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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	Mar. 31, 2024	Dec. 31, 2023
Available-for-Sale:
Available-for-Sale: Amortized Cost	$ 2,642,728	$ 2,694,012
Available-for-Sale: Gross Unrealized Gains	635	704
Available-for-Sale: Gross Unrealized Losses	(291,312)	(285,783)
Available-for-Sale: Fair Value	2,352,051	2,408,933
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	4,913,457	4,997,335
Held-to-Maturity: Gross Unrealized Gains	25	29
Held-to-Maturity: Gross Unrealized Losses	(808,860)	(743,727)
Held-to-Maturity: Fair Value	4,104,622	4,253,637
Debt Securities Issued by the U.S. Treasury and Government Agencies
Available-for-Sale:
Available-for-Sale: Amortized Cost	217,711	223,308
Available-for-Sale: Gross Unrealized Gains	267	361
Available-for-Sale: Gross Unrealized Losses	(11,666)	(11,096)
Available-for-Sale: Fair Value	206,312	212,573
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	131,773	131,742
Held-to-Maturity: Gross Unrealized Losses	(16,655)	(15,211)
Held-to-Maturity: Fair Value	115,118	116,531
Debt Securities Issued by States and Political Subdivisions
Available-for-Sale:
Available-for-Sale: Amortized Cost	73,337	73,417
Available-for-Sale: Gross Unrealized Losses	(9,886)	(9,611)
Available-for-Sale: Fair Value	63,451	63,806
Debt Securities Issued by Government-Sponsored Enterprises
Available-for-Sale:
Available-for-Sale: Amortized Cost	1,506	1,556
Available-for-Sale: Gross Unrealized Losses	(81)	(80)
Available-for-Sale: Fair Value	1,425	1,476
Debt Securities Issued by Corporations
Available-for-Sale:
Available-for-Sale: Amortized Cost	705,308	706,002
Available-for-Sale: Gross Unrealized Gains	244	142
Available-for-Sale: Gross Unrealized Losses	(44,406)	(48,443)
Available-for-Sale: Fair Value	661,146	657,701
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	11,176	11,483
Held-to-Maturity: Gross Unrealized Losses	(2,126)	(1,998)
Held-to-Maturity: Fair Value	9,050	9,485
Residential - Government Agencies
Available-for-Sale:
Available-for-Sale: Amortized Cost	691,565	713,918
Available-for-Sale: Gross Unrealized Gains	119	194
Available-for-Sale: Gross Unrealized Losses	(89,408)	(84,785)
Available-for-Sale: Fair Value	602,276	629,327
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	1,639,458	1,674,076
Held-to-Maturity: Gross Unrealized Gains	15	20
Held-to-Maturity: Gross Unrealized Losses	(283,447)	(265,493)
Held-to-Maturity: Fair Value	1,356,026	1,408,603
Residential - U.S. Government-Sponsored Enterprises
Available-for-Sale:
Available-for-Sale: Amortized Cost	797,610	818,296
Available-for-Sale: Gross Unrealized Gains	5	7
Available-for-Sale: Gross Unrealized Losses	(113,042)	(109,176)
Available-for-Sale: Fair Value	684,573	709,127
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	2,697,411	2,744,094
Held-to-Maturity: Gross Unrealized Gains	10	9
Held-to-Maturity: Gross Unrealized Losses	(412,329)	(369,965)
Held-to-Maturity: Fair Value	2,285,092	2,374,138
Commercial - Government Agencies or Sponsored Agencies
Available-for-Sale:
Available-for-Sale: Amortized Cost	155,691	157,515
Available-for-Sale: Gross Unrealized Losses	(22,823)	(22,592)
Available-for-Sale: Fair Value	132,868	134,923
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	433,639	435,940
Held-to-Maturity: Gross Unrealized Losses	(94,303)	(91,060)
Held-to-Maturity: Fair Value	339,336	344,880
Mortgage-Backed Securities
Available-for-Sale:
Available-for-Sale: Amortized Cost	1,644,866	1,689,729
Available-for-Sale: Gross Unrealized Gains	124	201
Available-for-Sale: Gross Unrealized Losses	(225,273)	(216,553)
Available-for-Sale: Fair Value	1,419,717	1,473,377
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	4,770,508	4,854,110
Held-to-Maturity: Gross Unrealized Gains	25	29
Held-to-Maturity: Gross Unrealized Losses	(790,079)	(726,518)
Held-to-Maturity: Fair Value	$ 3,980,454	$ 4,127,621

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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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