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Investment Securities - Summary of Interest Income Earned on Investment Securities (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net Investment Income [Line Items]        
Total interest income from available-for-sale securities $ 9,410 $ 8,449 $ 18,569 $ 18,498
Total interest income from held-to-maturity securities 5,130 3,660 9,070 7,658
Total investment income 14,540 12,109 27,639 26,156
Investment securities available-for-sale [Member]        
Net Investment Income [Line Items]        
Taxable 9,226 8,244 18,194 18,069
Tax-advantaged 184 205 375 429
Total interest income from available-for-sale securities 9,410 8,449 18,569 18,498
Investment securities held-to-maturity [Member]        
Net Investment Income [Line Items]        
Taxable 4,007 2,447 6,818 5,145
Tax-advantaged 1,123 1,213 2,252 2,513
Total interest income from held-to-maturity securities $ 5,130 $ 3,660 $ 9,070 $ 7,658