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Fair Value (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Loans Receivable, Fair Value Disclosure $ 7,498,827,000   $ 7,498,827,000   $ 7,206,670,000      
Alternative Investment 50,571,000   50,571,000   45,885,000      
Loans Held-for-sale, Fair Value Disclosure 5,022,000   5,022,000   3,235,000      
Impaired Financing Receivable, Carrying Value 51,084,000   $ 51,084,000   40,232,000      
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     $ 5,070,000   2,349,000      
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 2,489,000   2,489,000   4,983,000      
Impaired Loan Fair Value 2,090,000   2,090,000   2,497,000      
Partial Charge-Offs On Impaired Loans carried at Fair Value     1,948,000   2,048,000      
Book Value Of Impaired Loans Carried At Fair Value 2,103,000   2,103,000   2,499,000      
Impaired Financing Receivable, carried at fair value, related expense 14,000 $ 275,000 71,000 $ 933,000        
MSR recorded at lower of cost or fair value 14,063,000 14,960,000 14,063,000 14,960,000 14,656,000 $ 14,271,000 $ 15,237,000 $ 15,792,000
Mortgage Servicing Rights Fair Value 500,000   500,000   900,000      
Valuation allowance of MSR 28,000 85,000 28,000 85,000 94,000 $ 28,000 $ 101,000 $ 182,000
MSRs recorded at cost 13,600,000   13,600,000   13,800,000      
Changes due to fair value adjustments 0 (16,000) (66,000) (97,000)        
Other Real Estate, Foreclosed Assets, and Repossessed Assets 1,119,000   1,119,000   983,000      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments 19,800,000   19,800,000   18,400,000      
Alternative Investment, income recognized 857,000 $ 924,000 75,000 683,000        
Other Real Estate, Valuation Adjustments     0 $ 77,000        
Fair Value Measured at Net Asset Value Per Share [Member]                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Alternative Investment 30,800,000   30,800,000   27,500,000      
Fair Value, Inputs, Level 3 [Member]                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Loans Receivable, Fair Value Disclosure 7,493,674,000   7,493,674,000   7,203,348,000      
Impaired Loan Fair Value 2,090,000   2,090,000   2,497,000      
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain]                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Impaired Financing Receivable, Related Allowance 13,000   13,000   2,000      
Financing Receivable, not collateral dependent [Domain]                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Impaired Financing Receivable, Related Allowance 2,476,000   2,476,000   4,981,000      
Fair Value, Nonrecurring [Member]                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Loans Receivable, Fair Value Disclosure 2,090,000   2,090,000   2,497,000      
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 2,090,000   2,090,000   2,497,000      
Other Real Estate, Foreclosed Assets, and Repossessed Assets $ 938,000   $ 938,000   $ 938,000