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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, 2024 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 1,621,680,000 | $ 1,603,877,000
Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
2024 | 28,930,000 | 134,225,000
2023 | 129,958,000 | 194,063,000
2022 | 192,963,000 | 146,073,000
2021 | 150,323,000 | 94,987,000
2020 | 92,181,000 | 93,173,000
Prior | 324,164,000 | 239,295,000
Revolving Loans Amortized Cost Basis | 70,990,000 | 69,741,000
Total | 989,509,000 | 971,557,000
Pass [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
2024 | 28,930,000 | 132,372,000
2023 | 128,129,000 | 191,606,000
2022 | 185,073,000 | 145,229,000
2021 | 146,273,000 | 90,219,000
2020 | 89,083,000 | 92,513,000
Prior | 314,215,000 | 229,990,000
Revolving Loans Amortized Cost Basis | 65,579,000 | 63,589,000
Total | 957,282,000 | 945,518,000
Special Mention [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
2024 |  | 1,853,000
2023 | 1,829,000 | 1,823,000
2022 | 1,976,000 | 502,000
2021 | 299,000 | 1,650,000
2020 | 1,431,000 | 505,000
Prior | 7,221,000 | 6,835,000
Revolving Loans Amortized Cost Basis | 3,496,000 | 2,652,000
Total | 16,252,000 | 15,820,000
Substandard [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
2023 |  | 634,000
2022 | 5,914,000 | 342,000
2021 | 3,751,000 | 3,118,000
2020 | 1,667,000 | 155,000
Prior | 2,728,000 | 2,470,000
Revolving Loans Amortized Cost Basis | 1,915,000 | 3,500,000
Total | 15,975,000 | 10,219,000
Commercial Real Estate Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 691,755,000 | 675,156,000
Commercial Real Estate Loans [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
2024 | 11,173,000 | 79,796,000
2023 | 81,540,000 | 132,359,000
2022 | 134,179,000 | 112,345,000
2021 | 117,333,000 | 68,724,000
2020 | 68,968,000 | 72,516,000
Prior | 262,176,000 | 194,505,000
Revolving Loans Amortized Cost Basis | 16,386,000 | 14,911,000
Total | 691,755,000 | 675,156,000
Current period gross charge-offs, 2020 |  | 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] |  |
2024 | 11,173,000 | 78,496,000
2023 | 80,240,000 | 131,948,000
2022 | 130,611,000 | 112,102,000
2021 | 114,116,000 | 65,949,000
2020 | 66,212,000 | 72,480,000
Prior | 253,363,000 | 186,116,000
Revolving Loans Amortized Cost Basis | 13,664,000 | 13,332,000
Total | 669,379,000 | 660,423,000
Commercial Real Estate Loans [Member] | Special Mention [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
2024 |  | 1,300,000
2023 | 1,300,000 | 411,000
2022 | 624,000 | 243,000
2021 | 76,000 | 1,331,000
2020 | 1,321,000 |
Prior | 6,134,000 | 6,157,000
Revolving Loans Amortized Cost Basis | 2,722,000 | 1,579,000
Total | 12,177,000 | 11,021,000
Commercial Real Estate Loans [Member] | Substandard [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
2022 | 2,944,000 |
2021 | 3,141,000 | 1,444,000
2020 | 1,435,000 | 36,000
Prior | 2,679,000 | 2,232,000
Total | 10,199,000 | 3,712,000
Agricultural Real Estate Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 62,309,000 | 63,859,000
Agricultural Real Estate Loans [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
2024 | 1,154,000 | 2,635,000
2023 | 2,628,000 | 13,017,000
2022 | 12,369,000 | 5,433,000
2021 | 5,391,000 | 8,624,000
2020 | 7,502,000 | 8,145,000
Prior | 32,600,000 | 25,333,000
Revolving Loans Amortized Cost Basis | 665,000 | 672,000
Total | 62,309,000 | 63,859,000
Agricultural Real Estate Loans [Member] | Pass [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
2024 | 1,154,000 | 2,635,000
2023 | 2,628,000 | 12,509,000
2022 | 12,369,000 | 5,433,000
2021 | 5,391,000 | 7,606,000
