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FAIR VALUE MEASUREMENT - Schedule of Fair Value Hierarchy Measurement (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Assets: |  |
Investment securities AFS | $ 1,201,757 | $ 1,002,522
Single family mortgage servicing rights | 76,481 |
Derivatives | 1,170 | 9,280
Liabilities: |  |
Derivative liabilities | 10,764 | 1,263
Residential mortgage-backed securities |  |
Assets: |  |
Investment securities AFS | 128,931 | 32,963
Commercial mortgage-backed securities |  |
Assets: |  |
Investment securities AFS | 63,573 | 62,792
Municipal bonds |  |
Assets: |  |
Investment securities AFS | 535,353 | 539,923
Corporate debt securities |  |
Assets: |  |
Investment securities AFS | 30,330 | 19,616
U.S. Treasury securities |  |
Assets: |  |
Investment securities AFS | 20,930 | 23,175
Recurring |  |
Assets: |  |
Single family LHFS | 35,853 | 128,041
Single family LHFI | 6,508 | 7,287
Single family mortgage servicing rights | 76,481 | 61,584
Total assets | 1,364,885 | 1,207,359
Liabilities: |  |
Total liabilities | 10,671 | 5,184
Recurring | Residential mortgage-backed securities |  |
Assets: |  |
Investment securities AFS | 128,931 | 32,963
Recurring | Commercial mortgage-backed securities |  |
Assets: |  |
Investment securities AFS | 63,573 | 62,792
Recurring | Collateralized mortgage obligations residential |  |
Assets: |  |
Investment securities AFS | 296,049 | 187,394
Recurring | Collateralized mortgage obligations commercial |  |
Assets: |  |
Investment securities AFS | 126,591 | 136,659
Recurring | Municipal bonds |  |
Assets: |  |
Investment securities AFS | 535,353 | 539,923
Recurring | Corporate debt securities |  |
Assets: |  |
Investment securities AFS | 30,330 | 19,616
Recurring | U.S. Treasury securities |  |
Assets: |  |
Trading securities - U.S. Treasury securities | 33,081 |
Investment securities AFS | 20,930 | 23,175
Recurring | Futures |  |
Assets: |  |
Derivatives |  | 334
Liabilities: |  |
Derivative liabilities | 143 |
Recurring | Forward sale commitments |  |
Assets: |  |
Derivatives | 1,058 | 723
Liabilities: |  |
Derivative liabilities | 902 | 640
Recurring | Options |  |
Assets: |  |
Derivatives | 199 |
Recurring | Interest rate lock commitments |  |
Assets: |  |
Derivatives | 737 | 2,487
Liabilities: |  |
Derivative liabilities | 415 | 3
Recurring | Interest rate swaps |  |
Assets: |  |
Derivatives | 9,211 | 4,381
Liabilities: |  |
Derivative liabilities | 9,211 | 4,541
Level 1 | Recurring |  |
Assets: |  |
Single family LHFS | 0 | 0
Single family LHFI | 0 | 0
Single family mortgage servicing rights | 0 | 0
Total assets | 33,280 | 334
Liabilities: |  |
Total liabilities | 143 | 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 | 33,081 |
Investment securities AFS | 0 | 0
Level 1 | Recurring | Futures |  |
Assets: |  |
Derivatives |  | 334
Liabilities: |  |
Derivative liabilities | 143 |
Level 1 | Recurring | Forward sale commitments |  |
Assets: |  |
Derivatives | 0 | 0
Liabilities: |  |
Derivative liabilities | 0 | 0
Level 1 | Recurring | Options |  |
Assets: |  |
Derivatives | 199 |
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 | 35,853 | 128,041
Single family LHFI | 0 | 0
Single family mortgage servicing rights | 0 | 0
Total assets | 1,245,719 | 1,133,185
Liabilities: |  |
Total liabilities | 10,113 | 5,181
Level 2 | Recurring | Residential mortgage-backed securities |  |
Assets: |  |
Investment securities AFS | 126,843 | 30,556
Level 2 | Recurring | Commercial mortgage-backed securities |  |
Assets: |  |
Investment securities AFS | 63,573 | 62,792
Level 2 | Recurring | Collateralized mortgage obligations residential |  |
Assets: |  |
Investment securities AFS | 296,049 | 187,394
Level 2 | Recurring | Collateralized mortgage obligations commercial |  |
Assets: |  |
Investment securities AFS | 126,591 | 136,659
Level 2 | Recurring | Municipal bonds |  |
Assets: |  |
Investment securities AFS | 535,353 | 539,923
Level 2 | Recurring | Corporate debt securities |  |
Assets: |  |
Investment securities AFS | 30,258 | 19,541
Level 2 | Recurring | U.S. Treasury securities |  |
Assets: |  |
Trading securities - U.S. Treasury securities | 0 |
Investment securities AFS | 20,930 | 23,175
Level 2 | Recurring | Futures |  |
Assets: |  |
Derivatives |  | 0
Liabilities: |  |
Derivative liabilities | 0 |
Level 2 | Recurring | Forward sale commitments |  |
Assets: |  |
Derivatives | 1,058 | 723
Liabilities: |  |
Derivative liabilities | 902 | 640
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 | 9,211 | 4,381
Liabilities: |  |
Derivative liabilities | 9,211 | 4,541
Level 3 | Recurring |  |
Assets: |  |
Single family LHFS | 0 | 0
Single family LHFI | 6,508 | 7,287
Single family mortgage servicing rights | 76,481 | 61,584
Total assets | 85,886 | 73,840
Liabilities: |  |
Total liabilities | 415 | 3
Level 3 | Recurring | Residential mortgage-backed securities |  |
Assets: |  |
Investment securities AFS | 2,088 | 2,407
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 | 72 | 75
Level 3 | Recurring | U.S. Treasury securities |  |
Assets: |  |
Trading securities - U.S. Treasury securities | 0 |
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 |
Level 3 | Recurring | Interest rate lock commitments |  |
Assets: |  |
Derivatives | 737 | 2,487
Liabilities: |  |
Derivative liabilities | 415 | 3
Level 3 | Recurring | Interest rate swaps |  |
Assets: |  |
Derivatives | 0 | 0
Liabilities: |  |
Derivative liabilities | $ 0 | $ 0

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