v3.26.3
FAIR VALUE DISCLOSURES OF FINANCIAL ASSETS AND LIABILITIES - Schedule of Financial Instruments Carried at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale $ 3,691,117 $ 3,542,246
Liabilities measured at fair value on a recurring basis:    
Other liabilities 203,224 125,861
Assets measured at fair value on a recurring basis:    
Assets measured at fair value on a recurring basis:    
Other assets 203,877 145,505
Assets measured at fair value on a nonrecurring basis:    
Total assets measured at fair value 3,894,994 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 11,846 200
Total assets measured at fair value 39,309 72,863
Other investments | Assets measured at fair value on a nonrecurring basis:    
Assets measured at fair value on a nonrecurring basis:    
Other investments 6,077 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 21,386 61,573
Collateralized mortgage obligations (CMO)    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 381,815 405,146
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 381,815 405,146
Fannie Mae (FNMA) mortgage-backed securities (MBS)    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 2,908,667 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 2,908,667 2,785,407
Freddie Mac (FHLMC) MBS    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 141,522 116,505
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 141,522 116,505
Ginnie Mae (GNMA) MBS    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 81,131 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 81,131 47,383
Government-sponsored enterprises (GSE) agency notes    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 177,982 187,805
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 177,982 187,805
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 201,537 120,432
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 203,870 145,425
Assets measured at fair value on a nonrecurring basis:    
Total assets measured at fair value 3,894,987 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 21,386 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 21,386 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 381,815 405,146
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 2,908,667 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 141,522 116,505
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 81,131 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 177,982 187,805
Significant Unobservable Inputs (Level 3)    
Assets measured at fair value on a recurring basis:    
Other assets 7 80
Liabilities measured at fair value on a recurring basis:    
Other liabilities 1,687 5,429
Assets measured at fair value on a nonrecurring basis:    
Other investments 6,077 11,090
Other real estate owned 11,846 200
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 7 80
Assets measured at fair value on a nonrecurring basis:    
Total assets measured at fair value 7 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 11,846 200
Total assets measured at fair value 17,923 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 6,077 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