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FAIR VALUE - Fair Value Hierarchy Measurement (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Assets: |  |
Trading securities - U.S. Treasury securities | $ 50,357 | $ 0
Securities available-for-sale, at fair value | 3,490,478 | 3,065,251
Single family LHFS | 21,397 |
Single family mortgage servicing rights | 59,536 |
U.S. Treasury securities |  |
Assets: |  |
Securities available-for-sale, at fair value | 20,579 |
Obligations of states and political subdivisions |  |
Assets: |  |
Securities available-for-sale, at fair value | 467,870 | 91,299
Mortgage backed securities - residential |  |
Assets: |  |
Securities available-for-sale, at fair value | 2,374,155 | 2,643,688
Mortgage backed securities - commercial |  |
Assets: |  |
Securities available-for-sale, at fair value | 378,178 | 240,862
Collateralized loan obligations |  |
Assets: |  |
Securities available-for-sale, at fair value | 188,689 | 50,000
Corporate bonds |  |
Assets: |  |
Securities available-for-sale, at fair value | 53,484 | 39,402
Agency debentures |  |
Assets: |  |
Securities available-for-sale, at fair value | 7,523 |
Recurring |  |
Assets: |  |
Securities available-for-sale, at fair value | 3,490,478 | 3,065,251
Single family LHFS | 21,397 | 0
Equity securities | 16,018 | 15,355
Total assets | 3,649,541 | 3,093,441
Liabilities: |  |
Total liabilities | 10,372 | 11,063
Recurring | Residential Mortgage |  |
Assets: |  |
Single family mortgage servicing rights | 59,536 |
Recurring | Level 1 |  |
Assets: |  |
Securities available-for-sale, at fair value | 20,579 | 0
Single family LHFS | 0 |
Equity securities | 0 | 0
Total assets | 70,936 | 0
Liabilities: |  |
Total liabilities | 1 | 0
Recurring | Level 1 | Residential Mortgage |  |
Assets: |  |
Single family mortgage servicing rights | 0 |
Recurring | Level 2 |  |
Assets: |  |
Securities available-for-sale, at fair value | 3,468,240 | 3,065,251
Single family LHFS | 21,397 |
Equity securities | 16,018 | 15,355
Total assets | 3,517,133 | 3,093,441
Liabilities: |  |
Total liabilities | 10,371 | 11,056
Recurring | Level 2 | Residential Mortgage |  |
Assets: |  |
Single family mortgage servicing rights | 0 |
Recurring | Level 3 |  |
Assets: |  |
Securities available-for-sale, at fair value | 1,659 | 0
Single family LHFS | 0 |
Equity securities | 0 | 0
Total assets | 61,472 | 0
Liabilities: |  |
Total liabilities | 0 | 7
Recurring | Level 3 | Residential Mortgage |  |
Assets: |  |
Single family mortgage servicing rights | 59,536 |
Recurring | U.S. Treasury securities |  |
Assets: |  |
Trading securities - U.S. Treasury securities | 50,357 |
Securities available-for-sale, at fair value | 20,579 |
Recurring | U.S. Treasury securities | Level 1 |  |
Assets: |  |
Trading securities - U.S. Treasury securities | 50,357 |
Securities available-for-sale, at fair value | 20,579 |
Recurring | U.S. Treasury securities | Level 2 |  |
Assets: |  |
Trading securities - U.S. Treasury securities | 0 |
Securities available-for-sale, at fair value | 0 |
Recurring | U.S. Treasury securities | Level 3 |  |
Assets: |  |
Trading securities - U.S. Treasury securities | 0 |
Securities available-for-sale, at fair value | 0 |
Recurring | Obligations of states and political subdivisions |  |
Assets: |  |
Securities available-for-sale, at fair value | 467,870 | 91,299
Recurring | Obligations of states and political subdivisions | Level 1 |  |
Assets: |  |
Securities available-for-sale, at fair value | 0 | 0
Recurring | Obligations of states and political subdivisions | Level 2 |  |
Assets: |  |
Securities available-for-sale, at fair value | 467,870 | 91,299
Recurring | Obligations of states and political subdivisions | Level 3 |  |
Assets: |  |
Securities available-for-sale, at fair value | 0 | 0
Recurring | Mortgage backed securities - residential |  |
Assets: |  |
Securities available-for-sale, at fair value | 2,374,155 | 2,643,688
Recurring | Mortgage backed securities - residential | Level 1 |  |
Assets: |  |
Securities available-for-sale, at fair value | 0 | 0
Recurring | Mortgage backed securities - residential | Level 2 |  |
Assets: |  |
Securities available-for-sale, at fair value | 2,372,543 | 2,643,688
Recurring | Mortgage backed securities - residential | Level 3 |  |
