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FAIR VALUE MEASUREMENT - Schedule of Fair Value Hierarchy Measurement (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets:
Investment securities AFS	$ 1,270,654	$ 1,378,774
Single family mortgage servicing rights	76,470
Derivatives	612	893
Liabilities:
Derivative liabilities	15,430	13,179
Residential mortgage-backed securities
Assets:
Investment securities AFS	182,969	197,262
Commercial mortgage-backed securities
Assets:
Investment securities AFS	47,563	56,049
Municipal bonds
Assets:
Investment securities AFS	378,298	411,548
Corporate debt securities
Assets:
Investment securities AFS	38,968	42,945
U.S. Treasury securities
Assets:
Investment securities AFS	19,445	19,934
Agency debentures
Assets:
Investment securities AFS	65,103	27,478
Recurring
Assets:
Single family LHFS	23,945	14,075
Single family LHFI	1,225	5,868
Single family mortgage servicing rights	76,470	76,617
Total assets	1,409,405	1,508,094
Liabilities:
Total liabilities	15,185	13,280
Recurring | Residential mortgage-backed securities
Assets:
Investment securities AFS	182,969	197,262
Recurring | Commercial mortgage-backed securities
Assets:
Investment securities AFS	47,563	56,049
Recurring | Collateralized mortgage obligations residential
Assets:
Investment securities AFS	479,556	553,039
Recurring | Collateralized mortgage obligations commercial
Assets:
Investment securities AFS	58,752	70,519
Recurring | Municipal bonds
Assets:
Investment securities AFS	378,298	411,548
Recurring | Corporate debt securities
Assets:
Investment securities AFS	38,968	42,945
Recurring | U.S. Treasury securities
Assets:
Trading securities - U.S. Treasury securities	21,591	18,997
Investment securities AFS	19,445	19,934
Recurring | Agency debentures
Assets:
Investment securities AFS	65,103	27,478
Recurring | Futures
Assets:
Derivatives		18
Liabilities:
Derivative liabilities	2
Recurring | Forward sale commitments
Assets:
Derivatives	479	293
Liabilities:
Derivative liabilities	74	151
Recurring | Options
Assets:
Derivatives	7	218
Recurring | Interest rate lock commitments
Assets:
Derivatives	118	141
Liabilities:
Derivative liabilities	193	36
Recurring | Interest rate swaps
Assets:
Derivatives	14,916	13,093
Liabilities:
Derivative liabilities	14,916	13,093
Level 1 | Recurring
Assets:
Single family LHFS	0	0
Single family LHFI	0	0
Single family mortgage servicing rights	0	0
Total assets	21,598	19,233
Liabilities:
Total liabilities	2	0
Level 1 | Recurring | Residential mortgage-backed securities
Assets:
Investment securities AFS	0	0
Level 1 | Recurring | Commercial mortgage-backed securities
Assets:
Investment securities AFS	0	0
Level 1 | Recurring | Collateralized mortgage obligations residential
Assets:
Investment securities AFS	0	0
Level 1 | Recurring | Collateralized mortgage obligations commercial
Assets:
Investment securities AFS	0	0
Level 1 | Recurring | Municipal bonds
Assets:
Investment securities AFS	0	0
Level 1 | Recurring | Corporate debt securities
Assets:
Investment securities AFS	0	0
Level 1 | Recurring | U.S. Treasury securities
Assets:
Trading securities - U.S. Treasury securities	21,591	18,997
Investment securities AFS	0	0
Level 1 | Recurring | Agency debentures
Assets:
Investment securities AFS	0	0
Level 1 | Recurring | Futures
Assets:
Derivatives		18
Liabilities:
Derivative liabilities	2
Level 1 | Recurring | Forward sale commitments
Assets:
Derivatives	0	0
Liabilities:
Derivative liabilities	0	0
Level 1 | Recurring | Options
Assets:
