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Loans Receivable and Allowance for Credit Losses (Summary of Recorded Investment by Internal Risk Rating Systems) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 1,771,682,000 | $ 1,714,082,000
Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 57,899,000 | 171,467,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 162,557,000 | 114,199,000
Total Loans, Two Years Before Latest Fiscal Year | 108,919,000 | 167,819,000
Total Loans, Three Years Before Latest Fiscal Year | 164,865,000 | 133,394,000
Total Loans, Four Years Before Latest Fiscal Year | 130,100,000 | 81,861,000
Total Loans, Prior | 350,315,000 | 277,003,000
Revolving Loans Amortized Cost Basis | 80,830,000 | 76,688,000
Total | 1,055,485,000 | 1,022,431,000
Pass [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 57,899,000 | 171,327,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 162,418,000 | 113,922,000
Total Loans, Two Years Before Latest Fiscal Year | 108,648,000 | 167,103,000
Total Loans, Three Years Before Latest Fiscal Year | 164,171,000 | 130,222,000
Total Loans, Four Years Before Latest Fiscal Year | 126,788,000 | 80,456,000
Total Loans, Prior | 337,927,000 | 265,868,000
Revolving Loans Amortized Cost Basis | 77,913,000 | 73,768,000
Total | 1,035,764,000 | 1,002,666,000
Special Mention [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year |  | 5,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 4,000 |
Total Loans, Two Years Before Latest Fiscal Year |  | 287,000
Total Loans, Three Years Before Latest Fiscal Year | 283,000 |
Total Loans, Four Years Before Latest Fiscal Year | 216,000 |
Total Loans, Prior | 3,033,000 | 3,154,000
Revolving Loans Amortized Cost Basis | 163,000 | 164,000
Total | 3,699,000 | 3,610,000
Substandard [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year |  | 135,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 135,000 | 277,000
Total Loans, Two Years Before Latest Fiscal Year | 271,000 | 429,000
Total Loans, Three Years Before Latest Fiscal Year | 411,000 | 3,172,000
Total Loans, Four Years Before Latest Fiscal Year | 3,096,000 | 1,405,000
Total Loans, Prior | 9,355,000 | 7,981,000
Revolving Loans Amortized Cost Basis | 2,754,000 | 2,756,000
Total | 16,022,000 | 16,155,000
Commercial Real Estate Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 731,156,000 | 716,875,000
Commercial Real Estate Loans [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 25,605,000 | 102,913,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 101,567,000 | 74,242,000
Total Loans, Two Years Before Latest Fiscal Year | 73,057,000 | 122,143,000
Total Loans, Three Years Before Latest Fiscal Year | 120,718,000 | 107,181,000
Total Loans, Four Years Before Latest Fiscal Year | 105,626,000 | 62,346,000
Total Loans, Prior | 282,862,000 | 226,821,000
Revolving Loans Amortized Cost Basis | 21,721,000 | 21,229,000
Total | 731,156,000 | 716,875,000
Current period gross charge-offs, Prior | 49,000 |
Current period gross charge-offs, Total | 49,000 |
Commercial Real Estate Loans [Member] | Pass [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 25,605,000 | 102,773,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 101,428,000 | 74,242,000
Total Loans, Two Years Before Latest Fiscal Year | 73,057,000 | 121,881,000
Total Loans, Three Years Before Latest Fiscal Year | 120,459,000 | 104,720,000
Total Loans, Four Years Before Latest Fiscal Year | 103,005,000 | 60,941,000
Total Loans, Prior | 272,174,000 | 217,435,000
Revolving Loans Amortized Cost Basis | 21,321,000 | 20,829,000
Total | 717,049,000 | 702,821,000
Commercial Real Estate Loans [Member] | Special Mention [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year |  | 5,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 4,000 |
Total Loans, Two Years Before Latest Fiscal Year |  | 262,000
Total Loans, Three Years Before Latest Fiscal Year | 259,000 |
Total Loans, Four Years Before Latest Fiscal Year | 183,000 |
Total Loans, Prior | 2,075,000 | 2,148,000
Total | 2,521,000 | 2,415,000
Commercial Real Estate Loans [Member] | Substandard [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year |  | 135,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 135,000 |
Total Loans, Three Years Before Latest Fiscal Year |  | 2,461,000
Total Loans, Four Years Before Latest Fiscal Year | 2,438,000 | 1,405,000
Total Loans, Prior | 8,613,000 | 7,238,000
Revolving Loans Amortized Cost Basis | 400,000 | 400,000
Total | 11,586,000 | 11,639,000
Agricultural Real Estate Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 63,213,000 | 63,488,000
Agricultural Real Estate Loans [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 915,000 | 6,257,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 6,232,000 | 3,756,000
Total Loans, Two Years Before Latest Fiscal Year | 3,764,000 | 12,036,000
Total Loans, Three Years Before Latest Fiscal Year | 11,921,000 | 3,960,000
Total Loans, Four Years Before Latest Fiscal Year | 3,904,000 | 7,148,000
Total Loans, Prior | 35,924,000 | 29,811,000
