Loans Receivable and Allowance for Credit Losses (Summary of Amount of Loans in Each Category that were Individually and Collectively Evaluated for Impairment) (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	$ 7,622,000	$ 463,000
Loans acquired with deteriorated credit quality		6,290,000
Collectively evaluated for impairment	1,596,255,000	1,467,671,000
Total	1,603,877,000	1,474,424,000
Residential Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	432,000
Loans acquired with deteriorated credit quality		567,000
Collectively evaluated for impairment	316,114,000	298,246,000
Total	316,546,000	298,813,000
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	2,211,000	402,000
Loans acquired with deteriorated credit quality		2,049,000
Collectively evaluated for impairment	672,945,000	649,093,000
Total	675,156,000	651,544,000
Agricultural Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans acquired with deteriorated credit quality		2,034,000
Collectively evaluated for impairment	63,859,000	66,881,000
Total	63,859,000	68,915,000
Construction Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for impairment	51,453,000	32,469,000
Total	51,453,000	32,469,000
Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	4,264,000	61,000
Loans acquired with deteriorated credit quality		1,640,000
Collectively evaluated for impairment	196,312,000	185,556,000
Total	200,576,000	187,257,000
Other Agricultural Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for impairment	31,966,000	35,277,000
Total	31,966,000	35,277,000
Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	715,000
Collectively evaluated for impairment	263,606,000	200,149,000
Total	$ 264,321,000	$ 200,149,000