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Investment Securities - Summary of Interest Income Earned on Investment Securities (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Net Investment Income [Line Items]        
Total interest income from available-for-sale securities $ 9,813 $ 8,447 $ 28,382 $ 26,945
Total interest income from held-to-maturity securities 5,188 3,375 14,258 11,033
Total investment income 15,001 11,822 42,640 37,978
Investment securities available-for-sale [Member]        
Net Investment Income [Line Items]        
Taxable 9,630 8,244 27,824 26,313
Tax-advantaged 183 203 558 632
Total interest income from available-for-sale securities 9,813 8,447 28,382 26,945
Investment securities held-to-maturity [Member]        
Net Investment Income [Line Items]        
Taxable 4,099 2,265 10,917 7,410
Tax-advantaged 1,089 1,110 3,341 3,623
Total interest income from held-to-maturity securities $ 5,188 $ 3,375 $ 14,258 $ 11,033