Mergers and Acquisitions - Summary of Business Acquisitions, by Acquisition (Detail) - USD ($) $ in Thousands	May 01, 2020	Jun. 30, 2020	Dec. 31, 2019
Identifiable liabilities:
Preliminary resulting goodwill		$ 1,794,779	$ 1,478,014
Carolina Financial [Member]
Purchase price:
Value of common shares issued	$ 815,997
Fair value of stock options assumed	1,833
Cash for fractional shares	47
Total purchase price	817,877
Identifiable assets:
Cash and cash equivalents	629,154
Investment securities	580,849
Loans held for sale	65,757
Net Loans	3,242,812
Premises and equipment	83,859
Operating lease right-of-use asset	9,861
Crescent Mortgage trade name intangible	1,370
Core deposit intangible	3,037
Mortgage servicing rights	20,123
Other assets	166,175
Total identifiable assets	4,802,997
Identifiable liabilities:
Deposits	3,884,977
Short-term borrowings	332,000
Long-term borrowings	42,738
Operating lease liability	9,861
Other liabilities	32,309
Total identifiable liabilities	4,301,885
Preliminary fair value of net assets acquired including identifiable intangible assets	501,112
Preliminary resulting goodwill	$ 316,765