Accrued Interest Receivable and Other Assets - Details of Accrued Interest Receivable and Other Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Interest Receivable and Other Assets [Abstract]
Other real estate owned	$ 516	$ 1,187
Accrued interest receivable	14,100	14,255
Accrued income and other receivables	6,973	3,933
Fair market value of derivative financial instruments	399	679
Other prepaid expenses	13,936	14,652
Net federal deferred tax assets	3,615	3,585
Other assets	680	322
Total accrued interest and other assets	$ 40,219	$ 38,613