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Loans Receivable and Allowance for Loan Losses (Loan Portfolio Summarized by the Past Due Status) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Total Loans	$ 1,412,289	$ 924,676
Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Current	1,397,574	918,685
Non-Accrual	3,391	795
Total Past Due and Non-Accrual	5,434	5,295
Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	9,281	696
Financing Receivables, 31 to 60 Days Past Due [Member] | Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Past Due	1,656	1,218
Financing Receivables, 61 to 90 Days Past Due [Member] | Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Past Due	387	3,282
Residential Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	263,127	229,781
Residential Real Estate Loans [Member] | Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Current	261,406	227,766
Non-Accrual	571	567
Total Past Due and Non-Accrual	1,130	1,539
Residential Real Estate Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	591	476
Residential Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] | Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Past Due	355	727
Residential Real Estate Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member] | Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Past Due	204	245
Commercial Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	579,104	391,327
Commercial Real Estate Loans [Member] | Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Current	573,376	387,897
Non-Accrual	1,674	99
Total Past Due and Non-Accrual	1,733	3,210
Commercial Real Estate Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	3,995	220
Commercial Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] | Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Past Due	59	176
Commercial Real Estate Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member] | Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Past Due		2,935
Agricultural Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	66,334
Agricultural Real Estate Loans [Member] | Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Current	63,615
Non-Accrual	676
Total Past Due and Non-Accrual	676
Agricultural Real Estate Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	2,043
Construction Real Estate Loans [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	21,005	17,732
Construction Real Estate Loans [Member] | Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Current	20,811	17,695
Total Past Due and Non-Accrual		37
Construction Real Estate Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	194
Construction Real Estate Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member] | Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Past Due		37
Commercial [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	283,741	134,150
Commercial [Member] | Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Current	282,374	134,018
Non-Accrual	22	50
Total Past Due and Non-Accrual	1,121	132
Commercial [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	246
Commercial [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] | Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Past Due	1,009	82
Commercial [Member] | Financing Receivables, 61 to 90 Days Past Due [Member] | Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Past Due	90
Other Agricultural Loans [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	40,929
Other Agricultural Loans [Member] | Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Current	38,454
Non-Accrual	263
Total Past Due and Non-Accrual	263
Other Agricultural Loans [Member] | Purchased Credit-Impaired [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	2,212
Consumer Loans To Individuals [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	158,049	151,686
Consumer Loans To Individuals [Member] | Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Current	157,538	151,309
Non-Accrual	185	79
Total Past Due and Non-Accrual	511	377
Consumer Loans To Individuals [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] | Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Past Due	233	233
Consumer Loans To Individuals [Member] | Financing Receivables, 61 to 90 Days Past Due [Member] | Company Originated [Member]
Financing Receivable, Past Due [Line Items]
Past Due	$ 93	$ 65

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