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SECURITIES - Amortized cost and Fair values of held-to-maturity securities transferred from available-for-sale securities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Held-to-maturity
Debt securities held-to-maturity	$ 309,132		$ 68,395
Fair Value	314,924		72,441
U.S. government agency
Held-to-maturity
Debt securities held-to-maturity	7,332
Fair Value	7,485
Mortgage-backed: Agency residential
Held-to-maturity
Debt securities held-to-maturity	24,063		13,031
Fair Value	24,567		13,483
Mortgage-backed: Agency commercial
Held-to-maturity
Debt securities held-to-maturity	258,563		32,880
Fair Value	262,582		$ 35,084
Debt Securities Transferred
Held-to-maturity
Debt securities held-to-maturity	99,271	$ 135,161
Fair Value	99,275	129,720
Debt Securities Transferred | U.S. government agency
Held-to-maturity
Debt securities held-to-maturity		7,593
Fair Value		7,323
Debt Securities Transferred | Mortgage-backed: Agency residential
Held-to-maturity
Debt securities held-to-maturity		8,776
Fair Value		8,536
Debt Securities Transferred | Mortgage-backed: Agency commercial
Held-to-maturity
Debt securities held-to-maturity	99,271	118,792
Fair Value	$ 99,275	$ 113,861

X

- Definition

Amount of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
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-Publisher FASB
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-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 5A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269820-111563

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