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Loans Receivable and Allowance for Credit Losses (Summary of Recorded Investment by Internal Risk Rating Systems) (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 1,641,531,000 | $ 1,603,877,000
Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 61,163,000 | 134,225,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 124,051,000 | 194,063,000
Total Loans, Two Years Before Latest Fiscal Year | 186,285,000 | 146,073,000
Total Loans, Three Years Before Latest Fiscal Year | 143,835,000 | 94,987,000
Total Loans, Four Years Before Latest Fiscal Year | 88,885,000 | 93,173,000
Total Loans, Prior | 309,353,000 | 239,295,000
Revolving Loans Amortized Cost Basis | 72,542,000 | 69,741,000
Total | 986,114,000 | 971,557,000
Pass [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 61,163,000 | 132,372,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 123,463,000 | 191,606,000
Total Loans, Two Years Before Latest Fiscal Year | 179,762,000 | 145,229,000
Total Loans, Three Years Before Latest Fiscal Year | 136,951,000 | 90,219,000
Total Loans, Four Years Before Latest Fiscal Year | 87,417,000 | 92,513,000
Total Loans, Prior | 299,241,000 | 229,990,000
Revolving Loans Amortized Cost Basis | 67,910,000 | 63,589,000
Total | 955,907,000 | 945,518,000
Special Mention [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year |  | 1,853,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 588,000 | 1,823,000
Total Loans, Two Years Before Latest Fiscal Year | 734,000 | 502,000
Total Loans, Three Years Before Latest Fiscal Year | 3,110,000 | 1,650,000
Total Loans, Four Years Before Latest Fiscal Year |  | 505,000
Total Loans, Prior | 3,882,000 | 6,835,000
Revolving Loans Amortized Cost Basis | 2,637,000 | 2,652,000
Total | 10,951,000 | 15,820,000
Substandard [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Fiscal Year Before Latest Fiscal Year |  | 634,000
Total Loans, Two Years Before Latest Fiscal Year | 5,789,000 | 342,000
Total Loans, Three Years Before Latest Fiscal Year | 3,774,000 | 3,118,000
Total Loans, Four Years Before Latest Fiscal Year | 1,468,000 | 155,000
Total Loans, Prior | 6,230,000 | 2,470,000
Revolving Loans Amortized Cost Basis | 1,995,000 | 3,500,000
Total | 19,256,000 | 10,219,000
Commercial Real Estate Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 685,212,000 | 675,156,000
Commercial Real Estate Loans [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 26,939,000 | 79,796,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 79,865,000 | 132,359,000
Total Loans, Two Years Before Latest Fiscal Year | 132,750,000 | 112,345,000
Total Loans, Three Years Before Latest Fiscal Year | 114,302,000 | 68,724,000
Total Loans, Four Years Before Latest Fiscal Year | 66,749,000 | 72,516,000
Total Loans, Prior | 250,163,000 | 194,505,000
Revolving Loans Amortized Cost Basis | 14,444,000 | 14,911,000
Total | 685,212,000 | 675,156,000
Current period gross charge-offs, Four Years Before Latest Fiscal Year |  | 112,000
Current period gross charge-offs, Prior |  | 42,000
Current period gross charge-offs, Total |  | 154,000
Commercial Real Estate Loans [Member] | Pass [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 26,939,000 | 78,496,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 79,565,000 | 131,948,000
Total Loans, Two Years Before Latest Fiscal Year | 129,495,000 | 112,102,000
Total Loans, Three Years Before Latest Fiscal Year | 108,654,000 | 65,949,000
Total Loans, Four Years Before Latest Fiscal Year | 65,325,000 | 72,480,000
Total Loans, Prior | 241,147,000 | 186,116,000
Revolving Loans Amortized Cost Basis | 14,150,000 | 13,332,000
Total | 665,275,000 | 660,423,000
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 |  | 1,300,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 300,000 | 411,000
Total Loans, Two Years Before Latest Fiscal Year | 311,000 | 243,000
Total Loans, Three Years Before Latest Fiscal Year | 2,431,000 | 1,331,000
Total Loans, Prior | 2,835,000 | 6,157,000
Revolving Loans Amortized Cost Basis | 294,000 | 1,579,000
Total | 6,171,000 | 11,021,000
Commercial Real Estate Loans [Member] | Substandard [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Two Years Before Latest Fiscal Year | 2,944,000 |
Total Loans, Three Years Before Latest Fiscal Year | 3,217,000 | 1,444,000
Total Loans, Four Years Before Latest Fiscal Year | 1,424,000 | 36,000
Total Loans, Prior | 6,181,000 | 2,232,000
Total | 13,766,000 | 3,712,000
Agricultural Real Estate Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 60,963,000 | 63,859,000
Agricultural Real Estate Loans [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 2,002,000 | 2,635,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 2,515,000 | 13,017,000
Total Loans, Two Years Before Latest Fiscal Year | 12,261,000 | 5,433,000
Total Loans, Three Years Before Latest Fiscal Year | 4,132,000 | 8,624,000
Total Loans, Four Years Before Latest Fiscal Year | 7,430,000 | 8,145,000
Total Loans, Prior | 32,029,000 | 25,333,000
Revolving Loans Amortized Cost Basis | 594,000 | 672,000
Total | 60,963,000 | 63,859,000
Agricultural Real Estate Loans [Member] | Pass [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 2,002,000 | 2,635,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 2,515,000 | 12,509,000
