Investment Securities (Securities Available for Sale) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 1,067,874	$ 965,135
Gross unrealized gains	33,795	12,932
Gross unrealized losses	(1,278)	(1,148)
Available for sale debt securities, at fair value	1,100,391	976,919
Mortgage-Backed Securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	903,628	936,196
Gross unrealized gains	31,407	12,367
Gross unrealized losses	(864)	(1,133)
Available for sale debt securities, at fair value	934,171	947,430
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	53,018
Gross unrealized gains	877
Gross unrealized losses	(27)
Available for sale debt securities, at fair value	53,868
State And Municipal Obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	69,931	3,907
Gross unrealized gains	918	172
Gross unrealized losses	(331)	0
Available for sale debt securities, at fair value	70,518	4,079
Corporate Obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	40,216	25,032
Gross unrealized gains	589	393
Gross unrealized losses	(55)	(15)
Available for sale debt securities, at fair value	40,750	$ 25,410
Investments
Debt Securities, Available-for-sale [Line Items]
Amortized cost	957,700
Available for sale debt securities, at fair value	$ 989,100

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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