Investment Securities (Schedule of Securities Available for Sale) (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 3,043,178	$ 2,975,695
Gross unrealized gains	16,149	11,606
Gross unrealized losses	(180,542)	(218,386)
Available for sale debt securities, at fair value	2,878,785	2,768,915
U.S. Treasury obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	330,547	348,621
Gross unrealized gains	339	317
Gross unrealized losses	(14,574)	(18,340)
Available for sale debt securities, at fair value	316,312	330,598
Government-agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	48,309	105,965
Gross unrealized gains	1,187	1,461
Gross unrealized losses	(167)	(191)
Available for sale debt securities, at fair value	49,329	107,235
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,399,880	2,243,725
Gross unrealized gains	8,690	4,982
Gross unrealized losses	(152,732)	(186,548)
Available for sale debt securities, at fair value	2,255,838	2,062,159
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	45,974	47,203
Gross unrealized gains	619	645
Gross unrealized losses	(207)	(285)
Available for sale debt securities, at fair value	46,386	47,563
State and municipal obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	125,239	126,766
Gross unrealized gains	437	243
Gross unrealized losses	(10,279)	(10,092)
Available for sale debt securities, at fair value	115,397	116,917
Corporate obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	93,229	103,415
Gross unrealized gains	4,877	3,958
Gross unrealized losses	(2,583)	(2,930)
Available for sale debt securities, at fair value	$ 95,523	$ 104,443

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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