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INVESTMENT SECURITIES (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) security shares	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) security
Class of Stock [Line Items]
Proceeds from sale of available-for-sale securities	$ 0.0	$ 0.0
Investment securities pledged as collateral	$ 494.1		$ 483.6
Number of investment securities in an unrealized loss position | security	95		37
Common Class B | Visa
Class of Stock [Line Items]
Shares owned (in shares) | shares	34,631

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Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

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