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INVESTMENT SECURITIES - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 134,484	$ 24,170
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(5,225)	(1,212)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	134,484	24,170
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(5,225)	(1,212)
Allowance for credit losses on securities	0
Agency mortgage-backed securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	19,668	10,279
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,482)	(831)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	19,668	10,279
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(1,482)	(831)
Agency collateralized mortgage obligations
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	105,043	12,727
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(3,594)	(375)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	105,043	12,727
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(3,594)	(375)
States and political subdivisions securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	9,773	1,164
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(149)	(6)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	9,773	1,164
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (149)	$ (6)

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
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- Definition

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+ References

No definition available.

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- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

+ References

No definition available.

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- Definition

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+ References

No definition available.

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- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455

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-Publisher FASB
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