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