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INVESTMENT SECURITIES (Narrative) (Details) $ in Thousands	3 Months Ended			6 Months Ended
INVESTMENT SECURITIES (Narrative) (Details) $ in Thousands	Jun. 30, 2019 USD ($) security shares	Mar. 31, 2019 USD ($) shares	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) security shares	Jun. 30, 2018 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($) security
Class of Stock [Line Items]
Debt Securities, Held-to-maturity	$ 0			$ 0			$ 148,508
Fair value	0			0			144,272
Proceeds from sale of MasterCard stock				2,555	$ 0
Available-for-sale securities, sold at par	0		$ 0	0	$ 0
Investment securities pledged as collateral	$ 753,300			$ 753,300			$ 980,200
Number of investment securities in an unrealized loss position \| security	134			134			336
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