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Loans Receivable and Allowance for Loan Losses (Loan Portfolio Summarized by the Past Due Status) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Current	$ 1,401,327	$ 918,685
Past Due and still accruing	1,000
Non-Accrual	3,044	795
Total Past Due and Non-Accrual	6,560	5,295
Total Loans	1,416,473	924,676
Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	8,586	696
Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	2,126	1,218
Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	390	3,282
Residential Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Current	261,906	227,766
Non-Accrual	663	567
Total Past Due and Non-Accrual	1,376	1,539
Total Loans	263,404	229,781
Residential Real Estate Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	122	476
Residential Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	443	727
Residential Real Estate Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	270	245
Commercial Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Current	568,601	387,897
Non-Accrual	1,280	99
Total Past Due and Non-Accrual	1,751	3,210
Total Loans	574,123	391,327
Commercial Real Estate Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	3,771	220
Commercial Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	420	176
Commercial Real Estate Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	51	2,935
Agricultural Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Current	65,557
Non-Accrual	676
Total Past Due and Non-Accrual	705
Total Loans	68,340
Agricultural Real Estate Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	2,078
Agricultural Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	29
Construction Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Current	20,607	17,695
Total Past Due and Non-Accrual		37
Total Loans	20,797	17,732
Construction Real Estate Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	190
Construction Real Estate Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due		37
Commercial [Member]
Financing Receivable, Past Due [Line Items]
Current	283,130	134,018
Past Due and still accruing	1,000
Non-Accrual	23	50
Total Past Due and Non-Accrual	1,920	132
Total Loans	285,295	134,150
Commercial [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	245
Commercial [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	878	82
Commercial [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	19
Other Agricultural Loans [Member]
Financing Receivable, Past Due [Line Items]
Current	39,844
Non-Accrual	263
Total Past Due and Non-Accrual	273
Total Loans	42,297
Other Agricultural Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	2,180
Other Agricultural Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	10
Consumer Loans To Individuals [Member]
Financing Receivable, Past Due [Line Items]
Current	161,682	151,309
Non-Accrual	139	79
Total Past Due and Non-Accrual	535	377
Total Loans	162,217	151,686
Consumer Loans To Individuals [Member] | Financing Receivables, 31 to 60 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	346	233
Consumer Loans To Individuals [Member] | Financing Receivables, 61 to 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Past Due	$ 50	$ 65

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