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Summary of Significant Accounting Policies - Narrative (Details)
 3 Months Ended 12 Months Ended
Jan. 01, 2025
USD ($)
Dec. 31, 2025
USD ($)
office
branch
Sep. 30, 2025
USD ($)
Jun. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2025
USD ($)
office
branch
segment
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Apr. 26, 2024
shares
Property, Plant and Equipment [Line Items]                          
Branches operated | branch   74               74      
Number of loan production offices | office   9               9      
Number of portfolio segments | segment                   4      
Allowance for Credit Losses, Qualitative Factor Adjustment   0.25%               0.25%      
Financing receivable, balance threshold to determine individual evaluation for impairment   $ 1,000,000.0               $ 1,000,000.0      
Retained earnings   1,172,394,000       $ 1,181,533,000       1,172,394,000 $ 1,181,533,000    
Deferred tax assets, net   $ 184,389,000       140,044,000       $ 184,389,000 140,044,000    
Average Servicing Asset Cost, Percentage   0.32%               0.32%      
Weighted average cost to service loans, per loan                   $ 75.01      
Servicing Asset at Amortized Cost, Other than Temporary Impairments                   0 0 $ 0  
Proceeds from sales of OREO                   0 63,000 2,109,000  
Operating loss carryforwards, annual limitation   $ 2,700,000               2,700,000      
Payments of Ordinary Dividends                   70,727,000 67,511,000 67,125,000  
Loss contingencies for all legal claims   484,000       664,000       484,000 664,000    
Net income   34,466,000 $ 30,776,000 $ (24,750,000) $ 21,096,000 $ 24,337,000 $ 24,159,000 $ 25,270,000 $ 25,864,000 61,588,000 $ 99,630,000 $ 133,673,000  
Territorial                          
Property, Plant and Equipment [Line Items]                          
Merger agreement, stock exchange ratio | shares                         0.8048
Cumulative Effect, Period of Adoption, Adjustment                          
Property, Plant and Equipment [Line Items]                          
Derecognition of Delayed Contribution Liability, Investments in Affordable Housing Partnerships   15,100,000               15,100,000      
Retained earnings   1,100,000               1,100,000      
Deferred tax assets, net   $ 472,000               $ 472,000      
ASU 2025-08                          
Property, Plant and Equipment [Line Items]                          
Net income $ 3,100,000                        
Minimum | Building                          
Property, Plant and Equipment [Line Items]                          
Property, Plant and Equipment, Useful Life   15 years               15 years      
Minimum | Furniture and Fixtures                          
Property, Plant and Equipment [Line Items]                          
Property, Plant and Equipment, Useful Life   3 years               3 years      
Minimum | Computer Equipment                          
Property, Plant and Equipment [Line Items]                          
Property, Plant and Equipment, Useful Life   1 year               1 year      
Minimum | Computer Software                          
Property, Plant and Equipment [Line Items]                          
Property, Plant and Equipment, Useful Life   1 year               1 year      
Maximum | Core Deposits                          
Property, Plant and Equipment [Line Items]                          
Amortization Period   15 years               15 years      
Maximum | Building                          
Property, Plant and Equipment [Line Items]                          
Property, Plant and Equipment, Useful Life   39 years               39 years      
Maximum | Furniture and Fixtures                          
Property, Plant and Equipment [Line Items]                          
Property, Plant and Equipment, Useful Life   10 years               10 years      
Maximum | Computer Equipment                          
Property, Plant and Equipment [Line Items]                          
Property, Plant and Equipment, Useful Life   5 years               5 years      
Maximum | Computer Software                          
Property, Plant and Equipment [Line Items]                          
Property, Plant and Equipment, Useful Life   5 years               5 years