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FAIR VALUE MEASUREMENT - Schedule of Fair Value Hierarchy Measurement (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Assets:
Investment securities AFS	$ 1,117,551	$ 1,251,199
Derivatives	1,185	1,064
Liabilities:
Derivative liabilities	7,945	10,588
Residential mortgage-backed securities
Assets:
Investment securities AFS	173,904	183,798
Commercial mortgage-backed securities
Assets:
Investment securities AFS	49,178	47,756
Municipal bonds
Assets:
Investment securities AFS	395,964	404,874
Corporate debt securities
Assets:
Investment securities AFS	34,960	38,547
U.S. Treasury securities
Assets:
Investment securities AFS	20,505	20,184
Agency debentures
Assets:
Investment securities AFS	46,043	58,905
Recurring
Assets:
Single family LHFS	38,863	12,849
Single family LHFI	1,329	1,280
Single family mortgage servicing rights	70,800	74,249
Total assets	1,275,473	1,375,458
Liabilities:
Total liabilities	8,338	10,783
Recurring | Residential mortgage-backed securities
Assets:
Investment securities AFS	173,904	183,798
Recurring | Commercial mortgage-backed securities
Assets:
Investment securities AFS	49,178	47,756
Recurring | Collateralized mortgage obligations residential
Assets:
Investment securities AFS	340,359	439,738
Recurring | Collateralized mortgage obligations commercial
Assets:
Investment securities AFS	56,638	57,397
Recurring | Municipal bonds
Assets:
Investment securities AFS	395,964	404,874
Recurring | Corporate debt securities
Assets:
Investment securities AFS	34,960	38,547
Recurring | U.S. Treasury securities
Assets:
Trading securities - U.S. Treasury securities	38,166	24,698
Investment securities AFS	20,505	20,184
Recurring | Agency debentures
Assets:
Investment securities AFS	46,043	58,905
Recurring | Futures
Liabilities:
Derivative liabilities	13	3
Recurring | Forward sale commitments
Assets:
Derivatives	175	151
Liabilities:
Derivative liabilities	338	288
Recurring | Options
Assets:
Derivatives	9	132
Recurring | Interest rate lock commitments
Assets:
Derivatives	655	411
Liabilities:
Derivative liabilities	59
Recurring | Interest rate swaps
Assets:
Derivatives	7,925	10,489
Liabilities:
Derivative liabilities	7,928	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	38,175	24,830
Liabilities:
Total liabilities	13	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	38,166	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	13	3
Level 1 | Recurring | Forward sale commitments
Assets:
Derivatives	0	0
Liabilities:
Derivative liabilities	0	0
Level 1 | Recurring | Options
Assets:
Derivatives	9	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	38,863	12,849
Single family LHFI	0	0
Single family mortgage servicing rights	0	0
Total assets	1,162,710	1,272,828
Liabilities:
Total liabilities	8,266	10,780
Level 2 | Recurring | Residential mortgage-backed securities
Assets:
Investment securities AFS	172,100	181,938
Level 2 | Recurring | Commercial mortgage-backed securities
Assets:
Investment securities AFS	49,178	47,756
Level 2 | Recurring | Collateralized mortgage obligations residential
Assets:
Investment securities AFS	340,359	439,738
Level 2 | Recurring | Collateralized mortgage obligations commercial
Assets:
Investment securities AFS	56,638	57,397
Level 2 | Recurring | Municipal bonds
Assets:
Investment securities AFS	395,964	404,874
Level 2 | Recurring | Corporate debt securities
Assets:
Investment securities AFS	34,960	38,547
Level 2 | Recurring | U.S. Treasury securities
Assets:
Trading securities - U.S. Treasury securities	0	0
Investment securities AFS	20,505	20,184
Level 2 | Recurring | Agency debentures
Assets:
Investment securities AFS	46,043	58,905
Level 2 | Recurring | Futures
Liabilities:
Derivative liabilities	0	0
Level 2 | Recurring | Forward sale commitments
Assets:
Derivatives	175	151
Liabilities:
Derivative liabilities	338	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	7,925	10,489
Liabilities:
Derivative liabilities	7,928	10,492
Level 3 | Recurring
Assets:
Single family LHFS	0	0
Single family LHFI	1,329	1,280
Single family mortgage servicing rights	70,800	74,249
Total assets	74,588	77,800
Liabilities:
Total liabilities	59	0
Level 3 | Recurring | Residential mortgage-backed securities
Assets:
Investment securities AFS	1,804	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	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	655	411
Liabilities:
Derivative liabilities	59
Level 3 | Recurring | Interest rate swaps
Assets:
Derivatives	0	0
Liabilities:
Derivative liabilities	$ 0	$ 0

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