Revolving Loans Amortized Cost Basis | 553,000 | 520,000
Total | 63,213,000 | 63,488,000
Agricultural Real Estate Loans [Member] | Pass [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 915,000 | 6,257,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 6,232,000 | 3,756,000
Total Loans, Two Years Before Latest Fiscal Year | 3,764,000 | 12,036,000
Total Loans, Three Years Before Latest Fiscal Year | 11,921,000 | 3,960,000
Total Loans, Four Years Before Latest Fiscal Year | 3,904,000 | 7,148,000
Total Loans, Prior | 35,315,000 | 29,038,000
Revolving Loans Amortized Cost Basis | 371,000 | 336,000
Total | 62,422,000 | 62,531,000
Agricultural Real Estate Loans [Member] | Special Mention [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Prior | 609,000 | 773,000
Revolving Loans Amortized Cost Basis | 150,000 | 150,000
Total | 759,000 | 923,000
Agricultural Real Estate Loans [Member] | Substandard [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Revolving Loans Amortized Cost Basis | 32,000 | 34,000
Total | 32,000 | 34,000
Commercial Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 233,479,000 | 211,991,000
Commercial Loans [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 31,152,000 | 57,939,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 51,113,000 | 34,365,000
Total Loans, Two Years Before Latest Fiscal Year | 30,426,000 | 29,919,000
Total Loans, Three Years Before Latest Fiscal Year | 28,738,000 | 19,874,000
Total Loans, Four Years Before Latest Fiscal Year | 18,335,000 | 10,233,000
Total Loans, Prior | 25,368,000 | 15,891,000
Revolving Loans Amortized Cost Basis | 48,347,000 | 43,770,000
Total | 233,479,000 | 211,991,000
Current period gross charge-offs, Fiscal Year Before Latest Fiscal Year |  | 11,000
Current period gross charge-offs, Four Years Before Latest Fiscal Year |  | 8,000
Current period gross charge-offs, Prior |  | 51,000
Current period gross charge-offs, Revolving loans amortized cost basis |  | 30,000
Current period gross charge-offs, Total |  | 100,000
Commercial Loans [Member] | Pass [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 31,152,000 | 57,939,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 51,113,000 | 34,088,000
Total Loans, Two Years Before Latest Fiscal Year | 30,155,000 | 29,465,000
Total Loans, Three Years Before Latest Fiscal Year | 28,303,000 | 19,163,000
Total Loans, Four Years Before Latest Fiscal Year | 17,644,000 | 10,233,000
Total Loans, Prior | 24,397,000 | 15,042,000
Revolving Loans Amortized Cost Basis | 47,484,000 | 42,906,000
Total | 230,248,000 | 208,836,000
Commercial Loans [Member] | Special Mention [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Two Years Before Latest Fiscal Year |  | 25,000
Total Loans, Three Years Before Latest Fiscal Year | 24,000 |
Total Loans, Four Years Before Latest Fiscal Year | 33,000 |
Total Loans, Prior | 229,000 | 106,000
Revolving Loans Amortized Cost Basis | 13,000 | 14,000
Total | 299,000 | 145,000
Commercial Loans [Member] | Substandard [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Fiscal Year Before Latest Fiscal Year |  | 277,000
Total Loans, Two Years Before Latest Fiscal Year | 271,000 | 429,000
Total Loans, Three Years Before Latest Fiscal Year | 411,000 | 711,000
Total Loans, Four Years Before Latest Fiscal Year | 658,000 |
Total Loans, Prior | 742,000 | 743,000
Revolving Loans Amortized Cost Basis | 850,000 | 850,000
Total | 2,932,000 | 3,010,000
Other Agricultural Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 27,637,000 | 30,077,000
Other Agricultural Loans [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 227,000 | 4,358,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 3,645,000 | 1,836,000
Total Loans, Two Years Before Latest Fiscal Year | 1,672,000 | 3,721,000
Total Loans, Three Years Before Latest Fiscal Year | 3,488,000 | 2,379,000
Total Loans, Four Years Before Latest Fiscal Year | 2,235,000 | 2,134,000
Total Loans, Prior | 6,161,000 | 4,480,000
Revolving Loans Amortized Cost Basis | 10,209,000 | 11,169,000
Total | 27,637,000 | 30,077,000
Current period gross charge-offs, Prior | 38,000 |
Current period gross charge-offs, Total | 38,000 |
Other Agricultural Loans [Member] | Pass [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 227,000 | 4,358,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 3,645,000 | 1,836,000
Total Loans, Two Years Before Latest Fiscal Year | 1,672,000 | 3,721,000
Total Loans, Three Years Before Latest Fiscal Year | 3,488,000 | 2,379,000
Total Loans, Four Years Before Latest Fiscal Year | 2,235,000 | 2,134,000
Total Loans, Prior | 6,041,000 | 4,353,000
Revolving Loans Amortized Cost Basis | 8,737,000 | 9,697,000
Total | 26,045,000 | 28,478,000
Other Agricultural Loans [Member] | Special Mention [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Prior | 120,000 | 127,000
Total | 120,000 | 127,000
Other Agricultural Loans [Member] | Substandard [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Revolving Loans Amortized Cost Basis | 1,472,000 | 1,472,000
Total | $ 1,472,000 | $ 1,472,000

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