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Fair Value (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans Receivable, Fair Value Disclosure $ 7,665,053,000   $ 7,594,692,000  
Alternative Investment 50,941,000   50,142,000  
Loans Held-for-sale, Fair Value Disclosure 4,903,000   5,550,000  
Impaired Financing Receivable, Carrying Value $ 46,674,000   51,850,000  
Discount percentage applied to real estate appraised values 15.00%      
Discount percentage applied to lot development appraised values 6.00%      
Partial Charge-Offs On Impaired Loans $ 3,416,000   5,009,000  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1,044,000   1,299,000  
Impaired Loan Fair Value 961,000   2,946,000  
Partial Charge-Offs On Impaired Loans carried at Fair Value 488,000   488,000  
Book Value Of Impaired Loans Carried At Fair Value 1,029,000   2,986,000  
Impaired Financing Receivable, carried at fair value, related expense 68,000 $ 35,000    
MSR recorded at lower of cost or fair value 13,760,000 14,435,000 13,918,000 $ 14,656,000
Mortgage Servicing Rights Fair Value 400,000   400,000  
Valuation allowance of MSR 17,000 69,000 19,000 $ 94,000
MSRs recorded at cost 13,400,000   13,500,000  
Changes due to fair value adjustments (2,000) (25,000)    
Other Real Estate, Foreclosed Assets, and Repossessed Assets 119,000   938,000  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments 16,200,000   $ 17,600,000  
Alternative Investment, income recognized 299,000 690,000    
Other Real Estate, Valuation Adjustments $ 39,000 $ 0    
Credit Spread Assumption 3.67%   3.67%  
Fair Value Measured at Net Asset Value Per Share [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Alternative Investment $ 34,800,000   $ 32,600,000  
Fair Value, Inputs, Level 3 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans Receivable, Fair Value Disclosure 7,660,018,000   7,589,057,000  
Impaired Loan Fair Value 961,000   2,946,000  
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Impaired Financing Receivable, Related Allowance 68,000   40,000  
Financing Receivable, not collateral dependent [Domain]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Impaired Financing Receivable, Related Allowance 976,000   1,259,000  
Fair Value, Nonrecurring [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans Receivable, Fair Value Disclosure 961,000   2,946,000  
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans Receivable, Fair Value Disclosure 961,000   2,946,000  
Other Real Estate, Foreclosed Assets, and Repossessed Assets $ 0   $ 938,000