Loans Receivable - Acquisition Amount of MSB Purchased Loans (Detail) $ in Thousands	Jul. 10, 2020 USD ($)
Receivables [Abstract]
Purchase price of PCD loans at acquisition	$ 65,347
Allowance for credit losses at acquisition	3,901
Non-credit discount at acquisition	167
Amortized cost of acquired PCD loans at acquisition	$ 69,415