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FAIR VALUE MEASUREMENT - Schedule of Fair Value Hierarchy Measurement (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets:
Investment securities AFS	$ 1,161,008	$ 1,251,199
Derivatives	540	1,064
Liabilities:
Derivative liabilities	12,137	10,588
Residential mortgage-backed securities
Assets:
Investment securities AFS	178,591	183,798
Commercial mortgage-backed securities
Assets:
Investment securities AFS	47,470	47,756
Municipal bonds
Assets:
Investment securities AFS	398,100	404,874
Corporate debt securities
Assets:
Investment securities AFS	35,152	38,547
U.S. Treasury securities
Assets:
Investment securities AFS	19,896	20,184
Agency debentures
Assets:
Investment securities AFS	53,437	58,905
Recurring
Assets:
Single family LHFS	19,023	12,849
Single family LHFI	1,285	1,280
Single family mortgage servicing rights	74,056	74,249
Total assets	1,295,584	1,375,458
Liabilities:
Total liabilities	12,163	10,783
Recurring | Residential mortgage-backed securities
Assets:
Investment securities AFS	178,591	183,798
Recurring | Commercial mortgage-backed securities
Assets:
Investment securities AFS	47,470	47,756
Recurring | Collateralized mortgage obligations residential
Assets:
Investment securities AFS	371,660	439,738
Recurring | Collateralized mortgage obligations commercial
Assets:
Investment securities AFS	56,702	57,397
Recurring | Municipal bonds
Assets:
Investment securities AFS	398,100	404,874
Recurring | Corporate debt securities
Assets:
Investment securities AFS	35,152	38,547
Recurring | U.S. Treasury securities
Assets:
Trading securities - U.S. Treasury securities	27,746	24,698
Investment securities AFS	19,896	20,184
Recurring | Agency debentures
Assets:
Investment securities AFS	53,437	58,905
Recurring | Futures
Liabilities:
Derivative liabilities		3
Recurring | Forward sale commitments
Assets:
Derivatives	196	151
Liabilities:
Derivative liabilities	234	288
Recurring | Options
Assets:
Derivatives	6	132
Recurring | Interest rate lock commitments
Assets:
Derivatives	385	411
Liabilities:
Derivative liabilities	49
Recurring | Interest rate swaps
Assets:
Derivatives	11,879	10,489
Liabilities:
Derivative liabilities	11,880	10,492
Level 1 | Recurring
Assets:
Single family LHFS	0	0
Single family LHFI	0	0
Single family mortgage servicing rights	0	0
Total assets	27,752	24,830
Liabilities:
Total liabilities	0	3
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	27,746	24,698
Investment securities AFS	0	0
Level 1 | Recurring | Agency debentures
Assets:
Investment securities AFS	0	0
Level 1 | Recurring | Futures
Liabilities:
Derivative liabilities		3
Level 1 | Recurring | Forward sale commitments
Assets:
Derivatives	0	0
Liabilities:
Derivative liabilities	0	0
Level 1 | Recurring | Options
Assets:
Derivatives	6	132
Level 1 | Recurring | Interest rate lock commitments
Assets:
Derivatives	0	0
Liabilities:
Derivative liabilities	0
Level 1 | Recurring | Interest rate swaps
Assets:
Derivatives	0	0
Liabilities:
Derivative liabilities	0	0
Level 2 | Recurring
Assets:
Single family LHFS	19,023	12,849
Single family LHFI	0	0
Single family mortgage servicing rights	0	0
Total assets	1,190,315	1,272,828
Liabilities:
Total liabilities	12,114	10,780
Level 2 | Recurring | Residential mortgage-backed securities
Assets:
Investment securities AFS	176,800	181,938
Level 2 | Recurring | Commercial mortgage-backed securities
Assets:
Investment securities AFS	47,470	47,756
Level 2 | Recurring | Collateralized mortgage obligations residential
Assets:
Investment securities AFS	371,660	439,738
Level 2 | Recurring | Collateralized mortgage obligations commercial
Assets:
Investment securities AFS	56,702	57,397
Level 2 | Recurring | Municipal bonds
Assets:
Investment securities AFS	398,100	404,874
Level 2 | Recurring | Corporate debt securities
Assets:
Investment securities AFS	35,152	38,547
Level 2 | Recurring | U.S. Treasury securities
Assets:
Trading securities - U.S. Treasury securities	0	0
Investment securities AFS	19,896	20,184
Level 2 | Recurring | Agency debentures
Assets:
Investment securities AFS	53,437	58,905
Level 2 | Recurring | Futures
Liabilities:
Derivative liabilities		0
Level 2 | Recurring | Forward sale commitments
Assets:
Derivatives	196	151
Liabilities:
Derivative liabilities	234	288
Level 2 | Recurring | Options
Assets:
Derivatives	0	0
Level 2 | Recurring | Interest rate lock commitments
Assets:
Derivatives	0	0
Liabilities:
Derivative liabilities	0
Level 2 | Recurring | Interest rate swaps
Assets:
Derivatives	11,879	10,489
Liabilities:
Derivative liabilities	11,880	10,492
Level 3 | Recurring
Assets:
Single family LHFS	0	0
Single family LHFI	1,285	1,280
Single family mortgage servicing rights	74,056	74,249
Total assets	77,517	77,800
Liabilities:
Total liabilities	49	0
Level 3 | Recurring | Residential mortgage-backed securities
Assets:
Investment securities AFS	1,791	1,860
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	0
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
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
Level 3 | Recurring | Interest rate lock commitments
Assets:
Derivatives	385	411
Liabilities:
Derivative liabilities	49
Level 3 | Recurring | Interest rate swaps
Assets:
Derivatives	0	0
Liabilities:
Derivative liabilities	$ 0	$ 0

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