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FAIR VALUE MEASUREMENT - Schedule of Fair Value Hierarchy Measurement (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Assets:
Investment securities AFS	$ 1,412,537	$ 1,378,774
Single family mortgage servicing rights	75,701
Derivatives	1,067	893
Liabilities:
Derivative liabilities	11,306	13,179
Residential mortgage-backed securities
Assets:
Investment securities AFS	200,658	197,262
Commercial mortgage-backed securities
Assets:
Investment securities AFS	54,230	56,049
Municipal bonds
Assets:
Investment securities AFS	413,658	411,548
Corporate debt securities
Assets:
Investment securities AFS	41,302	42,945
U.S. Treasury securities
Assets:
Investment securities AFS	20,319	19,934
Agency debentures
Assets:
Investment securities AFS	58,359	27,478
Recurring
Assets:
Single family LHFS	22,690	14,075
Single family LHFI	5,231	5,868
Single family mortgage servicing rights	75,701	76,617
Total assets	1,590,071	1,508,094
Liabilities:
Total liabilities	11,067	13,280
Recurring | Residential mortgage-backed securities
Assets:
Investment securities AFS	200,658	197,262
Recurring | Commercial mortgage-backed securities
Assets:
Investment securities AFS	54,230	56,049
Recurring | Collateralized mortgage obligations residential
Assets:
Investment securities AFS	553,234	553,039
Recurring | Collateralized mortgage obligations commercial
Assets:
Investment securities AFS	70,777	70,519
Recurring | Municipal bonds
Assets:
Investment securities AFS	413,658	411,548
Recurring | Corporate debt securities
Assets:
Investment securities AFS	41,302	42,945
Recurring | U.S. Treasury securities
Assets:
Trading securities - U.S. Treasury securities	62,044	18,997
Investment securities AFS	20,319	19,934
Recurring | Agency debentures
Assets:
Investment securities AFS	58,359	27,478
Recurring | Futures
Assets:
Derivatives	34	18
Recurring | Forward sale commitments
Assets:
Derivatives	229	293
Liabilities:
Derivative liabilities	326	151
Recurring | Options
Assets:
Derivatives	503	218
Recurring | Interest rate lock commitments
Assets:
Derivatives	398	141
Liabilities:
Derivative liabilities	36	36
Recurring | Interest rate swaps
Assets:
Derivatives	10,704	13,093
Liabilities:
Derivative liabilities	10,705	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	62,581	19,233
Liabilities:
Total liabilities	0	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	62,044	18,997
Investment securities AFS	0	0
Level 1 | Recurring | Agency debentures
Assets:
Investment securities AFS	0	0
Level 1 | Recurring | Futures
Assets:
Derivatives	34	18
Level 1 | Recurring | Forward sale commitments
Assets:
Derivatives	0	0
Liabilities:
Derivative liabilities	0	0
Level 1 | Recurring | Options
Assets:
Derivatives	503	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	22,690	14,075
Single family LHFI	0	0
Single family mortgage servicing rights	0	0
Total assets	1,444,130	1,404,226
Liabilities:
Total liabilities	11,031	13,244
Level 2 | Recurring | Residential mortgage-backed securities
Assets:
Investment securities AFS	198,694	195,321
Level 2 | Recurring | Commercial mortgage-backed securities
Assets:
Investment securities AFS	54,230	56,049
Level 2 | Recurring | Collateralized mortgage obligations residential
Assets:
Investment securities AFS	553,234	553,039
Level 2 | Recurring | Collateralized mortgage obligations commercial
Assets:
Investment securities AFS	70,777	70,519
Level 2 | Recurring | Municipal bonds
Assets:
Investment securities AFS	413,658	411,548
Level 2 | Recurring | Corporate debt securities
Assets:
Investment securities AFS	41,236	42,877
Level 2 | Recurring | U.S. Treasury securities
Assets:
Trading securities - U.S. Treasury securities	0	0
Investment securities AFS	20,319	19,934
Level 2 | Recurring | Agency debentures
Assets:
Investment securities AFS	58,359	27,478
Level 2 | Recurring | Futures
Assets:
Derivatives	0	0
Level 2 | Recurring | Forward sale commitments
Assets:
Derivatives	229	293
Liabilities:
Derivative liabilities	326	151
Level 2 | Recurring | Options
Assets:
Derivatives	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	10,704	13,093
Liabilities:
Derivative liabilities	10,705	13,093
Level 3 | Recurring
Assets:
Single family LHFS	0	0
Single family LHFI	5,231	5,868
Single family mortgage servicing rights	75,701	76,617
Total assets	83,360	84,635
Liabilities:
Total liabilities	36	36
Level 3 | Recurring | Residential mortgage-backed securities
Assets:
Investment securities AFS	1,964	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	66	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	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	398	141
Liabilities:
Derivative liabilities	36	36
Level 3 | Recurring | Interest rate swaps
Assets:
Derivatives	0	0
Liabilities:
Derivative liabilities	$ 0	$ 0

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