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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Loans and Lease Acquired through Acquisition (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Outstanding unpaid principal balance at acquisition | $ 0 | $ 0 | $ 103,799
Cash flows expected to be collected at acquisitions | 0 | 0 | 114,552
Fair value of acquired loans at acquisition | 0 | 0 | 90,984
Consumer | Single family residential mortgage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Outstanding unpaid principal balance at acquisition | $ 0 | $ 0 | $ 103,799

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