Mergers and Acquisitions - Summary of Business Acquisitions, by Acquisition (Detail) - USD ($) $ in Thousands	Dec. 03, 2021	Jun. 30, 2022	Dec. 31, 2021
Purchase price:
Value of common shares issued	$ 252,321
Identifiable liabilities:
Preliminary resulting goodwill		$ 1,888,889	$ 1,886,494
Community Bankers Trust Corporation [Member]
Purchase price:
Value of common shares issued	252,321
Fair value of stock options assumed	7,958
Cash for fractional shares	25
Total purchase price	260,304
Identifiable assets:
Cash and cash equivalents	39,445
Investment securities	395,249
Net loans and leases	1,280,016
Premises and equipment	25,857
Operating lease right-of-use asset	8,127
Core deposit intangible	3,398
Other assets	50,851
Total identifiable assets	1,802,943
Identifiable liabilities:
Deposits	1,520,243
Short-term borrowings	26,755
Long-term borrowings	51,500
Operating lease liability	8,127
Other liabilities	14,863
Total identifiable liabilities	1,621,488
Preliminary fair value of net assets acquired including identifiable intangible assets	181,455
Preliminary resulting goodwill	$ 78,849