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INVESTMENT SECURITIES (Narrative) (Details) $ in Thousands	3 Months Ended
INVESTMENT SECURITIES (Narrative) (Details) $ in Thousands	Mar. 31, 2020 USD ($) security shares	Mar. 31, 2019 USD ($) shares	Dec. 31, 2019 USD ($) security	Jan. 01, 2019 USD ($)
Class of Stock [Line Items]
Proceeds from sale of MasterCard stock	$ 0	$ 2,555
Available-for-sale securities, sold at par		$ 0
Investment securities pledged as collateral	$ 617,900		$ 719,800
Number of investment securities in an unrealized loss position \| security	50		81
Visa [Member] \| Common Class B [Member]
Class of Stock [Line Items]
Shares owned (in shares) \| shares	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