Mergers and Acquisitions - Summary of Reconciliation of Difference Between Purchase Price and Par Value of Purchase Credit Loans Acquired (Detail) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
	May 01, 2020	Jun. 30, 2020	Jun. 30, 2020
Disclosure Detail of Reconciliation of Difference Between Purchase Price and Par Value of Purchase Credit Loans Acquired [Line Items]
Allowance for credit losses at acquisition		$ 18,635	$ 18,635
Carolina Financial [Member]
Disclosure Detail of Reconciliation of Difference Between Purchase Price and Par Value of Purchase Credit Loans Acquired [Line Items]
Purchase price of PCD loans at acquisition	$ 1,053,014
Allowance for credit losses at acquisition	18,635
Non-credit discount at acquisition	10,259
Par value (UPB) of acquired PCD loans at acquisition	$ 1,081,908