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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Net Investment Income [Line Items]        
Total interest income from available-for-sale securities $ 8,447 $ 9,222 $ 26,945 $ 29,985
Total interest income from held-to-maturity securities 3,375 4,298 11,033 13,249
Total investment income 11,822 13,520 37,978 43,234
Investment securities available-for-sale [Member]        
Net Investment Income [Line Items]        
Taxable 8,244 8,949 26,313 29,079
Tax-advantaged 203 273 632 906
Total interest income from available-for-sale securities 8,447 9,222 26,945 29,985
Investment securities held-to-maturity [Member]        
Net Investment Income [Line Items]        
Taxable 2,265 2,883 7,410 8,725
Tax-advantaged 1,110 1,415 3,623 4,524
Total interest income from held-to-maturity securities $ 3,375 $ 4,298 $ 11,033 $ 13,249