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FAIR VALUE MEASUREMENT - Schedule of Fair Value Hierarchy Measurement (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Fair value of debt securities available for sale | $ 978,843 | $ 1,072,093
Single family mortgage servicing rights | 61,206 |
Derivative assets | 10,455 | 27,639
Liabilities: |  |
Derivative liabilities | 1,641 | 2,785
Residential mortgage-backed securities |  |
Assets: |  |
Fair value of debt securities available for sale | 33,467 | 51,046
Commercial mortgage-backed securities |  |
Assets: |  |
Fair value of debt securities available for sale | 42,050 | 45,184
Municipal bonds |  |
Assets: |  |
Fair value of debt securities available for sale | 534,401 | 564,703
Corporate debt securities |  |
Assets: |  |
Fair value of debt securities available for sale | 19,849 | 15,222
Agency debentures |  |
Assets: |  |
Fair value of debt securities available for sale |  | 1,846
Recurring |  |
Assets: |  |
Fair value of loans held for sale | 135,942 | 194,643
Fair value of loans held for investment | 4,507 | 7,108
Single family mortgage servicing rights | 61,206 | 49,966
Total assets | 1,195,301 | 1,359,699
Liabilities: |  |
Total liabilities | 11,550 | 24,232
Recurring | Residential mortgage-backed securities |  |
Assets: |  |
Fair value of debt securities available for sale | 33,467 | 51,046
Recurring | Commercial mortgage-backed securities |  |
Assets: |  |
Fair value of debt securities available for sale | 42,050 | 45,184
Recurring | Collateralized mortgage obligations residential |  |
Assets: |  |
Fair value of debt securities available for sale | 184,360 | 234,909
Recurring | Collateralized mortgage obligations commercial |  |
Assets: |  |
Fair value of debt securities available for sale | 141,324 | 159,183
Recurring | Municipal bonds |  |
Assets: |  |
Fair value of debt securities available for sale | 534,401 | 564,703
Recurring | Corporate debt securities |  |
Assets: |  |
Fair value of debt securities available for sale | 19,849 | 15,222
Recurring | U.S. Treasury securities |  |
Assets: |  |
Fair value of debt securities available for sale | 23,392 |
Recurring | Agency debentures |  |
Assets: |  |
Fair value of debt securities available for sale |  | 1,846
Recurring | Eurodollar futures |  |
Liabilities: |  |
Derivative liabilities | 9 | 4
Recurring | Forward sale commitments |  |
Assets: |  |
Derivative assets | 1,419 | 1,035
Liabilities: |  |
Derivative liabilities | 1,017 | 3,714
Recurring | Interest rate lock commitments |  |
Assets: |  |
Derivative assets | 4,612 | 17,395
Liabilities: |  |
Derivative liabilities | 3 | 3
Recurring | Interest rate swaps |  |
Assets: |  |
Derivative assets | 8,772 | 17,459
Liabilities: |  |
Derivative liabilities | 10,521 | 20,511
Level 1 | Recurring |  |
Assets: |  |
Fair value of loans held for sale | 0 | 0
Fair value of loans held for investment | 0 | 0
Single family mortgage servicing rights | 0 | 0
Total assets | 0 | 0
Liabilities: |  |
Total liabilities | 9 | 4
Level 1 | Recurring | Residential mortgage-backed securities |  |
Assets: |  |
Fair value of debt securities available for sale | 0 | 0
Level 1 | Recurring | Commercial mortgage-backed securities |  |
Assets: |  |
Fair value of debt securities available for sale | 0 | 0
Level 1 | Recurring | Collateralized mortgage obligations residential |  |
Assets: |  |
Fair value of debt securities available for sale | 0 | 0
Level 1 | Recurring | Collateralized mortgage obligations commercial |  |
Assets: |  |
Fair value of debt securities available for sale | 0 | 0
Level 1 | Recurring | Municipal bonds |  |
Assets: |  |
Fair value of debt securities available for sale | 0 | 0
Level 1 | Recurring | Corporate debt securities |  |
Assets: |  |
Fair value of debt securities available for sale | 0 | 0
Level 1 | Recurring | U.S. Treasury securities |  |
Assets: |  |
Fair value of debt securities available for sale | 0 |
Level 1 | Recurring | Agency debentures |  |
Assets: |  |
Fair value of debt securities available for sale |  | 0
Level 1 | Recurring | Eurodollar futures |  |
Liabilities: |  |
Derivative liabilities | 9 | 4
Level 1 | Recurring | Forward sale commitments |  |
