Accrued Interest Receivable and Other Assets - Details of Accrued Interest Receivable and Other Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Interest Receivable and Other Assets [Abstract]
Other real estate owned	$ 7,355	$ 516
Accrued interest receivable	16,475	14,100
Accrued income and other receivables	7,340	6,973
Fair market value of derivative financial instruments	2,894	399
Other prepaid expenses	11,470	13,936
Net deferred tax assets	16,514	3,615
Other assets	3,291	680
Total accrued interest and other assets	$ 65,339	$ 40,219