Investment Securities (Securities Available for Sale) (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 955,485	$ 965,135
Gross unrealized gains	34,899	12,932
Gross unrealized losses	(551)	(1,148)
Available for sale debt securities, at fair value	989,833	976,919
Mortgage-Backed Securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	926,561	936,196
Gross unrealized gains	34,130	12,367
Gross unrealized losses	(514)	(1,133)
Available for sale debt securities, at fair value	960,177	947,430
State And Municipal Obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	3,894	3,907
Gross unrealized gains	155	172
Gross unrealized losses	0	0
Available for sale debt securities, at fair value	4,049	4,079
Corporate Obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	25,030	25,032
Gross unrealized gains	614	393
Gross unrealized losses	(37)	(15)
Available for sale debt securities, at fair value	$ 25,607	$ 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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