v3.26.1
FAIR VALUE DISCLOSURES OF FINANCIAL ASSETS AND LIABILITIES - Schedule of Financial Instruments Carried at Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale $ 3,841,008 $ 3,542,246
Liabilities measured at fair value on a recurring basis:    
Other liabilities 120,554 125,861
Assets measured at fair value on a recurring basis:    
Assets measured at fair value on a recurring basis:    
Other assets 129,592 145,505
Assets measured at fair value on a nonrecurring basis:    
Total assets measured at fair value 3,970,600 3,687,751
Assets measured at fair value on a nonrecurring basis:    
Assets measured at fair value on a nonrecurring basis:    
Other real estate owned 12,690 200
Total assets measured at fair value 53,088 72,863
Other investments | Assets measured at fair value on a nonrecurring basis:    
Assets measured at fair value on a nonrecurring basis:    
Other investments 6,472 11,090
Loans held for sale | Assets measured at fair value on a nonrecurring basis:    
Assets measured at fair value on a nonrecurring basis:    
Loans held for sale 33,926 61,573
Collateralized mortgage obligations (CMO)    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 381,979 405,146
Collateralized mortgage obligations (CMO) | Assets measured at fair value on a recurring basis:    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 381,979 405,146
Fannie Mae (FNMA) mortgage-backed securities (MBS)    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 3,036,590 2,785,407
Fannie Mae (FNMA) mortgage-backed securities (MBS) | Assets measured at fair value on a recurring basis:    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 3,036,590 2,785,407
Freddie Mac (FHLMC) MBS    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 148,735 116,505
Freddie Mac (FHLMC) MBS | Assets measured at fair value on a recurring basis:    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 148,735 116,505
Ginnie Mae (GNMA) MBS    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 88,416 47,383
Ginnie Mae (GNMA) MBS | Assets measured at fair value on a recurring basis:    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 88,416 47,383
Government-sponsored enterprises (GSE) agency notes    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 185,288 187,805
Government-sponsored enterprises (GSE) agency notes | Assets measured at fair value on a recurring basis:    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 185,288 187,805
Quoted Prices in Active Markets for Identical Asset (Level 1)    
Liabilities measured at fair value on a recurring basis:    
Other liabilities 0 0
Quoted Prices in Active Markets for Identical Asset (Level 1) | Assets measured at fair value on a recurring basis:    
Assets measured at fair value on a recurring basis:    
Other assets 0 0
Assets measured at fair value on a nonrecurring basis:    
Total assets measured at fair value 0 0
Quoted Prices in Active Markets for Identical Asset (Level 1) | Assets measured at fair value on a nonrecurring basis:    
Assets measured at fair value on a nonrecurring basis:    
Other real estate owned 0 0
Total assets measured at fair value 0 0
Quoted Prices in Active Markets for Identical Asset (Level 1) | Other investments | Assets measured at fair value on a nonrecurring basis:    
Assets measured at fair value on a nonrecurring basis:    
Other investments 0 0
Quoted Prices in Active Markets for Identical Asset (Level 1) | Loans held for sale | Assets measured at fair value on a nonrecurring basis:    
Assets measured at fair value on a nonrecurring basis:    
Loans held for sale 0 0
Quoted Prices in Active Markets for Identical Asset (Level 1) | Collateralized mortgage obligations (CMO) | Assets measured at fair value on a recurring basis:    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 0 0
Quoted Prices in Active Markets for Identical Asset (Level 1) | Fannie Mae (FNMA) mortgage-backed securities (MBS) | Assets measured at fair value on a recurring basis:    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 0 0
Quoted Prices in Active Markets for Identical Asset (Level 1) | Freddie Mac (FHLMC) MBS | Assets measured at fair value on a recurring basis:    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 0 0
Quoted Prices in Active Markets for Identical Asset (Level 1) | Ginnie Mae (GNMA) MBS | Assets measured at fair value on a recurring basis:    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 0 0