Total Loans, Two Years Before Latest Fiscal Year | 12,261,000 | 5,433,000
Total Loans, Three Years Before Latest Fiscal Year | 4,132,000 | 7,606,000
Total Loans, Four Years Before Latest Fiscal Year | 7,430,000 | 7,746,000
Total Loans, Prior | 31,241,000 | 24,654,000
Revolving Loans Amortized Cost Basis | 444,000 | 522,000
Total | 60,025,000 | 61,105,000
Agricultural Real Estate Loans [Member] | Special Mention [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Four Years Before Latest Fiscal Year |  | 399,000
Total Loans, Prior | 788,000 | 490,000
Revolving Loans Amortized Cost Basis | 150,000 | 150,000
Total | 938,000 | 1,039,000
Agricultural Real Estate Loans [Member] | Substandard [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Fiscal Year Before Latest Fiscal Year |  | 508,000
Total Loans, Three Years Before Latest Fiscal Year |  | 1,018,000
Total Loans, Prior |  | 189,000
Total |  | 1,715,000
Commercial Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 208,658,000 | 200,576,000
Commercial Loans [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 30,567,000 | 49,124,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 39,263,000 | 43,401,000
Total Loans, Two Years Before Latest Fiscal Year | 36,732,000 | 25,042,000
Total Loans, Three Years Before Latest Fiscal Year | 22,693,000 | 14,542,000
Total Loans, Four Years Before Latest Fiscal Year | 12,059,000 | 9,934,000
Total Loans, Prior | 21,883,000 | 15,621,000
Revolving Loans Amortized Cost Basis | 45,461,000 | 42,912,000
Total | 208,658,000 | 200,576,000
Current period gross charge-offs, Fiscal Year Before Latest Fiscal Year |  | 32,000
Current period gross charge-offs, Two Years Before Latest Fiscal Year |  | 24,000
Current period gross charge-offs, Three Years Before Latest Fiscal Year |  | 4,856,000
Current period gross charge-offs, Four Years Before Latest Fiscal Year | 4,000 |
Current period gross charge-offs, Prior | 51,000 | 41,000
Current period gross charge-offs, Revolving loans amortized cost basis | 30,000 |
Current period gross charge-offs, Total | 85,000 | 4,953,000
Commercial Loans [Member] | Pass [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 30,567,000 | 48,571,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 38,975,000 | 41,863,000
Total Loans, Two Years Before Latest Fiscal Year | 33,464,000 | 24,443,000
Total Loans, Three Years Before Latest Fiscal Year | 21,458,000 | 13,752,000
Total Loans, Four Years Before Latest Fiscal Year | 12,015,000 | 9,914,000
Total Loans, Prior | 21,717,000 | 15,384,000
Revolving Loans Amortized Cost Basis | 42,745,000 | 38,644,000
Total | 200,941,000 | 192,571,000
Commercial Loans [Member] | Special Mention [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year |  | 553,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 288,000 | 1,412,000
Total Loans, Two Years Before Latest Fiscal Year | 423,000 | 257,000
Total Loans, Three Years Before Latest Fiscal Year | 678,000 | 134,000
Total Loans, Four Years Before Latest Fiscal Year |  | 20,000
Total Loans, Prior | 117,000 | 188,000
Revolving Loans Amortized Cost Basis | 721,000 | 768,000
Total | 2,227,000 | 3,332,000
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 |  | 126,000
Total Loans, Two Years Before Latest Fiscal Year | 2,845,000 | 342,000
Total Loans, Three Years Before Latest Fiscal Year | 557,000 | 656,000
Total Loans, Four Years Before Latest Fiscal Year | 44,000 |
Total Loans, Prior | 49,000 | 49,000
Revolving Loans Amortized Cost Basis | 1,995,000 | 3,500,000
Total | 5,490,000 | 4,673,000
Other Agricultural Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 31,281,000 | 31,966,000
Other Agricultural Loans [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 1,655,000 | 2,670,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 2,408,000 | 5,286,000
Total Loans, Two Years Before Latest Fiscal Year | 4,542,000 | 3,253,000
Total Loans, Three Years Before Latest Fiscal Year | 2,708,000 | 3,097,000
Total Loans, Four Years Before Latest Fiscal Year | 2,647,000 | 2,578,000
Total Loans, Prior | 5,278,000 | 3,836,000
Revolving Loans Amortized Cost Basis | 12,043,000 | 11,246,000
Total | 31,281,000 | 31,966,000
Other Agricultural Loans [Member] | Pass [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 1,655,000 | 2,670,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 2,408,000 | 5,286,000
Total Loans, Two Years Before Latest Fiscal Year | 4,542,000 | 3,251,000
Total Loans, Three Years Before Latest Fiscal Year | 2,707,000 | 2,912,000
Total Loans, Four Years Before Latest Fiscal Year | 2,647,000 | 2,373,000
Total Loans, Prior | 5,136,000 | 3,836,000
Revolving Loans Amortized Cost Basis | 10,571,000 | 11,091,000
Total | 29,666,000 | 31,419,000
Other Agricultural 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 |  | 2,000
Total Loans, Three Years Before Latest Fiscal Year | 1,000 | 185,000
Total Loans, Four Years Before Latest Fiscal Year |  | 86,000
Total Loans, Prior | 142,000 |
Revolving Loans Amortized Cost Basis | 1,472,000 | 155,000
Total | $ 1,615,000 | 428,000
Other Agricultural Loans [Member] | Substandard [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Four Years Before Latest Fiscal Year |  | 119,000
Total |  | $ 119,000

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