2020 | 7,502,000 | 7,746,000
Prior | 31,805,000 | 24,654,000
Revolving Loans Amortized Cost Basis | 515,000 | 522,000
Total | 61,364,000 | 61,105,000
Agricultural Real Estate Loans [Member] | Special Mention [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
2020 |  | 399,000
Prior | 795,000 | 490,000
Revolving Loans Amortized Cost Basis | 150,000 | 150,000
Total | 945,000 | 1,039,000
Agricultural Real Estate Loans [Member] | Substandard [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
2023 |  | 508,000
2021 |  | 1,018,000
Prior |  | 189,000
Total |  | 1,715,000
Commercial Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 204,006,000 | 200,576,000
Commercial Loans [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
2024 | 16,042,000 | 49,124,000
2023 | 43,198,000 | 43,401,000
2022 | 41,598,000 | 25,042,000
2021 | 24,523,000 | 14,542,000
2020 | 12,748,000 | 9,934,000
Prior | 23,790,000 | 15,621,000
Revolving Loans Amortized Cost Basis | 42,107,000 | 42,912,000
Total | 204,006,000 | 200,576,000
Current period gross charge-offs, 2023 |  | 32,000
Current period gross charge-offs, 2022 |  | 24,000
Current period gross charge-offs, 2021 |  | 4,856,000
Current period gross charge-offs, 2020 | 4,000 |
Current period gross charge-offs, Prior | 51,000 | 41,000
Current period gross charge-offs, Total | 55,000 | 4,953,000
Commercial Loans [Member] | Pass [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
2024 | 16,042,000 | 48,571,000
2023 | 42,669,000 | 41,863,000
2022 | 37,276,000 | 24,443,000
2021 | 23,691,000 | 13,752,000
2020 | 12,591,000 | 9,914,000
Prior | 23,602,000 | 15,384,000
Revolving Loans Amortized Cost Basis | 39,648,000 | 38,644,000
Total | 195,519,000 | 192,571,000
Commercial Loans [Member] | Special Mention [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
2024 |  | 553,000
2023 | 529,000 | 1,412,000
2022 | 1,352,000 | 257,000
2021 | 222,000 | 134,000
2020 | 110,000 | 20,000
Prior | 139,000 | 188,000
Revolving Loans Amortized Cost Basis | 544,000 | 768,000
Total | 2,896,000 | 3,332,000
Commercial Loans [Member] | Substandard [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
2023 |  | 126,000
2022 | 2,970,000 | 342,000
2021 | 610,000 | 656,000
2020 | 47,000 |
Prior | 49,000 | 49,000
Revolving Loans Amortized Cost Basis | 1,915,000 | 3,500,000
Total | 5,591,000 | 4,673,000
Other Agricultural Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 31,439,000 | 31,966,000
Other Agricultural Loans [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
2024 | 561,000 | 2,670,000
2023 | 2,592,000 | 5,286,000
2022 | 4,817,000 | 3,253,000
2021 | 3,076,000 | 3,097,000
2020 | 2,963,000 | 2,578,000
Prior | 5,598,000 | 3,836,000
Revolving Loans Amortized Cost Basis | 11,832,000 | 11,246,000
Total | 31,439,000 | 31,966,000
Other Agricultural Loans [Member] | Pass [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
2024 | 561,000 | 2,670,000
2023 | 2,592,000 | 5,286,000
2022 | 4,817,000 | 3,251,000
2021 | 3,075,000 | 2,912,000
2020 | 2,778,000 | 2,373,000
Prior | 5,445,000 | 3,836,000
Revolving Loans Amortized Cost Basis | 11,752,000 | 11,091,000
Total | 31,020,000 | 31,419,000
Other Agricultural Loans [Member] | Special Mention [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
2022 |  | 2,000
2021 | 1,000 | 185,000
2020 |  | 86,000
Prior | 153,000 |
Revolving Loans Amortized Cost Basis | 80,000 | 155,000
Total | 234,000 | 428,000
Other Agricultural Loans [Member] | Substandard [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
2020 | 185,000 | 119,000
Total | $ 185,000 | $ 119,000

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