Loans Receivable and Allowance for Credit Losses (Loan Portfolio Summarized by the Past Due Status) (Details) - USD ($)	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Loans	$ 1,641,531,000	$ 1,603,877,000
Non-Accrual	7,641,000	7,622,000
Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	7,641,000	7,622,000
Total Past Due and Non-Accrual	10,688,000	19,193,000
Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Loans	1,641,531,000	1,603,877,000
Financial Asset, Not Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	1,630,843,000	1,584,684,000
Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	2,739,000	11,223,000
Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	308,000	348,000
Residential Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans	317,507,000	316,546,000
Non-Accrual	953,000	432,000
Residential Real Estate Loans [Member] | Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	953,000	432,000
Total Past Due and Non-Accrual	2,152,000	1,322,000
Residential Real Estate Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Loans	317,507,000	316,546,000
Residential Real Estate Loans [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	315,355,000	315,224,000
Residential Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	1,150,000	877,000
Residential Real Estate Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	49,000	13,000
Commercial Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans	685,212,000	675,156,000
Non-Accrual	5,780,000	2,211,000
Commercial Real Estate Loans [Member] | Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	5,780,000	2,211,000
Total Past Due and Non-Accrual	6,498,000	8,388,000
Commercial Real Estate Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Loans	685,212,000	675,156,000
Commercial Real Estate Loans [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	678,714,000	666,768,000
Commercial Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	718,000	6,177,000
Agricultural Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans	60,963,000	63,859,000
Agricultural Real Estate Loans [Member] | Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-Accrual	19,000	127,000
Agricultural Real Estate Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Loans	60,963,000	63,859,000
Agricultural Real Estate Loans [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	60,944,000	63,732,000
Agricultural Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	19,000	127,000
Construction Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans	48,030,000	51,453,000
Construction Real Estate Loans [Member] | Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-Accrual	39,000	18,000
Construction Real Estate Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Loans	48,030,000	51,453,000
Construction Real Estate Loans [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	47,991,000	51,435,000
Construction Real Estate Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	39,000	18,000
Commercial Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans	208,658,000	200,576,000
Non-Accrual	108,000	4,264,000
Commercial Loans [Member] | Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	108,000	4,264,000
Total Past Due and Non-Accrual	378,000	7,588,000
Commercial Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Loans	208,658,000	200,576,000
Commercial Loans [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	208,280,000	192,988,000
Commercial Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	236,000	3,170,000
Commercial Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	34,000	154,000
Other Agricultural Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans	31,281,000	31,966,000
Other Agricultural Loans [Member] | Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-Accrual		7,000
Other Agricultural Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Loans	31,281,000	31,966,000
Other Agricultural Loans [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	31,281,000	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	289,880,000	264,321,000
Non-Accrual	800,000	715,000
Consumer Loans [Member] | Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	800,000	715,000
Total Past Due and Non-Accrual	1,602,000	1,743,000
Consumer Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Loans	289,880,000	264,321,000
Consumer Loans [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	288,278,000	262,578,000
Consumer Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	616,000	865,000
Consumer Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	$ 186,000	$ 163,000