Assets: |  |
Derivative assets | 0 | 0
Liabilities: |  |
Derivative liabilities | 0 | 0
Level 1 | Recurring | Interest rate lock commitments |  |
Assets: |  |
Derivative assets | 0 | 0
Liabilities: |  |
Derivative liabilities | 0 | 0
Level 1 | Recurring | Interest rate swaps |  |
Assets: |  |
Derivative assets | 0 | 0
Liabilities: |  |
Derivative liabilities | 0 | 0
Level 2 | Recurring |  |
Assets: |  |
Fair value of loans held for sale | 135,942 | 194,643
Fair value of loans held for investment | 0 | 0
Single family mortgage servicing rights | 0 | 0
Total assets | 1,122,462 | 1,282,520
Liabilities: |  |
Total liabilities | 11,538 | 24,225
Level 2 | Recurring | Residential mortgage-backed securities |  |
Assets: |  |
Fair value of debt securities available for sale | 31,030 | 48,417
Level 2 | Recurring | Commercial mortgage-backed securities |  |
Assets: |  |
Fair value of debt securities available for sale | 42,050 | 45,184
Level 2 | Recurring | Collateralized mortgage obligations residential |  |
Assets: |  |
Fair value of debt securities available for sale | 184,360 | 234,909
Level 2 | Recurring | Collateralized mortgage obligations commercial |  |
Assets: |  |
Fair value of debt securities available for sale | 141,324 | 159,183
Level 2 | Recurring | Municipal bonds |  |
Assets: |  |
Fair value of debt securities available for sale | 534,401 | 564,703
Level 2 | Recurring | Corporate debt securities |  |
Assets: |  |
Fair value of debt securities available for sale | 19,772 | 15,141
Level 2 | Recurring | U.S. Treasury securities |  |
Assets: |  |
Fair value of debt securities available for sale | 23,392 |
Level 2 | Recurring | Agency debentures |  |
Assets: |  |
Fair value of debt securities available for sale |  | 1,846
Level 2 | Recurring | Eurodollar futures |  |
Liabilities: |  |
Derivative liabilities | 0 | 0
Level 2 | Recurring | Forward sale commitments |  |
Assets: |  |
Derivative assets | 1,419 | 1,035
Liabilities: |  |
Derivative liabilities | 1,017 | 3,714
Level 2 | Recurring | Interest rate lock commitments |  |
Assets: |  |
Derivative assets | 0 | 0
Liabilities: |  |
Derivative liabilities | 0 | 0
Level 2 | Recurring | Interest rate swaps |  |
Assets: |  |
Derivative assets | 8,772 | 17,459
Liabilities: |  |
Derivative liabilities | 10,521 | 20,511
Level 3 | Recurring |  |
Assets: |  |
Fair value of loans held for sale | 0 | 0
Fair value of loans held for investment | 4,507 | 7,108
Single family mortgage servicing rights | 61,206 | 49,966
Total assets | 72,839 | 77,179
Liabilities: |  |
Total liabilities | 3 | 3
Level 3 | Recurring | Residential mortgage-backed securities |  |
Assets: |  |
Fair value of debt securities available for sale | 2,437 | 2,629
Level 3 | Recurring | Commercial mortgage-backed securities |  |
Assets: |  |
Fair value of debt securities available for sale | 0 | 0
Level 3 | Recurring | Collateralized mortgage obligations residential |  |
Assets: |  |
Fair value of debt securities available for sale | 0 | 0
Level 3 | Recurring | Collateralized mortgage obligations commercial |  |
Assets: |  |
Fair value of debt securities available for sale | 0 | 0
Level 3 | Recurring | Municipal bonds |  |
Assets: |  |
Fair value of debt securities available for sale | 0 | 0
Level 3 | Recurring | Corporate debt securities |  |
Assets: |  |
Fair value of debt securities available for sale | 77 | 81
Level 3 | Recurring | U.S. Treasury securities |  |
Assets: |  |
Fair value of debt securities available for sale | 0 |
Level 3 | Recurring | Agency debentures |  |
Assets: |  |
Fair value of debt securities available for sale |  | 0
Level 3 | Recurring | Eurodollar futures |  |
Liabilities: |  |
Derivative liabilities | 0 | 0
Level 3 | Recurring | Forward sale commitments |  |
Assets: |  |
Derivative assets | 0 | 0
Liabilities: |  |
Derivative liabilities | 0 | 0
Level 3 | Recurring | Interest rate lock commitments |  |
Assets: |  |
Derivative assets | 4,612 | 17,395
Liabilities: |  |
Derivative liabilities | 3 | 3
Level 3 | Recurring | Interest rate swaps |  |
Assets: |  |
Derivative assets | 0 | 0
Liabilities: |  |
Derivative liabilities |  | $ 0

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