Loans Receivable and Allowance for Credit Losses (Loan Portfolio Summarized by the Past Due Status) (Details) - USD ($)	Jun. 30, 2025	Dec. 31, 2024
Financing Receivable, Past Due [Line Items]
Loans	$ 1,791,044,000	$ 1,714,082,000
Non-Accrual	8,091,000	7,720,000
Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	8,091,000	7,720,000
Total Past Due and Non-Accrual	11,739,000	10,962,000
Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Loans	1,791,044,000	1,714,082,000
Financial Asset, Not Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	1,779,305,000	1,703,120,000
Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	2,400,000	2,311,000
Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	1,248,000	777,000
Financing Receivables, Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans		154,000
Residential Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans	332,631,000	330,856,000
Non-Accrual	982,000	940,000
Residential Real Estate Loans [Member] \| Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	982,000	940,000
Total Past Due and Non-Accrual	1,659,000	1,278,000
Residential Real Estate Loans [Member] \| Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Loans	332,631,000	330,856,000
Residential Real Estate Loans [Member] \| Financial Asset, Not Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	330,972,000	329,578,000
Residential Real Estate Loans [Member] \| Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	128,000	70,000
Residential Real Estate Loans [Member] \| Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	549,000	268,000
Commercial Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans	736,969,000	716,875,000
Non-Accrual	5,710,000	5,743,000
Commercial Real Estate Loans [Member] \| Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	5,710,000	5,743,000
Total Past Due and Non-Accrual	7,370,000	7,054,000
Commercial Real Estate Loans [Member] \| Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Loans	736,969,000	716,875,000
Commercial Real Estate Loans [Member] \| Financial Asset, Not Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	729,599,000	709,821,000
Commercial Real Estate Loans [Member] \| Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	1,319,000	1,182,000
Commercial Real Estate Loans [Member] \| Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	341,000	129,000
Agricultural Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans	62,077,000	63,488,000
Agricultural Real Estate Loans [Member] \| Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-Accrual	48,000
Agricultural Real Estate Loans [Member] \| Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Loans	62,077,000	63,488,000
Agricultural Real Estate Loans [Member] \| Financial Asset, Not Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	62,029,000	63,488,000
Agricultural Real Estate Loans [Member] \| Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	48,000
Construction Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans	68,013,000	53,020,000
Non-Accrual	50,000
Construction Real Estate Loans [Member] \| Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	50,000
Total Past Due and Non-Accrual	50,000	11,000
Construction Real Estate Loans [Member] \| Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Loans	68,013,000	53,020,000
Construction Real Estate Loans [Member] \| Financial Asset, Not Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	67,963,000	53,009,000
Construction Real Estate Loans [Member] \| Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans		11,000
Commercial Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans	229,182,000	211,991,000
Non-Accrual	145,000	127,000
Commercial Loans [Member] \| Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	145,000	127,000
Total Past Due and Non-Accrual	350,000	471,000
Commercial Loans [Member] \| Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Loans	229,182,000	211,991,000
Commercial Loans [Member] \| Financial Asset, Not Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	228,832,000	211,520,000
Commercial Loans [Member] \| Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	128,000	194,000
Commercial Loans [Member] \| Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	77,000	117,000
Commercial Loans [Member] \| Financing Receivables, Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans		33,000
Other Agricultural Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans	27,132,000	30,077,000
Other Agricultural Loans [Member] \| Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due and Non-Accrual		49,000
Other Agricultural Loans [Member] \| Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Loans	27,132,000	30,077,000
Other Agricultural Loans [Member] \| Financial Asset, Not Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	27,132,000	30,028,000
Other Agricultural Loans [Member] \| Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans		49,000
Consumer Loans [Member]
Financing Receivable, Past Due [Line Items]
Loans	335,040,000	307,775,000
Non-Accrual	1,204,000	910,000
Consumer Loans [Member] \| Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	1,204,000	910,000
Total Past Due and Non-Accrual	2,262,000	2,099,000
Consumer Loans [Member] \| Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Loans	335,040,000	307,775,000
Consumer Loans [Member] \| Financial Asset, Not Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	332,778,000	305,676,000
Consumer Loans [Member] \| Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	825,000	805,000
Consumer Loans [Member] \| Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans	$ 233,000	263,000
Consumer Loans [Member] \| Financing Receivables, Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans		$ 121,000

Recorded investment in financing receivables that are either past due or on nonaccrual status at the balance sheet date.

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Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease.

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