Assets: |  |
Securities available-for-sale, at fair value | 1,612 | 0
Recurring | Mortgage backed securities - commercial |  |
Assets: |  |
Securities available-for-sale, at fair value | 378,178 | 240,862
Recurring | Mortgage backed securities - commercial | Level 1 |  |
Assets: |  |
Securities available-for-sale, at fair value | 0 | 0
Recurring | Mortgage backed securities - commercial | Level 2 |  |
Assets: |  |
Securities available-for-sale, at fair value | 378,178 | 240,862
Recurring | Mortgage backed securities - commercial | Level 3 |  |
Assets: |  |
Securities available-for-sale, at fair value | 0 | 0
Recurring | Collateralized loan obligations |  |
Assets: |  |
Securities available-for-sale, at fair value | 188,689 | 50,000
Recurring | Collateralized loan obligations | Level 1 |  |
Assets: |  |
Securities available-for-sale, at fair value | 0 | 0
Recurring | Collateralized loan obligations | Level 2 |  |
Assets: |  |
Securities available-for-sale, at fair value | 188,689 | 50,000
Recurring | Collateralized loan obligations | Level 3 |  |
Assets: |  |
Securities available-for-sale, at fair value | 0 | 0
Recurring | Corporate bonds |  |
Assets: |  |
Securities available-for-sale, at fair value | 53,484 | 39,402
Recurring | Corporate bonds | Level 1 |  |
Assets: |  |
Securities available-for-sale, at fair value | 0 | 0
Recurring | Corporate bonds | Level 2 |  |
Assets: |  |
Securities available-for-sale, at fair value | 53,437 | 39,402
Recurring | Corporate bonds | Level 3 |  |
Assets: |  |
Securities available-for-sale, at fair value | 47 | 0
Recurring | Agency debentures |  |
Assets: |  |
Securities available-for-sale, at fair value | 7,523 |
Recurring | Agency debentures | Level 1 |  |
Assets: |  |
Securities available-for-sale, at fair value | 0 |
Recurring | Agency debentures | Level 2 |  |
Assets: |  |
Securities available-for-sale, at fair value | 7,523 |
Recurring | Agency debentures | Level 3 |  |
Assets: |  |
Securities available-for-sale, at fair value | 0 |
Recurring | Forward Loan Sale Commitments |  |
Assets: |  |
Derivative assets | 131 |
Liabilities: |  |
Derivative liabilities | 112 |
Recurring | Forward Loan Sale Commitments | Level 1 |  |
Assets: |  |
Derivative assets | 0 |
Liabilities: |  |
Derivative liabilities | 0 |
Recurring | Forward Loan Sale Commitments | Level 2 |  |
Assets: |  |
Derivative assets | 131 |
Liabilities: |  |
Derivative liabilities | 112 |
Recurring | Forward Loan Sale Commitments | Level 3 |  |
Assets: |  |
Derivative assets | 0 |
Liabilities: |  |
Derivative liabilities | 0 |
Recurring | Interest rate lock commitments |  |
Assets: |  |
Derivative assets | 277 |
Liabilities: |  |
Derivative liabilities |  | 7
Recurring | Interest rate lock commitments | Level 1 |  |
Assets: |  |
Derivative assets | 0 |
Liabilities: |  |
Derivative liabilities |  | 0
Recurring | Interest rate lock commitments | Level 2 |  |
Assets: |  |
Derivative assets | 0 |
Liabilities: |  |
Derivative liabilities |  | 0
Recurring | Interest rate lock commitments | Level 3 |  |
Assets: |  |
Derivative assets | 277 |
Liabilities: |  |
Derivative liabilities |  | 7
Recurring | Interest rate swaps |  |
Assets: |  |
Derivative assets | 11,347 | 12,835
Liabilities: |  |
Derivative liabilities | 10,259 | 11,056
Recurring | Interest rate swaps | Level 1 |  |
Assets: |  |
Derivative assets | 0 | 0
Liabilities: |  |
Derivative liabilities | 0 | 0
Recurring | Interest rate swaps | Level 2 |  |
Assets: |  |
Derivative assets | 11,347 | 12,835
Liabilities: |  |
Derivative liabilities | 10,259 | 11,056
Recurring | Interest rate swaps | Level 3 |  |
Assets: |  |
Derivative assets | 0 |
Liabilities: |  |
Derivative liabilities | 0 | $ 0
Recurring | Futures |  |
Liabilities: |  |
Derivative liabilities | 1 |
Recurring | Futures | Level 1 |  |
Liabilities: |  |
Derivative liabilities | 1 |
Recurring | Futures | Level 2 |  |
Liabilities: |  |
Derivative liabilities | 0 |
Recurring | Futures | Level 3 |  |
Liabilities: |  |
Derivative liabilities | $ 0 |

X
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Name: | us-gaap_FinancialInstrumentAxis=us-gaap_FutureMember
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Data Type: | na
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