Investment Securities (Securities Available for Sale) (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 915,518	$ 965,135
Gross unrealized gains	33,454	12,932
Gross unrealized losses	(358)	(1,148)
Available for sale debt securities, at fair value	948,614	976,919
Mortgage-Backed Securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	884,608	936,196
Gross unrealized gains	32,709	12,367
Gross unrealized losses	(332)	(1,133)
Available for sale debt securities, at fair value	916,985	947,430
State And Municipal Obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	3,882	3,907
Gross unrealized gains	214	172
Gross unrealized losses	0	0
Available for sale debt securities, at fair value	4,096	4,079
Corporate Obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	27,028	25,032
Gross unrealized gains	531	393
Gross unrealized losses	(26)	(15)
Available for sale debt securities, at fair value	$ 27,533	$ 25,410

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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