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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Purchased Credit Impaired Loans Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Net gain on sale of loans |  |  | $ 1,932 | $ 11,942 | $ 35,895
Total unpaid principal balance of sold PCI loan pools | $ 165,700 |  |  |  |
Total fair value of sold PCI loan pools | 144,200 |  |  |  |
Gain on sale of PCI loan pools | $ 4,700 |  |  |  |
Single family residential mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Aggregate unpaid principal |  | $ 168,300 |  |  |
Aggregate carrying value |  | 147,900 |  |  |
PCI Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Fair value adjustments |  | (274) |  |  |
Total unpaid principal balance of sold PCI loan pools |  | 147,500 |  |  |
Total fair value of sold PCI loan pools |  | 128,400 |  |  |
PCI Loans | Consumer | Single family residential mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Aggregate unpaid principal |  |  |  |  | 766,000
Aggregate carrying value |  |  |  |  | 707,400
Net gain on sale of loans |  | $ (1,800) |  |  | $ 24,700

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- Definition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Unpaid Principal Balance, Sold + References No definition available. + Details
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- Definition Transfer Of Portfolio Loans And Leases To Held-For-Sale, Aggregate Carrying Value + References No definition available. + Details
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