SECURITIES - Narrative (Details) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020 USD ($) item	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) item	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
OTTI, Sales and Calls, Pledged, Trading and Restricted Securities
Non-accrual debt securities	$ 0		$ 0
Accrued interest related to debt securities	$ 0		$ 0
Number of securities in unrealized loss position \| item	0		0
Debt securities available for sale, allowance of credit losses	$ 0		$ 0
Allowance for credit losses	0		$ 0
Guaranteed portion of student loan backed bonds			student loan backed bonds which are guaranteed by the U.S. Department of Education for 97% to 100% of principal.
Credit support for student loan backed bonds description			the bonds have credit support of 3% to 5%
Proceeds from sales of securities available for sale	0	$ 46,500	$ 74,558	$ 46,478
Gross gains realized on sale of securities available for sale	800	200	800	200
Gross losses realized on sale of securities available for sale	800		800
Debt and Equity Securities, Gain (Loss)		201	(15)	201
Proceeds from calls of securities	6,900	$ 2,400	12,200	$ 10,300
Fair value of securities pledged to secure public deposits and FHLB and FRB overnight borrowings	576,200		576,200		$ 402,200
Amount owned in FHLB, ACBB and FRB stock	28,987		28,987		$ 32,879
Other Assets
OTTI, Sales and Calls, Pledged, Trading and Restricted Securities
Accrued interest receivable on securities	$ 1,900		$ 1,900

Represents description of credit support for student loan backed bonds.

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Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments.

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Cash received from maturities, prepayments and calls of trading securities and other securities, classified as operating.

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