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Loans Receivable and Allowance for Credit Losses (Loan Portfolio Summarized by the Past Due Status) (Details) - USD ($) | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 1,621,680,000 | $ 1,603,877,000
Non-Accrual | 3,727,000 | 7,622,000
Company Originated [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual | 3,727,000 | 7,622,000
Total Past Due and Non-Accrual | 10,694,000 | 19,193,000
Purchased Credit-Impaired [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,621,680,000 | 1,603,877,000
Financing Receivables, 1 to 30 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,610,986,000 | 1,584,684,000
Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 6,277,000 | 11,223,000
Financing Receivables, 61 to 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 682,000 | 348,000
Financing Receivables, Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 8,000 |
Residential Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 313,531,000 | 316,546,000
Non-Accrual | 487,000 | 432,000
Residential Real Estate Loans [Member] | Company Originated [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual | 487,000 | 432,000
Total Past Due and Non-Accrual | 1,330,000 | 1,322,000
Residential Real Estate Loans [Member] | Purchased Credit-Impaired [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 313,531,000 | 316,546,000
Residential Real Estate Loans [Member] | Financing Receivables, 1 to 30 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 312,201,000 | 315,224,000
Residential Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 511,000 | 877,000
Residential Real Estate Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 332,000 | 13,000
Commercial Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 691,755,000 | 675,156,000
Non-Accrual | 2,200,000 | 2,211,000
Commercial Real Estate Loans [Member] | Company Originated [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual | 2,200,000 | 2,211,000
Total Past Due and Non-Accrual | 6,183,000 | 8,388,000
Commercial Real Estate Loans [Member] | Purchased Credit-Impaired [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 691,755,000 | 675,156,000
Commercial Real Estate Loans [Member] | Financing Receivables, 1 to 30 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 685,572,000 | 666,768,000
Commercial Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,983,000 | 6,177,000
Agricultural Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 62,309,000 | 63,859,000
Agricultural Real Estate Loans [Member] | Company Originated [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-Accrual |  | 127,000
Agricultural Real Estate Loans [Member] | Purchased Credit-Impaired [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 62,309,000 | 63,859,000
Agricultural Real Estate Loans [Member] | Financing Receivables, 1 to 30 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 62,309,000 | 63,732,000
Agricultural Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans |  | 127,000
Construction Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 47,409,000 | 51,453,000
Construction Real Estate Loans [Member] | Company Originated [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-Accrual | 17,000 | 18,000
Construction Real Estate Loans [Member] | Purchased Credit-Impaired [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 47,409,000 | 51,453,000
Construction Real Estate Loans [Member] | Financing Receivables, 1 to 30 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 47,392,000 | 51,435,000
Construction Real Estate Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 17,000 | 18,000
Commercial Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 204,006,000 | 200,576,000
Non-Accrual | 111,000 | 4,264,000
Commercial Loans [Member] | Company Originated [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual | 111,000 | 4,264,000
Total Past Due and Non-Accrual | 1,327,000 | 7,588,000
Commercial Loans [Member] | Purchased Credit-Impaired [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 204,006,000 | 200,576,000
Commercial Loans [Member] | Financing Receivables, 1 to 30 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 202,679,000 | 192,988,000
Commercial Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,194,000 | 3,170,000
Commercial Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 22,000 | 154,000
Other Agricultural Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 31,439,000 | 31,966,000
Non-Accrual | 185,000 |
Other Agricultural Loans [Member] | Company Originated [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual | 185,000 |
Total Past Due and Non-Accrual | 185,000 | 7,000
Other Agricultural Loans [Member] | Purchased Credit-Impaired [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 31,439,000 | 31,966,000
Other Agricultural Loans [Member] | Financing Receivables, 1 to 30 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 31,254,000 | 31,959,000
Other Agricultural Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans |  | 7,000
Consumer Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 271,231,000 | 264,321,000
Non-Accrual | 744,000 | 715,000
Consumer Loans [Member] | Company Originated [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Non-Accrual | 744,000 | 715,000
Total Past Due and Non-Accrual | 1,652,000 | 1,743,000
Consumer Loans [Member] | Purchased Credit-Impaired [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 271,231,000 | 264,321,000
Consumer Loans [Member] | Financing Receivables, 1 to 30 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 269,579,000 | 262,578,000
Consumer Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 589,000 | 865,000
Consumer Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 311,000 | $ 163,000
Consumer Loans [Member] | Financing Receivables, Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 8,000 |

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