Derivatives	7	218
Level 1 | Recurring | Interest rate lock commitments
Assets:
Derivatives	0	0
Liabilities:
Derivative liabilities	0	0
Level 1 | Recurring | Interest rate swaps
Assets:
Derivatives	0	0
Liabilities:
Derivative liabilities	0	0
Level 2 | Recurring
Assets:
Single family LHFS	23,945	14,075
Single family LHFI	0	0
Single family mortgage servicing rights	0	0
Total assets	1,308,199	1,404,226
Liabilities:
Total liabilities	14,990	13,244
Level 2 | Recurring | Residential mortgage-backed securities
Assets:
Investment securities AFS	181,174	195,321
Level 2 | Recurring | Commercial mortgage-backed securities
Assets:
Investment securities AFS	47,563	56,049
Level 2 | Recurring | Collateralized mortgage obligations residential
Assets:
Investment securities AFS	479,556	553,039
Level 2 | Recurring | Collateralized mortgage obligations commercial
Assets:
Investment securities AFS	58,752	70,519
Level 2 | Recurring | Municipal bonds
Assets:
Investment securities AFS	378,298	411,548
Level 2 | Recurring | Corporate debt securities
Assets:
Investment securities AFS	38,968	42,877
Level 2 | Recurring | U.S. Treasury securities
Assets:
Trading securities - U.S. Treasury securities	0	0
Investment securities AFS	19,445	19,934
Level 2 | Recurring | Agency debentures
Assets:
Investment securities AFS	65,103	27,478
Level 2 | Recurring | Futures
Assets:
Derivatives		0
Liabilities:
Derivative liabilities	0
Level 2 | Recurring | Forward sale commitments
Assets:
Derivatives	479	293
Liabilities:
Derivative liabilities	74	151
Level 2 | Recurring | Options
Assets:
Derivatives	0	0
Level 2 | Recurring | Interest rate lock commitments
Assets:
Derivatives	0	0
Liabilities:
Derivative liabilities	0	0
Level 2 | Recurring | Interest rate swaps
Assets:
Derivatives	14,916	13,093
Liabilities:
Derivative liabilities	14,916	13,093
Level 3 | Recurring
Assets:
Single family LHFS	0	0
Single family LHFI	1,225	5,868
Single family mortgage servicing rights	76,470	76,617
Total assets	79,608	84,635
Liabilities:
Total liabilities	193	36
Level 3 | Recurring | Residential mortgage-backed securities
Assets:
Investment securities AFS	1,795	1,941
Level 3 | Recurring | Commercial mortgage-backed securities
Assets:
Investment securities AFS	0	0
Level 3 | Recurring | Collateralized mortgage obligations residential
Assets:
Investment securities AFS	0	0
Level 3 | Recurring | Collateralized mortgage obligations commercial
Assets:
Investment securities AFS	0	0
Level 3 | Recurring | Municipal bonds
Assets:
Investment securities AFS	0	0
Level 3 | Recurring | Corporate debt securities
Assets:
Investment securities AFS	0	68
Level 3 | Recurring | U.S. Treasury securities
Assets:
Trading securities - U.S. Treasury securities	0	0
Investment securities AFS	0	0
Level 3 | Recurring | Agency debentures
Assets:
Investment securities AFS	0	0
Level 3 | Recurring | Futures
Assets:
Derivatives		0
Liabilities:
Derivative liabilities	0
Level 3 | Recurring | Forward sale commitments
Assets:
Derivatives	0	0
Liabilities:
Derivative liabilities	0	0
Level 3 | Recurring | Options
Assets:
Derivatives	0	0
Level 3 | Recurring | Interest rate lock commitments
Assets:
Derivatives	118	141
Liabilities:
Derivative liabilities	193	36
Level 3 | Recurring | Interest rate swaps
Assets:
Derivatives	0	0
Liabilities:
Derivative liabilities	$ 0	$ 0

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount excluding accrued interest, 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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