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INVESTMENT SECURITIES (Narrative) (Details)	3 Months Ended			6 Months Ended
	Jun. 30, 2020 USD ($) security shares	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($) shares	Jun. 30, 2020 USD ($) security shares	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) security	Jan. 01, 2019 USD ($)
Class of Stock [Line Items]
Proceeds from sale of MasterCard stock				$ 0	$ 2,555,000
Available-for-sale securities, sold at par	$ 0	$ 0		0	$ 0
Investment securities pledged as collateral	$ 597,400,000			$ 597,400,000		$ 719,800,000
Number of investment securities in an unrealized loss position | security	25			25		81
Visa [Member] | Common Class B [Member]
Class of Stock [Line Items]
Shares owned (in shares) | shares	34,631			34,631
Credit Card Intermediary [Member] | Common Class B [Member]
Class of Stock [Line Items]
Shares owned (in shares) | shares			11,170
Proceeds from sale of MasterCard stock			$ 2,600,000
Accounting Standards Update 2017-12 [Member]
Class of Stock [Line Items]
Debt Securities, Held-to-maturity							$ 148,500,000
Fair value							$ 144,300,000

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