Acquisition (Narrative) (Details)		1 Months Ended	12 Months Ended
	May 01, 2020 USD ($) item $ / shares shares	Feb. 28, 2021 USD ($) item $ / shares shares	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($)	Apr. 30, 2020 USD ($)
Business Acquisition [Line Items]
Goodwill				$ 7,053,000	$ 209,000
Fair value premium				381,088,000	180,557,000
Merger-related expenses				$ 2,452,000	$ 440,000
MNB Corporation [Member]
Business Acquisition [Line Items]
Number of banks held | item	1
Fair value of assets acquired including goodwill	$ 451,400,000
Loans	245,300,000					$ 245,283,000
Deposits	395,600,000
Goodwill	$ 6,843,000
Exchange ratio | shares	1.039
Shares issued | shares	1,176,970
Equity portion of purchase price	$ 45,407,503
Acquisition transaction value	$ 45,411,000
Cash consideration (per share) | $ / shares	$ 43.77
Fair value, preliminary and subject to refinement, period				1 year
Number of separate fair valuation methodology employed | item				3
Fair value premium	$ 3,900,000
Loans receivable with gross amortized cost basis						250,300,000
Interest rate fair value adjustment on pools of homogeneous loans						3,335,000
Credit fair value discount						$ 6,863,000
Number of branches where leases were assumed | item	4
Core deposit intangibles, useful life				10 years
MNB Corporation [Member] | Merchants Bank [Member]
Business Acquisition [Line Items]
Number of bank centers | item	9
Landmark Bancorp, Inc. [Member] | Forecast [Member]
Business Acquisition [Line Items]
Merger-related expenses			$ 3,700,000
Subsequent Event [Member] | Landmark Bancorp, Inc. [Member] | Pending Acquisition [Member]
Business Acquisition [Line Items]
Number of bank centers | item		5
Exchange ratio | shares		0.272
Acquisition transaction value		$ 43,400,000
Cash consideration (per share) | $ / shares		$ 3.26