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Mergers and Acquisitions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Nov. 22, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021
Business Acquisition [Line Items]
Total Assets		$ 16,425,610		$ 16,927,125
Old Line [Member]
Business Acquisition [Line Items]
Total Assets	$ 3,000,000
Portfolio loans, net of unearned income	2,500,000
Securities	182,171
Value of acquisition	$ 493,952
Closing stock price	$ 36.75
Number of shares issued for acquisition	13,351,837
Business acquisition, fair value	$ 3,300
Goodwill acquired	231,814
Purchase price allocation in core deposit intangible	32,899
Merger related expense		$ 6,500	$ 13,200
Cash consideration for outstanding shares	16
Community Banking [Member] \| Old Line [Member]
Business Acquisition [Line Items]
Purchase price allocation in core deposit intangible	$ 32,900