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Securities - Schedule of Fair Value and Amortized Cost of Available-for-sale and Held-to-maturity Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	$ 3,407,093	$ 2,541,107
Available-for-sale, Gross Unrealized Gains	2,421	384
Available-for-sale, Gross Unrealized Losses	(260,471)	(295,419)
Available-for-sale, Fair Value	3,149,043	2,246,072
Held-to-maturity, Amortized Cost	1,143,376	1,152,906
Held-to-maturity, Gross Unrealized Gains	204	164
Held-to-maturity, Gross Unrealized Losses	(140,784)	(146,253)
Held-to-maturity securities, Fair value	1,002,796	1,006,817
Total debt securities, Amortized Cost	4,550,469	3,694,013
Total debt securities, Gross Unrealized Gains	2,625	548
Total debt securities, Gross Unrealized Losses	(401,255)	(441,672)
Total securities, Fair Value	4,151,839	3,252,889
U.S. Treasury [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	195,423	146,113
Available-for-sale, Gross Unrealized Gains	76	63
Available-for-sale, Gross Unrealized Losses	(45)	(63)
Available-for-sale, Fair Value	195,454	146,113
U.S. Government Sponsored Entities and Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	234,563	224,944
Available-for-sale, Gross Unrealized Gains	38
Available-for-sale, Gross Unrealized Losses	(25,724)	(30,702)
Available-for-sale, Fair Value	208,877	194,242
Held-to-maturity, Amortized Cost	2,923	2,988
Held-to-maturity, Gross Unrealized Losses	(203)	(260)
Held-to-maturity securities, Fair value	2,720	2,728
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	2,599,877	1,850,284
Available-for-sale, Gross Unrealized Gains	2,107	245
Available-for-sale, Gross Unrealized Losses	(227,802)	(257,088)
Available-for-sale, Fair Value	2,374,182	1,593,441
Held-to-maturity, Amortized Cost	31,354	32,803
Held-to-maturity, Gross Unrealized Losses	(2,236)	(2,754)
Held-to-maturity securities, Fair value	29,118	30,049
Commercial Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	165,312	235,873
Available-for-sale, Gross Unrealized Gains	48	51
Available-for-sale, Gross Unrealized Losses	(3,522)	(4,142)
Available-for-sale, Fair Value	161,838	231,782
Asset-Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	70,422
Available-for-sale, Gross Unrealized Gains	46
Available-for-sale, Gross Unrealized Losses	(73)
Available-for-sale, Fair Value	70,395
Obligations of State and Political Subdivisions [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	85,868	71,919
Available-for-sale, Gross Unrealized Gains	36	25
Available-for-sale, Gross Unrealized Losses	(3,202)	(3,324)
Available-for-sale, Fair Value	82,702	68,620
Held-to-maturity, Amortized Cost	1,093,002	1,098,957
Held-to-maturity, Gross Unrealized Gains	176	164
Held-to-maturity, Gross Unrealized Losses	(138,283)	(143,130)
Held-to-maturity securities, Fair value	954,895	955,991
Corporate Debt Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	55,628	11,974
Available-for-sale, Gross Unrealized Gains	70
Available-for-sale, Gross Unrealized Losses	(103)	(100)
Available-for-sale, Fair Value	55,595	11,874
Held-to-maturity, Amortized Cost	16,097	18,158
Held-to-maturity, Gross Unrealized Gains	28
Held-to-maturity, Gross Unrealized Losses	(62)	(109)
Held-to-maturity securities, Fair value	$ 16,063	$ 18,049

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