Available for Sale Debt Securities - Securities Available for Sale (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Securities available for sale, amortized cost	$ 965,135	$ 1,076,282
Gross unrealized gains	12,932	3,056
Gross unrealized losses	(1,148)	(16,259)
Fair value	976,919	1,063,079
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Securities available for sale, amortized cost	936,196	1,048,415
Gross unrealized gains	12,367	2,704
Gross unrealized losses	(1,133)	(16,150)
Fair value	947,430	1,034,969
State and municipal obligations
Debt Securities, Available-for-sale [Line Items]
Securities available for sale, amortized cost	3,907	2,828
Gross unrealized gains	172	84
Gross unrealized losses	0	0
Fair value	4,079	2,912
Corporate obligations
Debt Securities, Available-for-sale [Line Items]
Securities available for sale, amortized cost	25,032	25,039
Gross unrealized gains	393	268
Gross unrealized losses	(15)	(109)
Fair value	$ 25,410	$ 25,198

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on 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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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount 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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