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RECENTLY ADOPTED AND ISSUED ACCOUNTING STANDARDS RECENTLY ADOPTED AND ISSUED ACCOUNTING STANDARDS - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Jun. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
Recently Adopted and Issued Accounting Standards [Abstract] |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  | $ 58,600 | $ 0 | $ 0 | $ 60,249
Operating Lease, Liability |  |  |  |  |  | $ 65,800
Securities transferred from HTM to AFS | $ 268,700 | $ 372,100 | 268,703 | $ 372,128 | $ 0 |
Realized gain (loss) on debt securities transferred from HTM to AFS | $ 200 |  |  |  |  |
Allowance for loans and leases losses, range of increase, minimum |  |  | 115,000 |  |  |
Allowance for loans and leases losses, increase, maximum |  |  | 125,000 |  |  |
Reserve for unfunded commitments, dollar range of increase, minimum |  |  | 11,000 |  |  |
Reserve for unfunded commitments, dollar range of increase, maximum |  |  | $ 14,000 |  |  |

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- Definition Allowance for loans and leases losses, range of increase, maximum dollar amount of increase. + References No definition available. + Details
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- Definition Allowance for loans and leases losses, range of increase, minimum amount in dollars. + References No definition available. + Details
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- Definition Realized gain (loss) on debt securities transferred from HTM to AFS + References No definition available. + Details
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- Definition Recently Adopted and Issued Accounting Standards [Abstract] + References No definition available. + Details
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- Definition Reserve for unfunded commitments, dollar range of increase, maximum expected under CECL. + References No definition available. + Details
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- Definition Reserve for unfunded commitments, dollar range of increase, minimum expected under CECL. + References No definition available. + Details
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- Definition Amount of investment in debt security, measured at amortized cost, transferred to investment in debt security, measured at fair value, with change in fair value recognized in other comprehensive income (available-for-sale) and net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27405-111563 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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