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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Investments Debt And Equity Securities [Abstract]        
Gross realized gains on sales of securities $ 15,712,000 $ 634,000 $ 15,712,000 $ 1,359,000
Gross realized losses on sales of securities   (64,000)   (64,000)
Net realized gains on sales of securities 15,712,000 570,000 15,712,000 1,295,000
Proceeds from sales of securities $ 495,566,000 $ 44,119,000 $ 495,566,000 $ 113,306,000