Quarterly report pursuant to Section 13 or 15(d)

Securities - Additional Information (Detail)

v3.20.2
Securities - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Investments Debt And Equity Securities [Abstract]        
Gain (loss) in earnings resulting from sale of securities $ 0 $ 0 $ 15,712,000 $ 1,295,000
Proceeds from sales of securities     495,566,000 113,306,000
Net unrealized gain (losses) recorded in comprehensive income     15,300,000 586,000
Available for sale securities pledged as collateral $ 35,000,000.0 $ 30,200,000 $ 35,000,000.0 $ 30,200,000