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Available for Sale Debt Securities - Securities Available for Sale by Contractual Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Securities available for sale, amortized cost	$ 1,073,570	$ 965,135
Securities available for sale, at fair value	1,105,489	$ 976,919
Available-for-sale Securities
Debt Securities, Available-for-sale [Line Items]
Due after one year through five years, amortized cost	5,676
Due after five years through ten years, amortized cost	38,046
Due after ten years, amortized cost	66,159
Securities available for sale, amortized cost	109,881
Due after one year through five years, fair value	5,791
Due after five years through ten years, fair value	38,780
Due after ten years, fair value	67,666
Securities available for sale, at fair value	$ 112,237

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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