Quoted Prices in Active Markets for Identical Asset (Level 1) | Government-sponsored enterprises (GSE) agency notes | Assets measured at fair value on a recurring basis:    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 0 0
Significant Other Observable Inputs (Level 2)    
Liabilities measured at fair value on a recurring basis:    
Other liabilities 117,259 120,432
Significant Other Observable Inputs (Level 2) | Assets measured at fair value on a recurring basis:    
Assets measured at fair value on a recurring basis:    
Other assets 129,538 145,425
Assets measured at fair value on a nonrecurring basis:    
Total assets measured at fair value 3,970,546 3,687,671
Significant Other Observable Inputs (Level 2) | Assets measured at fair value on a nonrecurring basis:    
Assets measured at fair value on a nonrecurring basis:    
Other real estate owned 0 0
Total assets measured at fair value 33,926 61,573
Significant Other Observable Inputs (Level 2) | Other investments | Assets measured at fair value on a nonrecurring basis:    
Assets measured at fair value on a nonrecurring basis:    
Other investments 0 0
Significant Other Observable Inputs (Level 2) | Loans held for sale | Assets measured at fair value on a nonrecurring basis:    
Assets measured at fair value on a nonrecurring basis:    
Loans held for sale 33,926 61,573
Significant Other Observable Inputs (Level 2) | Collateralized mortgage obligations (CMO) | Assets measured at fair value on a recurring basis:    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 381,979 405,146
Significant Other Observable Inputs (Level 2) | Fannie Mae (FNMA) mortgage-backed securities (MBS) | Assets measured at fair value on a recurring basis:    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 3,036,590 2,785,407
Significant Other Observable Inputs (Level 2) | Freddie Mac (FHLMC) MBS | Assets measured at fair value on a recurring basis:    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 148,735 116,505
Significant Other Observable Inputs (Level 2) | Ginnie Mae (GNMA) MBS | Assets measured at fair value on a recurring basis:    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 88,416 47,383
Significant Other Observable Inputs (Level 2) | Government-sponsored enterprises (GSE) agency notes | Assets measured at fair value on a recurring basis:    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 185,288 187,805
Significant Unobservable Inputs (Level 3)    
Assets measured at fair value on a recurring basis:    
Other assets 54 80
Liabilities measured at fair value on a recurring basis:    
Other liabilities 3,295 5,429
Assets measured at fair value on a nonrecurring basis:    
Other investments 6,472 11,090
Other real estate owned 12,690 200
Significant Unobservable Inputs (Level 3) | Assets measured at fair value on a recurring basis:    
Assets measured at fair value on a recurring basis:    
Other assets 54 80
Assets measured at fair value on a nonrecurring basis:    
Total assets measured at fair value 54 80
Significant Unobservable Inputs (Level 3) | Assets measured at fair value on a nonrecurring basis:    
Assets measured at fair value on a nonrecurring basis:    
Other real estate owned 12,690 200
Total assets measured at fair value 19,162 11,290
Significant Unobservable Inputs (Level 3) | Other investments | Assets measured at fair value on a nonrecurring basis:    
Assets measured at fair value on a nonrecurring basis:    
Other investments 6,472 11,090
Significant Unobservable Inputs (Level 3) | Loans held for sale | Assets measured at fair value on a nonrecurring basis:    
Assets measured at fair value on a nonrecurring basis:    
Loans held for sale 0 0
Significant Unobservable Inputs (Level 3) | Collateralized mortgage obligations (CMO) | Assets measured at fair value on a recurring basis:    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 0 0
Significant Unobservable Inputs (Level 3) | Fannie Mae (FNMA) mortgage-backed securities (MBS) | Assets measured at fair value on a recurring basis:    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 0 0
Significant Unobservable Inputs (Level 3) | Freddie Mac (FHLMC) MBS | Assets measured at fair value on a recurring basis:    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 0 0
Significant Unobservable Inputs (Level 3) | Ginnie Mae (GNMA) MBS | Assets measured at fair value on a recurring basis:    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 0 0
Significant Unobservable Inputs (Level 3) | Government-sponsored enterprises (GSE) agency notes | Assets measured at fair value on a recurring basis:    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale $ 0 $ 0