Investment Securities (Securities Available for Sale) (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 1,197,401	$ 1,073,570
Gross unrealized gains	26,959	32,890
Gross unrealized losses	(7,424)	(971)
Available for sale debt securities, at fair value	1,216,936	1,105,489
Agency Obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost		1,001
Gross unrealized gains		8
Gross unrealized losses		0
Available for sale debt securities, at fair value		1,009
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,042,480	910,393
Gross unrealized gains	23,915	28,872
Gross unrealized losses	(6,243)	(852)
Available for sale debt securities, at fair value	1,060,152	938,413
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	47,329	52,295
Gross unrealized gains	1,876	1,535
Gross unrealized losses	0	0
Available for sale debt securities, at fair value	49,205	53,830
State And Municipal Obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	69,443	69,687
Gross unrealized gains	429	1,666
Gross unrealized losses	(938)	(95)
Available for sale debt securities, at fair value	68,934	71,258
Corporate Obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	38,149	40,194
Gross unrealized gains	739	809
Gross unrealized losses	(243)	(24)
Available for sale debt securities, at fair value	$ 38,645	$ 40,979

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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