Investment Securities (Securities Available for Sale) (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 1,091,766	$ 1,076,282
Gross unrealized gains	12,113	3,056
Gross unrealized losses	(1,618)	(16,259)
Available for sale debt securities, at fair value	1,102,261	1,063,079
Mortgage-Backed Securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,062,798	1,048,415
Gross unrealized gains	11,581	2,704
Gross unrealized losses	(1,618)	(16,150)
Available for sale debt securities, at fair value	1,072,761	1,034,969
State And Municipal Obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	3,932	2,828
Gross unrealized gains	171	84
Gross unrealized losses	0	0
Available for sale debt securities, at fair value	4,103	2,912
Corporate Obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	25,036	25,039
Gross unrealized gains	361	268
Gross unrealized losses	0	(109)
Available for sale debt securities, at fair value	$ 25,397	$ 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

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