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Loans Receivable and Allowance for Credit Losses (Summary of Recorded investment in Loan Classes Based on Payment Activity) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total $ 1,621,680,000 $ 1,603,877,000
Based on Payment Activity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2024 33,875,000 178,300,000
2023 175,234,000 153,827,000
2022 145,134,000 89,184,000
2021 79,517,000 51,330,000
2020 47,133,000 28,551,000
Prior 118,982,000 98,851,000
Revolving Loans Amortized Cost Basis 32,296,000 32,277,000
Total 632,171,000 632,320,000
Performing [Member] | Based on Payment Activity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2024 33,875,000 178,189,000
2023 175,105,000 153,423,000
2022 144,734,000 89,066,000
2021 79,363,000 51,299,000
2020 47,112,000 28,452,000
Prior 118,466,000 98,517,000
Revolving Loans Amortized Cost Basis 32,277,000 32,227,000
Total 630,932,000 631,173,000
Nonperforming [Member] | Based on Payment Activity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2024   111,000
2023 129,000 404,000
2022 400,000 118,000
2021 154,000 31,000
2020 21,000 99,000
Prior 516,000 334,000
Revolving Loans Amortized Cost Basis 19,000 50,000
Total 1,239,000 1,147,000
Residential Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 313,531,000 316,546,000
Residential Real Estate Loans [Member] | Based on Payment Activity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2024 1,177,000 27,446,000
2023 28,172,000 62,178,000
2022 62,759,000 57,691,000
2021 56,633,000 35,357,000
2020 34,427,000 16,464,000
Prior 101,272,000 88,275,000
Revolving Loans Amortized Cost Basis 29,091,000 29,135,000
Total 313,531,000 316,546,000
Current period gross charge-offs, Prior   34,000
Current period gross charge-offs, Total   34,000
Residential Real Estate Loans [Member] | Performing [Member] | Based on Payment Activity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2024 1,177,000 27,446,000
2023 28,172,000 62,178,000
2022 62,759,000 57,691,000
2021 56,633,000 35,357,000
2020 34,427,000 16,406,000
Prior 100,804,000 87,951,000
Revolving Loans Amortized Cost Basis 29,072,000 29,085,000
Total 313,044,000 316,114,000
Residential Real Estate Loans [Member] | Nonperforming [Member] | Based on Payment Activity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2020   58,000
Prior 468,000 324,000
Revolving Loans Amortized Cost Basis 19,000 50,000
Total 487,000 432,000
Construction Real Estate Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 47,409,000 51,453,000
Construction Real Estate Loans [Member] | Based on Payment Activity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2024 4,881,000 23,500,000
2023 27,558,000 14,906,000
2022 11,894,000 6,791,000
2021 474,000 1,599,000
2020   1,829,000
Prior 292,000 624,000
Revolving Loans Amortized Cost Basis 2,310,000 2,204,000
Total 47,409,000 51,453,000
Construction Real Estate Loans [Member] | Performing [Member] | Based on Payment Activity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2024 4,881,000 23,500,000
2023 27,558,000 14,906,000
2022 11,894,000 6,791,000
2021 474,000 1,599,000
2020   1,829,000
Prior 292,000 624,000
Revolving Loans Amortized Cost Basis 2,310,000 2,204,000
Total 47,409,000 51,453,000
Consumer Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 271,231,000 264,321,000
Consumer Loans [Member] | Based on Payment Activity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2024 27,817,000 127,354,000
2023 119,504,000 76,743,000
2022 70,481,000 24,702,000
2021 22,410,000 14,374,000
2020 12,706,000 10,258,000
Prior 17,418,000 9,952,000
Revolving Loans Amortized Cost Basis 895,000 938,000
Total 271,231,000 264,321,000
Current period gross charge-offs, 2024   45,000
Current period gross charge-offs, 2023 67,000 710,000
Current period gross charge-offs, 2022 277,000 200,000
Current period gross charge-offs, 2021 72,000 35,000
Current period gross charge-offs, 2020 23,000 45,000
Current period gross charge-offs, Prior   28,000
Current period gross charge-offs, Revolving loans amortized cost basis   4,000
Current period gross charge-offs, Total 439,000 1,067,000
Consumer Loans [Member] | Performing [Member] | Based on Payment Activity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2024 27,817,000 127,243,000
2023 119,375,000 76,339,000
2022 70,081,000 24,584,000
2021 22,256,000 14,343,000
2020 12,685,000 10,217,000
Prior 17,370,000 9,942,000
Revolving Loans Amortized Cost Basis 895,000 938,000
Total 270,479,000 263,606,000
Consumer Loans [Member] | Nonperforming [Member] | Based on Payment Activity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
2024   111,000
2023 129,000 404,000
2022 400,000 118,000
2021 154,000 31,000
2020 21,000 41,000
Prior 48,000 10,000
Total $ 752,000 $ 715,000