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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Net Investment Income [Line Items]        
Total interest income from available-for-sale securities $ 8,449 $ 10,118 $ 18,498 $ 20,763
Total interest income from held-to-maturity securities 3,660 4,426 7,658 8,951
Total investment income 12,109 14,544 26,156 29,714
Investment securities available-for-sale [Member]        
Net Investment Income [Line Items]        
Taxable 8,244 9,821 18,069 20,130
Tax-advantaged 205 297 429 633
Total interest income from available-for-sale securities 8,449 10,118 18,498 20,763
Investment securities held-to-maturity [Member]        
Net Investment Income [Line Items]        
Taxable 2,447 2,932 5,145 5,842
Tax-advantaged 1,213 1,494 2,513 3,109
Total interest income from held-to-maturity securities $ 3,660 $ 4,426 $ 7,658 $ 8,951