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INVESTMENT SECURITIES (Narrative) (Details) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2020 USD ($) security shares	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($) shares	Sep. 30, 2020 USD ($) security shares	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) security	Jan. 01, 2019 USD ($)
Class of Stock [Line Items]
Proceeds from sales of investment securities available-for-sale	$ 86,500	$ 53,900		$ 86,508	$ 53,935
Investment securities gains (losses)	(352)	$ 36		(352)	$ 36
Investment securities pledged as collateral	$ 517,500			$ 517,500		$ 719,800
Number of investment securities in an unrealized loss position | security	48			48		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
Accounting Standards Update 2017-12 [Member]
Class of Stock [Line Items]
Debt Securities, Held-to-maturity							$ 148,500
Fair value							$ 144,300

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