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Fair Values of Financial Instruments (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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Transfers between fair value hierarchy $ 0 $ 0 $ 0 $ 0        
Total Loans Receivable 3,125,647,000 3,322,139,000 3,125,647,000 3,322,139,000 $ 3,317,402,000      
Allowance for credit losses 34,693,000 $ 31,914,000 34,693,000 $ 31,914,000 33,608,000 $ 35,243,000 $ 30,205,000 $ 32,373,000
Fair Value, Recurring [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Liabilities 0   0   0      
Fair Value, Measurements, Nonrecurring [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Liabilities 0   0          
Impaired Loans [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Losses (recoveries) on impaired loans 3,300,000       1,400,000      
(Level 3) Significant Unobservable Inputs [Member] | Impaired Loans [Member]                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Total Loans Receivable 27,400,000   27,400,000   27,800,000      
Allowance for credit losses $ 6,100,000   $ 6,100,000   $ 4,200,000