Quarterly report pursuant to Section 13 or 15(d)

Securities - Additional Information (Detail)

v3.20.2
Securities - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Investments Debt And Equity Securities [Abstract]        
Net gain (loss) in earnings resulting from sale of securities $ 15,712,000 $ 570,000 $ 15,712,000 $ 1,295,000
Net unrealized gain (losses) recorded in comprehensive income 15,300,000 792,000 15,300,000 586,000
Available for sale securities pledged as collateral $ 50,000,000.0 $ 30,200,000 $ 50,000,000.0 $ 30,200,000