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Loans Receivable and Allowance for Loan Losses (Loan Portfolio Summarized by the Past Due Status) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Current	$ 1,408,933	$ 1,397,574
Non-Accrual	3,198	3,391
Total Past Due and Non-Accrual	6,230	5,434
Total Loans	1,424,328	1,412,289
Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	9,165	9,281
Total Loans	1,424,328	1,412,289
Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	2,889	1,656
Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	143	387
Residential Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Current	259,978	261,406
Non-Accrual	417	571
Total Past Due and Non-Accrual	890	1,130
Total Loans	261,450	263,127
Residential Real Estate Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	582	591
Total Loans	261,450	263,127
Residential Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	413	355
Residential Real Estate Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	60	204
Commercial Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Current	575,207	573,376
Non-Accrual	1,638	1,674
Total Past Due and Non-Accrual	2,156	1,733
Total Loans	581,329	579,104
Commercial Real Estate Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	3,966	3,995
Total Loans	581,329	579,104
Commercial Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	518	59
Agricultural Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Current	62,176	63,615
Non-Accrual	676	676
Total Past Due and Non-Accrual	772	676
Total Loans	64,954	66,334
Agricultural Real Estate Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	2,006	2,043
Total Loans	64,954	66,334
Agricultural Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	96
Construction Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Current	20,039	20,811
Total Loans	20,237	21,005
Construction Real Estate Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	198	194
Total Loans	20,237	21,005
Commercial [Member]
Financing Receivable, Past Due [Line Items]
Current	300,486	282,374
Non-Accrual	38	22
Total Past Due and Non-Accrual	1,705	1,121
Total Loans	302,431	283,741
Commercial [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	240	246
Total Loans	302,431	283,741
Commercial [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	1,667	1,009
Commercial [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due		90
Other Agricultural Loans [Member]
Financing Receivable, Past Due [Line Items]
Current	37,587	38,454
Non-Accrual	308	263
Total Past Due and Non-Accrual	362	263
Total Loans	40,122	40,929
Other Agricultural Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	2,173	2,212
Total Loans	40,122	40,929
Other Agricultural Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	54
Consumer Loans To Individuals [Member]
Financing Receivable, Past Due [Line Items]
Current	153,460	157,538
Non-Accrual	121	185
Total Past Due and Non-Accrual	345	511
Total Loans	153,805	158,049
Consumer Loans To Individuals [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	153,805	158,049
Consumer Loans To Individuals [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	141	233
Consumer Loans To Individuals [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	$ 83	$ 93

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