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Loans and Allowance for Loan Losses - Activity in ALL by Class of Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | $ 52,915 | $ 51,550 | $ 51,389 | $ 51,666
Charge- offs | (585) | (672) | (928) | (1,271)
Recoveries | 345 | 97 | 530 | 266
Net charge- offs | (240) | (575) | (398) | (1,005)
Provisions charged to operations | 2,433 | 1,225 | 4,117 | 1,539
Balance at end of period | 55,108 | 52,200 | 55,108 | 52,200
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 6,655 | 6,650 | 6,328 | 6,195
Charge- offs | (3) |  | (9) | (19)
Recoveries |  |  | 1 | 1
Net charge- offs | (3) |  | (8) | (18)
Provisions charged to operations | 235 | (224) | 567 | 249
Balance at end of period | 6,887 | 6,426 | 6,887 | 6,426
Real Estate [Member] | Non-residential Real Estate Other [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 11,362 | 10,548 | 11,027 | 10,519
Charge- offs | (16) |  | (22) | (1)
Recoveries | 1 |  | 1 | 39
Net charge- offs | (15) |  | (21) | 38
Provisions charged to operations | (60) | 157 | 281 | 148
Balance at end of period | 11,287 | 10,705 | 11,287 | 10,705
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 3,261 | 3,281 | 3,261 | 3,226
Charge- offs | (4) | (6) | (67) | (62)
Recoveries | 4 | 23 | 9 | 26
Net charge- offs |  | 17 | (58) | (36)
Provisions charged to operations | 64 | 9 | 122 | 117
Balance at end of period | 3,325 | 3,307 | 3,325 | 3,307
Real Estate [Member] | Residential Real Estate All Other [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 11,046 | 9,831 | 10,673 | 9,672
Charge- offs | (143) | (151) | (195) | (241)
Recoveries | 25 | 3 | 27 | 6
Net charge- offs | (118) | (148) | (168) | (235)
Provisions charged to operations | 793 | 440 | 1,216 | 686
Balance at end of period | 11,721 | 10,123 | 11,721 | 10,123
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 14,409 | 14,785 | 13,151 | 15,334
Charge- offs | (87) | (153) | (157) | (309)
Recoveries | 85 | 10 | 152 | 23
Net charge- offs | (2) | (143) | (5) | (286)
Provisions charged to operations | 825 | 427 | 2,086 | 21
Balance at end of period | 15,232 | 15,069 | 15,232 | 15,069
Consumer Non-real Estate [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 3,072 | 2,699 | 3,065 | 2,793
Charge- offs | (162) | (194) | (282) | (444)
Recoveries | 38 | 44 | 109 | 124
Net charge- offs | (124) | (150) | (173) | (320)
Provisions charged to operations | 286 | 290 | 342 | 366
Balance at end of period | 3,234 | 2,839 | 3,234 | 2,839
Other Loans [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 2,408 | 2,336 | 2,423 | 2,481
Charge- offs |  | (2) |  | (2)
Recoveries | 43 | 12 | 78 | 24
Net charge- offs | 43 | 10 | 78 | 22
Provisions charged to operations | (2) | (18) | (52) | (175)
Balance at end of period | 2,449 | 2,328 | 2,449 | 2,328
Acquired Loans [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 702 | 1,420 | 1,461 | 1,446
Charge- offs | (170) | (166) | (196) | (193)
Recoveries | 149 | 5 | 153 | 23
Net charge- offs | (21) | (161) | (43) | (170)
Provisions charged to operations | 292 | 144 | (445) | 127
Balance at end of period | $ 973 | $ 1,403 | $ 973 | $ 1,403

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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=118936363&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=118936363&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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- 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://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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=118939070&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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