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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Net Investment Income [Line Items]        
Total interest income from available-for-sale securities $ 9,222 $ 11,521 $ 29,985 $ 35,086
Total interest income from held-to-maturity securities 4,298 4,666 13,249 14,238
Total investment income 13,520 16,187 43,234 49,324
Investment securities available-for-sale [Member]        
Net Investment Income [Line Items]        
Taxable 8,949 11,126 29,079 33,861
Tax-advantaged 273 395 906 1,225
Total interest income from available-for-sale securities 9,222 11,521 29,985 35,086
Investment securities held-to-maturity [Member]        
Net Investment Income [Line Items]        
Taxable 2,883 2,961 8,725 8,887
Tax-advantaged 1,415 1,705 4,524 5,351
Total interest income from held-to-maturity securities $ 4,298 $ 4,666 $ 13,249 $ 14,238