SECURITIES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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%
Gross gains realized on sale of securities available for sale			$ 7,900
Proceeds from sales of securities available for sale		$ 46,478	230,372	$ 52,367
Gross gains realized on sale of securities available for sale				300
Gross losses realized on sale of securities available for sale				(300)
Debt and Equity Securities, Gain (Loss)	$ (7,900)	201	(7,921)	$ 38
Proceeds from calls of securities		20,300	3,300
Fair value of securities pledged to secure public deposits and FHLB and FRB overnight borrowings		402,200	354,300
Trading securities		$ 0	$ 0
Threshold for disclosure percentage		10.00%	10.00%
Amount owned in FHLB, ACBB and FRB stock		$ 32,879	$ 24,028

Represents description of credit support for student loan backed bonds.

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Represents description of guaranteed portion of student loan backed bonds.

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No definition available.

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Threshold percentage which the entity uses for disclosure.

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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

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

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

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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).

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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.

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No definition available.

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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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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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