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Summary of Significant Accounting Policies - Narrative (Details)
 12 Months Ended
Dec. 31, 2024
USD ($)
office
segment
branch
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Property, Plant and Equipment [Line Items]      
Branches operated | branch 46    
Number of loan production offices | office 9    
Cash Reserve Deposit Required and Made $ 0 $ 0  
Number of portfolio segments | segment 4    
Allowance for Credit Losses, Qualitative Factor Adjustment 0.25%    
Financing receivable, balance threshold to determine individual evaluation for impairment $ 1,000,000    
Retained earnings 1,181,533,000 1,150,547,000  
Deferred tax assets, net $ 140,044,000 135,215,000  
Average Servicing Asset Cost, Percentage 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 63,000 2,109,000 524,000
Payments of Ordinary Dividends 67,511,000 67,125,000 $ 67,126,000
Loss contingencies for all legal claims 664,000 $ 535,000  
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    
Retained earnings 1,100,000    
Deferred tax assets, net $ 472,000    
Minimum | Building      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 15 years    
Minimum | Furniture and Fixtures      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 3 years    
Minimum | Computer Equipment      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 1 year    
Minimum | Computer Software, Intangible Asset      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 1 year    
Maximum | Core Deposits      
Property, Plant and Equipment [Line Items]      
Amortization Period 10 years    
Maximum | Building      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 39 years    
Maximum | Furniture and Fixtures      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 10 years    
Maximum | Computer Equipment      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 5 years    
Maximum | Computer Software, Intangible Asset      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 5 years