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Loans Receivable and Allowance for Loan Losses (Loan Portfolio Summarized by the Past Due Status) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Current	$ 1,375,409	$ 1,397,574
Non-Accrual	3,940	3,391
Total Past Due and Non-Accrual	5,813	5,434
Total Loans	1,389,620	1,412,289
Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	8,398	9,281
Total Loans	1,389,620	1,412,289
Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	1,255	1,656
Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	618	387
Residential Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Current	256,368	261,406
Non-Accrual	486	571
Total Past Due and Non-Accrual	1,190	1,130
Total Loans	258,130	263,127
Residential Real Estate Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	572	591
Total Loans	258,130	263,127
Residential Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	350	355
Residential Real Estate Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	354	204
Commercial Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Current	592,870	573,376
Non-Accrual	1,118	1,674
Total Past Due and Non-Accrual	1,576	1,733
Total Loans	597,906	579,104
Commercial Real Estate Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	3,460	3,995
Total Loans	597,906	579,104
Commercial Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	253	59
Commercial Real Estate Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	205
Agricultural Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Current	61,663	63,615
Non-Accrual	676	676
Total Past Due and Non-Accrual	676	676
Total Loans	64,245	66,334
Agricultural Real Estate Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	1,906	2,043
Total Loans	64,245	66,334
Construction Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Current	21,637	20,811
Total Loans	21,839	21,005
Construction Real Estate Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	202	194
Total Loans	21,839	21,005
Commercial [Member]
Financing Receivable, Past Due [Line Items]
Current	249,414	282,374
Non-Accrual	1,169	22
Total Past Due and Non-Accrual	1,327	1,121
Total Loans	250,872	283,741
Commercial [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	131	246
Total Loans	250,872	283,741
Commercial [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	105	1,009
Commercial [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	53	90
Other Agricultural Loans [Member]
Financing Receivable, Past Due [Line Items]
Current	39,020	38,454
Non-Accrual	308	263
Total Past Due and Non-Accrual	689	263
Total Loans	41,836	40,929
Other Agricultural Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	2,127	2,212
Total Loans	41,836	40,929
Other Agricultural Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	381
Consumer Loans To Individuals [Member]
Financing Receivable, Past Due [Line Items]
Current	154,437	157,538
Non-Accrual	183	185
Total Past Due and Non-Accrual	355	511
Total Loans	154,792	158,049
Consumer Loans To Individuals [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	154,792	158,049
Consumer Loans To Individuals [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	166	233
Consumer Loans To Individuals [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	$ 6	$ 93

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