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Off-Balance Sheet Commitments - Distribution of Undisbursed Loan Commitments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Loss Contingencies [Line Items] |  |  |  |  |
Total undisbursed loan commitments | $ 394,973 |  | $ 394,973 |  | $ 347,236
Allowance for Loan Off-Balance Sheet Items [Roll Forward] |  |  |  |  |
Balance at beginning of period |  |  | 31,043 |  |
Loan and lease loss provision | 100 | $ 422 | 749 | $ 342 |
Balance at end of period | 31,818 |  | 31,818 |  |
Non-PCI Loans and Leases [Member] |  |  |  |  |
Allowance for Loan Off-Balance Sheet Items [Roll Forward] |  |  |  |  |
Balance at beginning of period | 31,777 | 33,152 | 31,043 | 32,429 |
Loan and lease loss provision | 100 | 422 | 749 | 342 |
Balance at end of period | 31,818 | 33,758 | 31,818 | 33,758 |
Allowance for off-balance sheet items [Member] | Non-PCI Loans and Leases [Member] |  |  |  |  |
Allowance for Loan Off-Balance Sheet Items [Roll Forward] |  |  |  |  |
Balance at beginning of period | 1,323 | 1,184 | 1,296 | 1,184 |
Loan and lease loss provision | 34 | (49) | 61 | (49) |
Balance at end of period | 1,357 | $ 1,135 | 1,357 | $ 1,135 |
Commitments to extend credit [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Total undisbursed loan commitments | 354,894 |  | 354,894 |  | 318,634
Standby letters of credit [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Total undisbursed loan commitments | 24,702 |  | 24,702 |  | 19,294
Commercial letters of credit [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Total undisbursed loan commitments | $ 15,377 |  | $ 15,377 |  | $ 9,308

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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=84173941&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=82894903&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=84173941&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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