Acquisitions Acquisitions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	Apr. 24, 2020	Jan. 01, 2020	Sep. 17, 2019	Dec. 31, 2019
Cornerstone Financial Services Inc. [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Business Acquisition, Share Price			$ 5,700.00
Business Acquisition, Share Price, Number Of Shares		570,000	228
Business Acquisition Combination of Equity and Cash, Cash			50.00%
Business Acquisition Combination of Equity and Cash, Common Stock			50.00%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets		$ 195,049		$ 195,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		176,333		$ 176,000
Goodwill		10,820
MVB [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	$ 38,417
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	188,236
Goodwill	14,670
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits	195,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans	35,300
Purchase Price	$ 50,300
Number of days of average daily closing balance of deposits prior to closing	30 days
Percent multiplier used to calculate purchase price	8.00%
As Recorded By Summit [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 12,965	29,691
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	37,315	195,034
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	188,834	176,165
Goodwill	14,665	10,822
Stock Consideration [Member] | Cornerstone Financial Services Inc. [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred		15,400
Stock Consideration [Member] | As Recorded By Summit [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred		15,441
Cash Consideration [Member] | Cornerstone Financial Services Inc. [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred		14,300
Cash Consideration [Member] | As Recorded By Summit [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 12,965	$ 14,250
Core Deposits [Member] | Cornerstone Financial Services Inc. [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		10 years
Core Deposits [Member] | MVB [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years