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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | $ 51,550 | $ 47,921 | $ 51,666 | $ 48,693
Charge- offs | (672) | (879) | (1,271) | (2,760)
Recoveries | 97 | 122 | 266 | 1,159
Net charge- offs | (575) | (757) | (1,005) | (1,601)
Provisions charged to operations | 1,225 | 1,841 | 1,539 | 1,913
Balance at end of period | 52,200 | 49,005 | 52,200 | 49,005
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 6,650 | 5,562 | 6,195 | 5,602
Charge- offs |  | (40) | (19) | (72)
Recoveries |  | 3 | 1 | 4
Net charge- offs |  | (37) | (18) | (68)
Provisions charged to operations | (224) | 160 | 249 | 151
Balance at end of period | 6,426 | 5,685 | 6,426 | 5,685
Real Estate [Member] | Non-residential Real Estate Other [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 10,548 | 10,788 | 10,519 | 10,793
Charge- offs |  | (25) | (1) | (26)
Recoveries |  | 1 | 39 | 2
Net charge- offs |  | (24) | 38 | (24)
Provisions charged to operations | 157 | (284) | 148 | (289)
Balance at end of period | 10,705 | 10,480 | 10,705 | 10,480
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 3,281 | 3,130 | 3,226 | 3,129
Charge- offs | (6) | (36) | (62) | (156)
Recoveries | 23 | 10 | 26 | 11
Net charge- offs | 17 | (26) | (36) | (145)
Provisions charged to operations | 9 | 44 | 117 | 164
Balance at end of period | 3,307 | 3,148 | 3,307 | 3,148
Real Estate [Member] | Residential Real Estate All Other [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 9,831 | 8,659 | 9,672 | 8,622
Charge- offs | (151) | (16) | (241) | (73)
Recoveries | 3 | 6 | 6 | 17
Net charge- offs | (148) | (10) | (235) | (56)
Provisions charged to operations | 440 | 263 | 686 | 346
Balance at end of period | 10,123 | 8,912 | 10,123 | 8,912
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 14,785 | 12,810 | 15,334 | 12,421
Charge- offs | (153) | (471) | (309) | (677)
Recoveries | 10 | 61 | 23 | 979
Net charge- offs | (143) | (410) | (286) | 302
Provisions charged to operations | 427 | 1,243 | 21 | 920
Balance at end of period | 15,069 | 13,643 | 15,069 | 13,643
Consumer Non-real Estate [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 2,699 | 2,725 | 2,793 | 2,804
Charge- offs | (194) | (234) | (444) | (468)
Recoveries | 44 | 32 | 124 | 83
Net charge- offs | (150) | (202) | (320) | (385)
Provisions charged to operations | 290 | 183 | 366 | 287
Balance at end of period | 2,839 | 2,706 | 2,839 | 2,706
Other Loans [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 2,336 | 2,958 | 2,481 | 4,045
Charge- offs | (2) | (56) | (2) | (1,274)
Recoveries | 12 | 1 | 24 | 5
Net charge- offs | 10 | (55) | 22 | (1,269)
Provisions charged to operations | (18) | 103 | (175) | 230
Balance at end of period | 2,328 | 3,006 | 2,328 | 3,006
Acquired Loans [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 1,420 | 1,289 | 1,446 | 1,277
Charge- offs | (166) | (1) | (193) | (14)
Recoveries | 5 | 8 | 23 | 58
Net charge- offs | (161) | 7 | (170) | 44
Provisions charged to operations | 144 | 129 | 127 | 104
Balance at end of period | $ 1,403 | $ 1,425 | $ 1,403 | $ 1,425

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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://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=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://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=84173941&loc=SL6953423-111524 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 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=84173941&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=84173941&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 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: 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=82894903&loc=d3e15032-111544 + Details
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