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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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