |  |  | 699 | 249 |
Balance at end of period | $ 1,461 |  |  |  | $ 1,446 |  |  |  | $ 1,461 | $ 1,446 | $ 1,277

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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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