Available for Sale Debt Securities - Disclosure on Securities Available for Sale with Temporary Impairment (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	$ 132,875	$ 138,283
Less than 12 months, gross unrealized losses	(919)	(644)
12 months or longer, fair value	10,007	46,819
12 months or longer, gross unrealized losses	(52)	(504)
Total, fair value	142,882	185,102
Total, gross unrealized losses	(971)	(1,148)
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	127,600	136,270
Less than 12 months, gross unrealized losses	(824)	(629)
12 months or longer, fair value	8,007	46,819
12 months or longer, gross unrealized losses	(28)	(504)
Total, fair value	135,607	183,089
Total, gross unrealized losses	(852)	(1,133)
State and municipal obligations
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	5,275
Less than 12 months, gross unrealized losses	(95)
12 months or longer, fair value	0
12 months or longer, gross unrealized losses	0
Total, fair value	5,275
Total, gross unrealized losses	(95)
Corporate obligations
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	0	2,013
Less than 12 months, gross unrealized losses	0	(15)
12 months or longer, fair value	2,000	0
12 months or longer, gross unrealized losses	(24)	0
Total, fair value	2,000	2,013
Total, gross unrealized losses	$ (24)	$ (15)

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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