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Available for Sale Debt Securities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020 USD ($) security	Dec. 31, 2019 USD ($) security	Dec. 31, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items]
Securities available for sale at carrying value	$ 618,000,000.0	$ 536,400,000
Amortized cost	1,073,570,000	965,135,000
Fair value	1,105,489,000	976,919,000
Proceeds from sales of available for sale debt securities	$ 13,905,000	$ 0	$ 2,212,000
Number of securities in an unrealized loss position | security	42	50
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 910,393,000	$ 936,196,000
Fair value	938,413,000	$ 947,430,000
Private Label Mortgage-Backed Securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 17,445
Number of securities in an unrealized loss position | security	1
Unrealized losses	$ (1,300)
Agency Obligations, Collateralized Mortgage Backed Securities And Asset-Backed Securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	963,700,000
Fair value	993,300,000
Available-for-sale Securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	109,881,000
Fair value	112,237,000
Proceeds from sales of available for sale debt securities	$ 13,900,000

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Securities available for sale at carrying value

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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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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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