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Impact of Recently Issued Accounting Standards (Details) - USD ($)
Sep. 30, 2023
Jun. 30, 2023
Jan. 01, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Securities to be held to maturity, allowance for credit loss $ 432,000 [1]     $ 0 $ 0    
Allowance for loan losses 23,322,000 $ 23,465,000   16,723,000 16,387,000 $ 16,201,000 $ 15,521,000
Unfunded commitments 1,486,000     100,000      
Decrease to retained earnings (226,665,000) (232,003,000)   (228,923,000) (219,917,000) (227,685,000) (245,657,000)
Retained earnings              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Decrease to retained earnings $ (209,132,000) $ (205,539,000)   (204,343,000) $ (198,902,000) $ (192,565,000) $ (180,417,000)
Cumulative Effect, Period of Adoption, Adjustment              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Securities to be held to maturity, allowance for credit loss     $ 438,000 438,000      
Allowance for loan losses     6,210,000 6,210,000      
Unfunded commitments     1,297,000 1,297,000      
Decrease to retained earnings       6,277,000      
Cumulative Effect, Period of Adoption, Adjustment | Retained earnings              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Decrease to retained earnings     $ 6,277,000 $ 6,277,000      
[1] December 31, 2022 and September 30, 2022 had no allowance for credit losses