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Investment Securities (Contractual Maturities of Investment Securities) (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Available-for-sale securities
Due in one year or less, amortized cost	$ 48,130	$ 49,714	$ 100,140
Due in one to five years, amortized cost	67,138	72,382	76,104
Due in five to ten years, amortized cost	110,960	118,358	110,125
Due after ten years, amortized cost	69,329	69,200	93,055
Amortized Cost	3,193,741	2,316,369	2,395,927
Due in one year or less, fair value	47,945	49,822	100,361
Due in one to five years, fair value	66,034	73,850	78,291
Due in five to ten years, fair value	105,670	117,573	110,928
Due after ten years, fair value	68,416	72,560	97,596
Fair Value	2,998,898	2,327,793	2,430,749
Held-to-maturity securities
Held-to-maturity securities, due in one year or less, amortized cost	1,208	2,976	6,812
Held-to-maturity securities, due in one to five years, amortized cost	83,085	79,422	50,318
Held-to-maturity securities, due in five to ten years, amortized cost	101,410	106,713	184,677
Held-to-maturity securities, due after ten years, amortized cost	303,290	222,522	187,596
Amortized Cost	3,435,888	2,942,363	2,166,518
Less: Allowance for credit losses	(159)	(78)	(99)
Held-to-maturity securities, net of allowance for credit losses	3,435,729	2,942,285	2,166,419
Held-to-maturity securities, due in one year or less, fair value	1,213	2,992	6,863
Held-to-maturity securities, due in one to five years, fair value	80,210	79,705	50,734
Held-to-maturity securities, due in five to ten years, fair value	102,940	112,667	191,539
Held-to-maturity securities, due after ten years, fair value	275,270	221,358	183,663
Fair Value	3,146,427	2,900,694	2,121,065
Mortgage-backed
Available-for-sale securities
Mortgage-backed, without single maturity date, amortized cost	2,898,184	2,006,715	2,016,503
Mortgage-backed, without single maturity date, fair value	2,710,833	2,013,988	2,043,573
Held-to-maturity securities
Mortgage-backed, amortized cost	2,946,895	2,530,730	1,737,115
Mortgage-backed, fair value	$ 2,686,794	$ 2,483,972	$ 1,688,266

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