v3.26.1
LOANS AND ALLOWANCE FOR CREDIT LOSSES ON LOANS (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Proceeds from the sale of mortgage loans $ 61,010 $ 42,320  
Gain on sale of mortgage loans (704) (497)  
Loans held for sale, at fair value (book value of $17,694 and $14,965, respectively) $ 17,618   $ 15,040
Other industry exposures 0    
Non-Accrual Loans $ 10,959   7,023
Loans outstanding 4,963,017   4,965,138
Loans and Leases Receivable, Excluded Accrued Interest from Amortized Cost 16,000   15,800
FHLB advances, general debt obligations, pledged collateral 2,300,000   2,300,000
Loans And Leases Receivable Impaired Interest Income Foregone 263 73  
Recoveries 164 171 535
Residential real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Proceeds from the sale of mortgage loans 61,000 42,300  
Gain on sale of mortgage loans (704) (497)  
Loans held for sale, at fair value (book value of $17,694 and $14,965, respectively) 17,600   15,000
Unrealized gain (loss) on loans held for sale (76)   75
Non-Accrual Loans 2,252   2,667
Loans outstanding 1,993,435   2,012,922
Mortgage Loans in Process of Foreclosure, Amount 669   709
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Period Increase (Decrease) 151 102  
Recoveries 6 6 25
Commercial real estate - non-owner-occupied      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-Accrual Loans 5,017   429
Loans outstanding 1,780,079   1,778,985
Recoveries 0 1 9
Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-Accrual Loans 2,689   3,042
Loans outstanding 414,694   417,439
Recoveries 152 110 428
Home equity      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-Accrual Loans 596   672
Loans outstanding 342,874   332,256
Recoveries 0 0 1
Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-Accrual Loans 2   3
Loans outstanding 16,273   17,416
Recoveries $ 2 $ 3 $ 12
Residential Building Operators Industry Sector | Loan Concentration Risk | Total Loan Portfolio      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Concentration risk (percentage) 12.00%    
Residential Building Operators Industry Sector | Total Commercial Real Estate Portfolio Segment | Total Loan Portfolio      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Concentration risk (percentage) 28.00%