v3.26.3
LOANS AND THE ALLOWANCE FOR CREDIT LOSSES - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2026
USD ($)
loan
Mar. 31, 2026
USD ($)
Sep. 30, 2025
USD ($)
loan
Sep. 30, 2026
USD ($)
loan
Sep. 30, 2025
USD ($)
loan
Dec. 31, 2025
USD ($)
loan
Financing Receivable, Allowance for Credit Loss [Line Items]            
Loans (includes $1,146 and $3,182 measured at fair value, respectively) $ 2,810,837     $ 2,810,837   $ 2,649,484
Number of loans modified | loan 0   0   0  
Number of loans experiencing default | loan 0   0 1 0  
Financing receivable, subsequent default $ 0     $ 700    
Reversal of interest income on nonaccrual loans     $ 100   $ 100  
Number of OREO loans sold | loan           2
Gains (Losses) on Sales of Other Real Estate   $ 0       $ 500
Other real estate owned, net $ 0     $ 0   $ 3,040
Financing Receivable, Number of Loans Secured by Real Estate in Foreclosure Process | loan 0     0   0
Accrued interest receivable $ 10,600     $ 10,600   $ 10,400
Significant Unobservable Inputs (Level 3)            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit loss on non-performing loans 2,200     2,200   3,300
Consumer and other            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Loans (includes $1,146 and $3,182 measured at fair value, respectively) 20,414     20,414   22,778
Cash, securities, and other            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Loans (includes $1,146 and $3,182 measured at fair value, respectively) 177,382     177,382   164,726
Commercial and industrial            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Loans (includes $1,146 and $3,182 measured at fair value, respectively) 272,705     272,705   225,281
Owner occupied CRE            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Loans (includes $1,146 and $3,182 measured at fair value, respectively) 231,019     231,019   204,078
Simmons Bank            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Loans (includes $1,146 and $3,182 measured at fair value, respectively) $ 94,700     $ 94,700   $ 121,300