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FAIR VALUE DISCLOSURES OF FINANCIAL ASSETS AND LIABILITIES - Schedule of Financial Instruments Carried at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale $ 3,737,119 $ 3,846,537
Collateralized mortgage obligation (CMO)    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 455,483 464,619
Fannie Mae (FNMA) mortgage-backed securities (MBS)    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 2,939,887 3,042,350
Freddie Mac (FHLMC) MBS    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 111,807 115,532
Ginnie Mae (GNMA) MBS    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 43,823 43,340
Government-sponsored enterprises (GSE) agency notes    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 186,119 180,696
Fair Value, Measurements, Recurring    
Assets measured at fair value on a recurring basis:    
Other assets, fair value 166,395 153,647
Liabilities measured at fair value on a recurring basis:    
Other liabilities 141,305 151,642
Assets measured at fair value on a nonrecurring basis:    
Total assets measured at fair value 3,903,514 4,000,184
Fair Value, Measurements, Recurring | Collateralized mortgage obligation (CMO)    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 455,483 464,619
Fair Value, Measurements, Recurring | Fannie Mae (FNMA) mortgage-backed securities (MBS)    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 2,939,887 3,042,350
Fair Value, Measurements, Recurring | Freddie Mac (FHLMC) MBS    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 111,807 115,532
Fair Value, Measurements, Recurring | Ginnie Mae (GNMA) MBS    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 43,823 43,340
Fair Value, Measurements, Recurring | Government-sponsored enterprises (GSE) agency notes    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 186,119 180,696
Fair Value, Measurements, Nonrecurring    
Assets measured at fair value on a nonrecurring basis:    
Other real estate owned 1,301 1,569
Total assets measured at fair value 57,744 46,043
Fair Value, Measurements, Nonrecurring | Other investments    
Assets measured at fair value on a nonrecurring basis:    
Other investments 14,322 15,206
Fair Value, Measurements, Nonrecurring | Loans held for sale    
Assets measured at fair value on a nonrecurring basis:    
Loans held for sale 42,121 29,268
Quoted Prices in Active Markets for Identical Asset (Level 1) | Fair Value, Measurements, Recurring    
Assets measured at fair value on a recurring basis:    
Other assets, fair value 0 0
Liabilities measured at fair value on a recurring basis:    
Other liabilities 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) | Fair Value, Measurements, Recurring | Collateralized mortgage obligation (CMO)    
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) | Fair Value, Measurements, Recurring | Fannie Mae (FNMA) mortgage-backed securities (MBS)    
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) | Fair Value, Measurements, Recurring | Freddie Mac (FHLMC) MBS    
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) | Fair Value, Measurements, Recurring | Ginnie Mae (GNMA) MBS    
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) | Fair Value, Measurements, Recurring | Government-sponsored enterprises (GSE) agency notes    
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) | Fair Value, Measurements, Nonrecurring    
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) | Fair Value, Measurements, Nonrecurring | Other investments    
Assets measured at fair value on a nonrecurring basis:    
Other investments 0 0
Quoted Prices in Active Markets for Identical Asset (Level 1) | Fair Value, Measurements, Nonrecurring | Loans held for sale    
Assets measured at fair value on a nonrecurring basis:    
Loans held for sale 0 0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring    
Assets measured at fair value on a recurring basis:    
Other assets, fair value 166,339 153,569
Liabilities measured at fair value on a recurring basis:    
Other liabilities 133,020 137,616
Assets measured at fair value on a nonrecurring basis:    
Total assets measured at fair value 3,903,458 4,000,106
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Collateralized mortgage obligation (CMO)    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 455,483 464,619
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Fannie Mae (FNMA) mortgage-backed securities (MBS)    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 2,939,887 3,042,350
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Freddie Mac (FHLMC) MBS    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 111,807 115,532
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Ginnie Mae (GNMA) MBS    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 43,823 43,340
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Government-sponsored enterprises (GSE) agency notes    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 186,119 180,696
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring    
Assets measured at fair value on a nonrecurring basis:    
Other real estate owned 0 0
Total assets measured at fair value 42,121 29,268
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring | Other investments    
Assets measured at fair value on a nonrecurring basis:    
Other investments 0 0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring | Loans held for sale    
Assets measured at fair value on a nonrecurring basis:    
Loans held for sale 42,121 29,268
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring    
Assets measured at fair value on a recurring basis:    
Other assets, fair value 56 78
Liabilities measured at fair value on a recurring basis:    
Other liabilities 8,285 14,026
Assets measured at fair value on a nonrecurring basis:    
Total assets measured at fair value 56 78
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Collateralized mortgage obligation (CMO)    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 0 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Fannie Mae (FNMA) mortgage-backed securities (MBS)    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 0 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Freddie Mac (FHLMC) MBS    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 0 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Ginnie Mae (GNMA) MBS    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 0 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Government-sponsored enterprises (GSE) agency notes    
Assets measured at fair value on a recurring basis:    
Investment securities available-for-sale 0 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring    
Assets measured at fair value on a nonrecurring basis:    
Other real estate owned 1,301 1,569
Total assets measured at fair value 15,623 16,775
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring | Other investments    
Assets measured at fair value on a nonrecurring basis:    
Other investments 14,322 15,206
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring | Loans held for sale    
Assets measured at fair value on a nonrecurring basis:    
Loans held for sale $ 0 $ 0