Loans, Primary Segments Portfolio and Accretable Yield for PCI Loans (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	$ 1,478,695		$ 1,441,533
Individually evaluated for impairment	15,612		15,533
Loans acquired with deteriorated credit quality	3,727		3,802
Collectively evaluated for impairment	1,459,356		1,422,198
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Allowance for loan losses	17,556		17,304
Individually evaluated for impairment	510		121
Allowance for loan losses related to loans acquired with deteriorated credit quality	0		0
Collectively evaluated for impairment	17,046		17,183
Loans and Leases Receivable, Net Amount [Abstract]
Net loans	1,461,139		1,424,229
Net loans, individually evaluated for impairment	15,102		15,412
Net loans, loans acquired with deteriorated credit quality	3,727		3,802
Net loans, collectively evaluated for impairment	1,442,310		1,405,015
Loans originated			24,300
Outstanding principal balances	2,800		6,800
Maximum amount of loan forgiven by guidance from SBA	150
Proceeds from loans receivable	150
Deferred fees	109
Changes in the accretable yield for purchased credit-impaired loans [Roll Forward]
Balance at beginning of period	370	$ 788	788
Reclassification of non-accretable discount	228	0
Accretion	(203)	(100)
Balance at end of period	395	$ 688	370
Loans acquired with specific evidence of deterioration in credit quality [Abstract]
Outstanding balance	6,584		6,159
Carrying amount	$ 3,727		3,802
Minimum [Member]
Loans and Leases Receivable, Net Amount [Abstract]
Number of days past for loan to be considered impaired, Minimum	90 days
First Mortgage [Member] | Minimum [Member]
Loans and Leases Receivable, Net Amount [Abstract]
Period of mortgage on real estate	15 years
First Mortgage [Member] | Maximum [Member]
Loans and Leases Receivable, Net Amount [Abstract]
Period of mortgage on real estate	30 years
Second Mortgage [Member] | Maximum [Member]
Loans and Leases Receivable, Net Amount [Abstract]
Period of mortgage on real estate	15 years
Real Estate Loans [Member] | Residential [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	$ 201,567		201,097
Individually evaluated for impairment	602		620
Loans acquired with deteriorated credit quality	12		14
Collectively evaluated for impairment	200,953		200,463
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Individually evaluated for impairment	11		12
Collectively evaluated for impairment	1,059		1,135
Real Estate Loans [Member] | Commercial [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	724,876		687,338
Individually evaluated for impairment	8,189		8,381
Loans acquired with deteriorated credit quality	2,109		2,145
Collectively evaluated for impairment	714,578		676,812
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Individually evaluated for impairment	56		61
Collectively evaluated for impairment	8,338		8,038
Real Estate Loans [Member] | Agricultural [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	305,517		312,011
Individually evaluated for impairment	5,288		5,355
Loans acquired with deteriorated credit quality	1,606		1,643
Collectively evaluated for impairment	298,623		305,013
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Individually evaluated for impairment	14		14
Collectively evaluated for impairment	4,502		4,715
Real Estate Loans [Member] | Construction [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	66,738		55,036
Individually evaluated for impairment	0		0
Loans acquired with deteriorated credit quality	0		0
Collectively evaluated for impairment	66,738		55,036
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	497		434
Consumer [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	21,460		25,858
Individually evaluated for impairment	0		0
Loans acquired with deteriorated credit quality	0		0
Collectively evaluated for impairment	21,460		25,858
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	210		262
Other Commercial Loans [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	69,051		74,585
Individually evaluated for impairment	612		186
Loans acquired with deteriorated credit quality	0		0
Collectively evaluated for impairment	68,439		74,399
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Individually evaluated for impairment	429		34
Collectively evaluated for impairment	951		989
Other Agricultural Loans [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	39,904		39,852
Individually evaluated for impairment	921		991
Loans acquired with deteriorated credit quality	0		0
Collectively evaluated for impairment	38,983		38,861
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	551		558
State and Political Subdivision Loans [Member]
Segments of loan portfolio and allowance for loan losses [Abstract]
Total financing receivables	49,582		45,756
Individually evaluated for impairment	0		0
Loans acquired with deteriorated credit quality	0		0
Collectively evaluated for impairment	49,582		45,756
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	285		$ 281
MidCoast Community Bancorp, Inc [Member]
Loans acquired with specific evidence of deterioration in credit quality [Abstract]
Carrying amount	$ 3,444