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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2019
Accounting Policies [Abstract]
Reserve requirement		$ 65,200
Investment securities classified as held-to-maturity		$ 0
Held-to maturity securities transferred	$ 740,900
Unrealized gain arising from the reclassification of securities held-to-maturity to securities available-for-sale	$ 22,000

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Amount of pass-through reserves deposited with Federal Reserve Banks from member institutions of Federal Home Loan Banks (FHLBanks).

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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).

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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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Amount before tax and reclassification adjustments of unrealized holding gain (loss) related to transfers of securities into the available-for-sale classification and out of the held-to-maturity classification.

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