SECURITIES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 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
Proceeds from calls of securities	7,900	$ 0
Fair value of securities pledged to secure public deposits and FHLB and FRB overnight borrowings	402,900		$ 354,300
Amount owned in FHLB, ACBB and FRB stock	$ 28,068		$ 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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- 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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585

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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 50
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