Quarterly report pursuant to Section 13 or 15(d)

Securities - Realized Gains and Losses on Sales of Investment Securities (Detail)

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Securities - Realized Gains and Losses on Sales of Investment Securities (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]        
Gross realized gains on sales of securities     $ 15,712,000 $ 1,359,000
Gross realized losses on sales of securities       (64,000)
Net realized gains on sales of securities $ 0 $ 0 15,712,000 1,295,000
Proceeds from sales of securities     $ 495,566,000 $ 113,306,000