v3.26.1
FAIR VALUE MEASUREMENTS - Fair Value Hierarchy Measurement (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Assets:    
Trading securities - U.S. Treasury securities $ 46,595 $ 49,518
Securities available-for-sale, at fair value 4,119,215 3,993,385
Single family LHFS 5,345 5,967
Single family mortgage servicing rights 58,836 58,095
Obligations of states and political subdivisions    
Assets:    
Securities available-for-sale, at fair value 462,720 471,159
Mortgage backed securities - residential    
Assets:    
Securities available-for-sale, at fair value 3,001,195 2,884,289
Mortgage backed securities - commercial    
Assets:    
Securities available-for-sale, at fair value 352,604 371,806
Collateralized loan obligations    
Assets:    
Securities available-for-sale, at fair value 230,582 188,316
Corporate bonds    
Assets:    
Securities available-for-sale, at fair value 45,383 49,915
U.S. Treasury securities    
Assets:    
Securities available-for-sale, at fair value 20,424 20,669
Agency debentures    
Assets:    
Securities available-for-sale, at fair value 6,307 7,231
Recurring    
Assets:    
Securities available-for-sale, at fair value 4,119,215 3,993,385
Single family LHFS 5,345 5,967
Equity securities 15,858 15,567
Total assets 4,254,851 4,132,161
Liabilities:    
Total liabilities 8,445 8,573
Recurring | Residential Mortgage    
Assets:    
Single family mortgage servicing rights 58,836 58,095
Recurring | Level 1    
Assets:    
Securities available-for-sale, at fair value 20,424 20,669
Single family LHFS 0 0
Equity securities 0 0
Total assets 67,019 70,187
Liabilities:    
Total liabilities 1 2
Recurring | Level 1 | Residential Mortgage    
Assets:    
Single family mortgage servicing rights 0 0
Recurring | Level 2    
Assets:    
Securities available-for-sale, at fair value 4,097,236 3,971,086
Single family LHFS 5,345 5,967
Equity securities 15,858 15,567
Total assets 4,127,373 4,002,174
Liabilities:    
Total liabilities 8,444 8,571
Recurring | Level 2 | Residential Mortgage    
Assets:    
Single family mortgage servicing rights 0 0
Recurring | Level 3    
Assets:    
Securities available-for-sale, at fair value 1,555 1,630
Single family LHFS 0 0
Equity securities 0 0
Total assets 60,459 59,800
Liabilities:    
Total liabilities 0 0
Recurring | Level 3 | Residential Mortgage    
Assets:    
Single family mortgage servicing rights 58,836 58,095
Recurring | Obligations of states and political subdivisions    
Assets:    
Securities available-for-sale, at fair value 462,720 471,159
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 462,720 471,159
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 3,001,195 2,884,289
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 2,999,681 2,882,704
Recurring | Mortgage backed securities - residential | Level 3    
Assets:    
Securities available-for-sale, at fair value 1,514 1,585
Recurring | Mortgage backed securities - commercial    
Assets:    
Securities available-for-sale, at fair value 352,604 371,806
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 352,604 371,806
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 230,582 188,316
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 230,582 188,316
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 45,383 49,915
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 45,342 49,870
Recurring | Corporate bonds | Level 3    
Assets:    
Securities available-for-sale, at fair value 41 45
Recurring | U.S. Treasury securities    
Assets:    
Trading securities - U.S. Treasury securities 46,595 49,518
Securities available-for-sale, at fair value 20,424 20,669
Recurring | U.S. Treasury securities | Level 1    
Assets:    
Trading securities - U.S. Treasury securities 46,595 49,518
Securities available-for-sale, at fair value 20,424 20,669
Recurring | U.S. Treasury securities | Level 2    
Assets:    
Trading securities - U.S. Treasury securities 0 0
Securities available-for-sale, at fair value 0 0
Recurring | U.S. Treasury securities | Level 3    
Assets:    
Trading securities - U.S. Treasury securities 0 0
Securities available-for-sale, at fair value 0 0
Recurring | Agency debentures    
Assets:    
Securities available-for-sale, at fair value 6,307 7,231
Recurring | Agency debentures | Level 1    
Assets:    
Securities available-for-sale, at fair value 0 0
Recurring | Agency debentures | Level 2    
Assets:    
Securities available-for-sale, at fair value 6,307 7,231
Recurring | Agency debentures | Level 3    
Assets:    
Securities available-for-sale, at fair value 0 0
Recurring | Forward loan sale commitments    
Assets:    
Derivative assets 105 148
Liabilities:    
Derivative liabilities 90 28
Recurring | Forward loan sale commitments | Level 1    
Assets:    
Derivative assets 0 0
Liabilities:    
Derivative liabilities 0 0
Recurring | Forward loan sale commitments | Level 2    
Assets:    
Derivative assets 105 148
Liabilities:    
Derivative liabilities 90 28
Recurring | Forward loan sale commitments | Level 3    
Assets:    
Derivative assets 0 0
Liabilities:    
Derivative liabilities 0 0
Recurring | Interest rate lock commitments    
Assets:    
Derivative assets 68 75
Recurring | Interest rate lock commitments | Level 1    
Assets:    
Derivative assets 0 0
Recurring | Interest rate lock commitments | Level 2    
Assets:    
Derivative assets 0 0
Recurring | Interest rate lock commitments | Level 3    
Assets:    
Derivative assets 68 75
Recurring | Interest rate swaps    
Assets:    
Derivative assets 8,829 9,406
Liabilities:    
Derivative liabilities 8,354 8,543
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 8,829 9,406
Liabilities:    
Derivative liabilities 8,354 8,543
Recurring | Interest rate swaps | Level 3    
Assets:    
Derivative assets 0 0
Liabilities:    
Derivative liabilities 0 0
Recurring | Futures    
Liabilities:    
Derivative liabilities 1 2
Recurring | Futures | Level 1    
Liabilities:    
Derivative liabilities 1 2
Recurring | Futures | Level 2    
Liabilities:    
Derivative liabilities 0 0
Recurring | Futures | Level 3    
Liabilities:    
Derivative liabilities $ 0 $ 0