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Investment Securities - Schedule of Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Available-for-Sale:
Available-for-Sale: Amortized Cost	$ 2,694,012	$ 3,172,436
Available-for-Sale: Gross Unrealized Gains	704	1,851
Available-for-Sale: Gross Unrealized Losses	(285,783)	(329,464)
Available-for-Sale: Fair Value	2,408,933	2,844,823
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	4,997,335	5,414,139
Held-to-Maturity: Gross Unrealized Gains	29	43
Held-to-Maturity: Gross Unrealized Losses	(743,727)	(798,789)
Held-to-Maturity: Fair Value	4,253,637	4,615,393
Debt Securities Issued by the U.S. Treasury and Government Agencies
Available-for-Sale:
Available-for-Sale: Amortized Cost	223,308	248,335
Available-for-Sale: Gross Unrealized Gains	361	638
Available-for-Sale: Gross Unrealized Losses	(11,096)	(15,067)
Available-for-Sale: Fair Value	212,573	233,906
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	131,742	131,619
Held-to-Maturity: Gross Unrealized Losses	(15,211)	(18,202)
Held-to-Maturity: Fair Value	116,531	113,417
Debt Securities Issued by States and Political Subdivisions
Available-for-Sale:
Available-for-Sale: Amortized Cost	73,417	107,689
Available-for-Sale: Gross Unrealized Gains		158
Available-for-Sale: Gross Unrealized Losses	(9,611)	(12,582)
Available-for-Sale: Fair Value	63,806	95,265
Debt Securities Issued by Government-Sponsored Enterprises
Available-for-Sale:
Available-for-Sale: Amortized Cost	1,556	48,807
Available-for-Sale: Gross Unrealized Losses	(80)	(179)
Available-for-Sale: Fair Value	1,476	48,628
Debt Securities Issued by Corporations
Available-for-Sale:
Available-for-Sale: Amortized Cost	706,002	850,585
Available-for-Sale: Gross Unrealized Gains	142	809
Available-for-Sale: Gross Unrealized Losses	(48,443)	(56,736)
Available-for-Sale: Fair Value	657,701	794,658
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	11,483	17,014
Held-to-Maturity: Gross Unrealized Losses	(1,998)	(2,534)
Held-to-Maturity: Fair Value	9,485	14,480
Residential - Government Agencies
Available-for-Sale:
Available-for-Sale: Amortized Cost	713,918	828,798
Available-for-Sale: Gross Unrealized Gains	194	245
Available-for-Sale: Gross Unrealized Losses	(84,785)	(96,215)
Available-for-Sale: Fair Value	629,327	732,828
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	1,674,076	1,848,239
Held-to-Maturity: Gross Unrealized Gains	20	35
Held-to-Maturity: Gross Unrealized Losses	(265,493)	(294,047)
Held-to-Maturity: Fair Value	1,408,603	1,554,227
Residential - U.S. Government-Sponsored Enterprises
Available-for-Sale:
Available-for-Sale: Amortized Cost	818,296	919,980
Available-for-Sale: Gross Unrealized Gains	7	1
Available-for-Sale: Gross Unrealized Losses	(109,176)	(126,110)
Available-for-Sale: Fair Value	709,127	793,871
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	2,744,094	2,968,322
Held-to-Maturity: Gross Unrealized Gains	9	8
Held-to-Maturity: Gross Unrealized Losses	(369,965)	(397,055)
Held-to-Maturity: Fair Value	2,374,138	2,571,275
Commercial - Government Agencies - Sponsored Agencies
Available-for-Sale:
Available-for-Sale: Amortized Cost	157,515	168,242
Available-for-Sale: Gross Unrealized Losses	(22,592)	(22,575)
Available-for-Sale: Fair Value	134,923	145,667
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	435,940	448,945
Held-to-Maturity: Gross Unrealized Losses	(91,060)	(86,951)
Held-to-Maturity: Fair Value	344,880	361,994
Mortgage-Backed Securities
Available-for-Sale:
Available-for-Sale: Amortized Cost	1,689,729	1,917,020
Available-for-Sale: Gross Unrealized Gains	201	246
Available-for-Sale: Gross Unrealized Losses	(216,553)	(244,900)
Available-for-Sale: Fair Value	1,473,377	1,672,366
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	4,854,110	5,265,506
Held-to-Maturity: Gross Unrealized Gains	29	43
Held-to-Maturity: Gross Unrealized Losses	(726,518)	(778,053)
Held-to-Maturity: Fair Value	$ 4,127,621	$ 4,487,496

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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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