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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, 2024	Dec. 31, 2023
Available-for-Sale:
Available-for-Sale: Amortized Cost	$ 2,947,415	$ 2,694,012
Available-for-Sale: Gross Unrealized Gains	1,248	704
Available-for-Sale: Gross Unrealized Losses	(259,135)	(285,783)
Available-for-Sale: Fair Value	2,689,528	2,408,933
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	4,618,543	4,997,335
Held-to-Maturity: Gross Unrealized Gains	40	29
Held-to-Maturity: Gross Unrealized Losses	(797,701)	(743,727)
Held-to-Maturity: Fair Value	3,820,882	4,253,637
Debt Securities Issued by the U.S. Treasury and Government Agencies
Available-for-Sale:
Available-for-Sale: Amortized Cost	257,036	223,308
Available-for-Sale: Gross Unrealized Gains	221	361
Available-for-Sale: Gross Unrealized Losses	(8,185)	(11,096)
Available-for-Sale: Fair Value	249,072	212,573
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	131,868	131,742
Held-to-Maturity: Gross Unrealized Losses	(14,927)	(15,211)
Held-to-Maturity: Fair Value	116,941	116,531
Debt Securities Issued by States and Political Subdivisions
Available-for-Sale:
Available-for-Sale: Amortized Cost	73,208	73,417
Available-for-Sale: Gross Unrealized Gains		0
Available-for-Sale: Gross Unrealized Losses	(9,349)	(9,611)
Available-for-Sale: Fair Value	63,859	63,806
Debt Securities Issued by Government-Sponsored Enterprises
Available-for-Sale:
Available-for-Sale: Amortized Cost	1,505	1,556
Available-for-Sale: Gross Unrealized Losses	(41)	(80)
Available-for-Sale: Fair Value	1,464	1,476
Debt Securities Issued by Corporations
Available-for-Sale:
Available-for-Sale: Amortized Cost	703,579	706,002
Available-for-Sale: Gross Unrealized Gains	376	142
Available-for-Sale: Gross Unrealized Losses	(32,280)	(48,443)
Available-for-Sale: Fair Value	671,675	657,701
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	10,490	11,483
Held-to-Maturity: Gross Unrealized Losses	(2,156)	(1,998)
Held-to-Maturity: Fair Value	8,334	9,485
Residential - Government Agencies or Sponsored Enterprises
Available-for-Sale:
Available-for-Sale: Amortized Cost	1,050,299	892,513
Available-for-Sale: Gross Unrealized Gains	322	1
Available-for-Sale: Gross Unrealized Losses	(115,401)	(118,151)
Available-for-Sale: Fair Value	935,220	774,363
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	2,185,210	2,383,375
Held-to-Maturity: Gross Unrealized Gains	3	3
Held-to-Maturity: Gross Unrealized Losses	(377,149)	(361,295)
Held-to-Maturity: Fair Value	1,808,064	2,022,083
Commercial - Government Agencies or Sponsored Enterprises
Available-for-Sale:
Available-for-Sale: Amortized Cost	306,696	157,515
Available-for-Sale: Gross Unrealized Gains	199
Available-for-Sale: Gross Unrealized Losses	(23,421)	(22,592)
Available-for-Sale: Fair Value	283,474	134,923
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	416,389	425,935
Held-to-Maturity: Gross Unrealized Losses	(92,211)	(88,932)
Held-to-Maturity: Fair Value	324,178	337,003
Collateralized Mortgage Obligations
Available-for-Sale:
Available-for-Sale: Amortized Cost	1,356,995	1,050,028
Available-for-Sale: Gross Unrealized Gains	521	1
Available-for-Sale: Gross Unrealized Losses	(138,822)	(140,743)
Available-for-Sale: Fair Value	1,218,694	909,286
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	2,601,599	2,809,310
Held-to-Maturity: Gross Unrealized Gains	3	3
Held-to-Maturity: Gross Unrealized Losses	(469,360)	(450,227)
Held-to-Maturity: Fair Value	2,132,242	2,359,086
Residential - Government Agencies or Sponsored Enterprises
Available-for-Sale:
Available-for-Sale: Amortized Cost	555,092	639,701
Available-for-Sale: Gross Unrealized Gains	130	200
Available-for-Sale: Gross Unrealized Losses	(70,458)	(75,810)
Available-for-Sale: Fair Value	484,764	564,091
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	1,864,591	2,034,794
Held-to-Maturity: Gross Unrealized Gains	37	26
Held-to-Maturity: Gross Unrealized Losses	(309,093)	(274,162)
Held-to-Maturity: Fair Value	1,555,535	1,760,658
Commercial - Government Agencies or Sponsored Enterprises
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	9,995	10,006
Held-to-Maturity: Gross Unrealized Losses	(2,165)	(2,129)
Held-to-Maturity: Fair Value	7,830	7,877
Mortgage-Backed Securities
Available-for-Sale:
Available-for-Sale: Amortized Cost	555,092	639,701
Available-for-Sale: Gross Unrealized Gains	130	200
Available-for-Sale: Gross Unrealized Losses	(70,458)	(75,810)
Available-for-Sale: Fair Value	484,764	564,091
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	1,874,586	2,044,800
Held-to-Maturity: Gross Unrealized Gains	37	26
Held-to-Maturity: Gross Unrealized Losses	(311,258)	(276,291)
Held-to-Maturity: Fair Value	$ 1,563,365	$ 1,768,535

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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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