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SECURITIES AVAILABLE FOR SALE, HELD TO MATURITY, AND EQUITY SECURITIES - Schedule of Amortized Cost and Estimated Fair Value of Available for Sale (AFS) and Held to Maturity (HTM) Securities, Segregated by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Available for sale, Amortized Cost
Within 1 year	$ 9,800
Over 1 year to 5 years	10,863
Over 5 years to 10 years	52,127
Over 10 years	46,044
Total bonds and obligations	118,834
Mortgage-backed securities	1,502,137
Amortized  Cost	1,620,971	$ 1,661,196
Available for sale, Fair Value
Within 1 year	9,801
Over 1 year to 5 years	10,694
Over 5 years to 10 years	49,259
Over 10 years	44,563
Total bonds and obligations	114,317
Mortgage-backed securities	1,292,954
Fair Value	1,407,271	1,423,200
Held to maturity, Amortized Cost
Within 1 year	802
Over 1 year to 5 years	2,222
Over 5 years to 10 years	34,563
Over 10 years	228,352
Total bonds and obligations	265,939
Mortgage-backed securities	308,667
Amortized  Cost	574,606	583,453
Held to maturity, Fair Value
Within 1 year	803
Over 1 year to 5 years	2,218
Over 5 years to 10 years	34,659
Over 10 years	210,077
Total bonds and obligations	247,757
Mortgage-backed securities	259,334
Fair Value	$ 507,091	$ 507,464

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-URI https://asc.fasb.org/extlink&oid=126980459&loc=d3e62586-112803

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) with single maturity date and allocated without single maturity date, maturing in second through fifth rolling fiscal year following current statement of financial position date. For interim and annual periods when interim period is reported on rolling approach.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (f)(2)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126980459&loc=d3e62586-112803

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant