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Investment Securities (Available for Sale by Contractual Maturity) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 1,067,874	$ 965,135
Fair value	1,100,391	$ 976,919
Available-for-sale Securities
Debt Securities, Available-for-sale [Line Items]
Due in one year or less, amortized cost	0
Due after one year through five years, amortized cost	5,679
Due after five years through ten years, amortized cost	38,089
Due after ten years, amortized cost	66,379
Amortized cost	110,147
Due in one year or less, fair value	0
Due after one year through five years, fair value	5,792
Due after five years through ten years, fair value	38,737
Due after ten years, fair value	66,739
Fair value	$ 111,268

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