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LOANS AND LEASES - Summary of Payment Status of TDRs (Detail) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Troubled debt restructurings ("TDRs") | $ 54 | $ 48
Originated Loans and Leases [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Troubled debt restructurings ("TDRs") | 51 | 44
Acquired Loans [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Troubled debt restructurings ("TDRs") | 3 | 4
Performing [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Troubled debt restructurings ("TDRs") | 19 | 18
Performing [Member] | Originated Loans and Leases [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Troubled debt restructurings ("TDRs") | 19 | 18
Performing [Member] | Acquired Loans [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Troubled debt restructurings ("TDRs") | 0 | 0
Non-Performing [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Troubled debt restructurings ("TDRs") | 19 | 21
Non-Performing [Member] | Originated Loans and Leases [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Troubled debt restructurings ("TDRs") | 16 | 17
Non-Performing [Member] | Acquired Loans [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Troubled debt restructurings ("TDRs") | 3 | 4
Non-Accrual [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Troubled debt restructurings ("TDRs") | 16 | 9
Non-Accrual [Member] | Originated Loans and Leases [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Troubled debt restructurings ("TDRs") | 16 | 9
Non-Accrual [Member] | Acquired Loans [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Troubled debt restructurings ("TDRs") | $ 0 | $ 0

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- Definition Amount of financing receivable modified as troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18845-111554 + Details
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