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Securities - Gross Unrealized Losses and Fair Value of Investment Securities Held to Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule Of Held To Maturity Securities [Line Items]
Less than 12 months, Fair Value	$ 339,169	$ 132,271
Less than 12 months,Unrealized Losses	(8,130)	(4,591)
12 months or more, Fair Value	197,950	109,712
12 months or more, Unrealized Losses	(24,421)	(10,302)
Total Fair Value	537,119	241,983
Total Unrealized Losses	(32,551)	(14,893)
State and political subdivisions [Member]
Schedule Of Held To Maturity Securities [Line Items]
Less than 12 months, Fair Value	339,169	132,271
Less than 12 months,Unrealized Losses	(8,130)	(4,591)
12 months or more, Fair Value	197,950	109,712
12 months or more, Unrealized Losses	(24,421)	(10,302)
Total Fair Value	537,119	241,983
Total Unrealized Losses	$ (32,551)	$ (14,893)

X

- Definition

Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for 12 months or longer.

+ References

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position.

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