SECURITIES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
OTTI, Sales and Calls, Pledged, Trading and Restricted Securities
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	$ 0	$ 46,478	$ 230,372
Gross gains realized on sale of securities available for sale			200	(7,900)
Debt and Equity Securities, Gain (Loss)			201	(7,921)
Proceeds from calls of securities	10,000	$ 0	20,300	$ 1,900
Fair value of securities pledged to secure public deposits and FHLB and FRB overnight borrowings	292,700		292,700		$ 354,300
Amount owned in FHLB, ACBB and FRB stock	$ 28,469		$ 28,469		$ 24,028

Represents description of credit support for student loan backed bonds.

No definition available.

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- Definition

Represents description of guaranteed portion of student loan backed bonds.

+ References

No definition available.

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- Definition

Amount of unrealized and realized gain (loss) on investment in debt and equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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-Paragraph 2
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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), excluding other-than-temporary impairment (OTTI).

+ References

No definition available.

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 25
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- Definition

Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

+ References

No definition available.

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- Definition

Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions.

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-SubTopic 30
-Section 50
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