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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