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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of period | $ 57,649 |  |
Provision for (reversal of) credit losses | 15,761 | $ (2,976) | $ 2,098
Balance at end of period | 78,243 | 57,649 |
Loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of period | 61,713 |  | 66,814
Loans charged off | (2,076) |  | (1,063)
Recoveries of loans previously charged off | 350 |  | 244
Net (charge-offs) recoveries | (1,726) |  | (819)
Provision for (reversal of) credit losses | 15,761 |  | 2,098
Balance at end of period | 82,131 | 61,713 | 68,093
Unfunded Loan Commitment |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of period | 4,100 |  |
Balance at end of period | 3,900 | 4,100 |
Impact of adopting ASU 2016-13 | Loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of period | 6,383 |  | 0
Balance at end of period |  | 6,383 |
Allowance for Loan Losses |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of period | 57,649 |  | 62,192
Loans charged off | (2,076) |  | (1,063)
Recoveries of loans previously charged off | 350 |  | 244
Net (charge-offs) recoveries | (1,726) |  | (819)
Provision for (reversal of) credit losses | 14,711 |  | 2,512
Balance at end of period | 78,243 | 57,649 | 63,885
Allowance for Loan Losses | Loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of period | 57,649 |  | 62,192
Loans charged off | (2,076) |  | (1,063)
Recoveries of loans previously charged off | 350 |  | 244
Net (charge-offs) recoveries | (1,726) |  | (819)
Provision for (reversal of) credit losses | 14,711 |  | 2,512
Balance at end of period | 78,243 | 57,649 | 63,885
Allowance for Loan Losses | Impact of adopting ASU 2016-13 |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of period | 7,609 |  |
Balance at end of period |  | 7,609 |
Allowance for Loan Losses | Impact of adopting ASU 2016-13 | Loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of period | 7,609 |  | 0
Balance at end of period |  | 7,609 |
Reserve for Unfunded Loan Commitments | Loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of period | 4,064 |  | 4,622
Loans charged off | 0 |  | 0
Recoveries of loans previously charged off | 0 |  | 0
Net (charge-offs) recoveries | 0 |  | 0
Provision for (reversal of) credit losses | 1,050 |  | (414)
Balance at end of period | 3,888 | 4,064 | 4,208
Reserve for Unfunded Loan Commitments | Impact of adopting ASU 2016-13 | Loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of period | $ (1,226) |  | $ 0
Balance at end of period |  | $ (1,226) |

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- Definition Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448 + Details
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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + 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)(1) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -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 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 + Details
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