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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Net Investment Income [Line Items]        
Investment securities available-for-sale $ 21,225 $ 19,356 $ 42,671 $ 38,952
Total interest income from held-to-maturity securities 13,445 13,740 26,847 27,696
Total interest income from investment securities 34,670 33,096 69,518 66,648
Investment securities available-for-sale [Member]        
Net Investment Income [Line Items]        
Taxable 21,057 19,187 42,337 38,615
Tax-advantaged 168 169 334 337
Investment securities available-for-sale 21,225 19,356 42,671 38,952
Investment securities held-to-maturity [Member]        
Net Investment Income [Line Items]        
Taxable 11,050 11,293 22,034 22,800
Tax-advantaged 2,395 2,447 4,813 4,896
Total interest income from held-to-maturity securities $ 13,445 $ 13,740 $ 26,847 $ 27,696