Note 3 - Mergers and Acquisitions (Details Textual)				12 Months Ended
	Aug. 24, 2023 USD ($) $ / shares	Apr. 01, 2023 USD ($) shares	Jul. 10, 2021 USD ($)	Dec. 31, 2023 USD ($) $ / shares	Dec. 31, 2021 USD ($)	Dec. 31, 2022 USD ($) $ / shares
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares				$ 2.5		$ 2.5
Payments to Acquire Businesses, Gross				$ 595,000	$ 48,920,000
Assets				4,634,322,000		$ 3,916,692,000
Liabilities				4,194,114,000		3,562,162,000
Goodwill				$ 56,000,000		$ 55,300,000
PSB Holding Corp (PSB) [Member]
Business Acquisition, Effective Date of Acquisition		Apr. 01, 2023
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares, Per Share (in shares) | shares		1.2347
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable		$ 39,025,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | shares		1,880,732
Payments to Acquire Businesses, Gross		$ 595,000
Goodwill		687,000
Business Combination, Consideration Transferred		$ 39,620,000
PSB Holding Corp (PSB) [Member] | Core Deposits [Member]
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life (Year)		10 years
MVB [Member]
Business Acquisition, Effective Date of Acquisition			Jul. 10, 2021
Payments to Acquire Businesses, Gross			$ 9,807,000
Goodwill			10,331,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits Estimated			164,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Estimated			54,000,000
Business Combination, Consideration Transferred			$ 9,807,000
Business Combination, Period for Average Daily Closing Price of Deposits Prior to Closing (Day)			30 days
Business Combination, Percent Multiplier Used to Calculate Purchase Price			6.00%
MVB [Member] | WEST VIRGINIA
Number of Businesses Acquired			4
MVB [Member] | Kanawha County, West Virginia [Member]
Number of Businesses Acquired			1
MVB [Member] | Putnam County, West Virginia [Member]
Number of Businesses Acquired			1
MVB [Member] | Cabell County, West Virginia [Member]
Number of Businesses Acquired			2
MVB [Member] | Cabell County, West Virginia [Member] | Drive-up Banks [Member]
Number of Businesses Acquired			2
MVB [Member] | Core Deposits [Member]
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life (Year)			10 years
Burke & Herbert [Member]
Net Assets	$ 3,600,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares	$ 0.5
Burke & Herbert [Member] | Agreement and Plan of Reorganization, Merger [Member]
Business Acquisition, Effective Date of Acquisition	Jun. 30, 2024
Burke & Herbert [Member] | Agreement and Plan of Reorganization, Merger [Member]
Business Combination, Conversion of Stock, Ratio	0.5043
Summit [Member]
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares	$ 2.5
PSB Holding Corp (PSB) [Member]
Assets		$ 568,000,000
Liabilities		$ 528,000,000