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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 |  |  |  |  |  |
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Mar. 31, 2019 | Jun. 30, 2018 | Sep. 30, 2019 | Jun. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  | $ 61,500 |  | $ 60,200 |  |  |
Operating Lease, Liability |  |  | 67,025 |  | $ 65,800 |  |  |
Debt Securities, Held-to-maturity, Transfer, Amount | $ 268,700 | $ 367,900 |  |  |  |  |  |
Realized gain (loss) on debt securities transferred from HTM to AFS | $ 200 |  |  |  |  |  |  |
Loans and Leases Receivable, Allowance |  | $ 54,076 | $ 56,552 | $ 61,549 |  | $ 56,542 | $ 57,715 | $ 54,021
Allowance for loans and leases losses, range of increase, minimum |  |  | 1.12% |  |  |  |  |
Allowance for loans and leases losses, increase, maximum |  |  | 1.32% |  |  |  |  |

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- Definition Allowance for loans and leases losses maximum percent increase expected under CECL. + References No definition available. + Details
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- Definition Allowance for loans and leases losses minimum percent increase 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 Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 Reference 4: 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 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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