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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	Sep. 30, 2023	Dec. 31, 2022
Available-for-Sale:
Available-for-Sale: Amortized Cost	$ 2,752,093	$ 3,172,436
Available-for-Sale: Gross Unrealized Gains	516	1,851
Available-for-Sale: Gross Unrealized Losses	(365,285)	(329,464)
Available-for-Sale: Fair Value	2,387,324	2,844,823
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	5,088,013	5,414,139
Held-to-Maturity: Gross Unrealized Gains	5	43
Held-to-Maturity: Gross Unrealized Losses	(983,549)	(798,789)
Held-to-Maturity: Fair Value	4,104,469	4,615,393
Debt Securities Issued by the U.S. Treasury and Government Agencies
Available-for-Sale:
Available-for-Sale: Amortized Cost	228,181	248,335
Available-for-Sale: Gross Unrealized Gains	408	638
Available-for-Sale: Gross Unrealized Losses	(15,133)	(15,067)
Available-for-Sale: Fair Value	213,456	233,906
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	131,710	131,619
Held-to-Maturity: Gross Unrealized Losses	(20,301)	(18,202)
Held-to-Maturity: Fair Value	111,409	113,417
Debt Securities Issued by States and Political Subdivisions
Available-for-Sale:
Available-for-Sale: Amortized Cost	73,722	107,689
Available-for-Sale: Gross Unrealized Gains		158
Available-for-Sale: Gross Unrealized Losses	(13,120)	(12,582)
Available-for-Sale: Fair Value	60,602	95,265
Debt Securities Issued by Government-Sponsored Enterprises
Available-for-Sale:
Available-for-Sale: Amortized Cost	1,757	48,807
Available-for-Sale: Gross Unrealized Losses	(117)	(179)
Available-for-Sale: Fair Value	1,640	48,628
Debt Securities Issued by Corporations
Available-for-Sale:
Available-for-Sale: Amortized Cost	706,693	850,585
Available-for-Sale: Gross Unrealized Gains	7	809
Available-for-Sale: Gross Unrealized Losses	(57,560)	(56,736)
Available-for-Sale: Fair Value	649,140	794,658
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	11,788	17,014
Held-to-Maturity: Gross Unrealized Losses	(2,582)	(2,534)
Held-to-Maturity: Fair Value	9,206	14,480
Residential - Government Agencies
Available-for-Sale:
Available-for-Sale: Amortized Cost	740,652	828,798
Available-for-Sale: Gross Unrealized Gains	101	245
Available-for-Sale: Gross Unrealized Losses	(108,806)	(96,215)
Available-for-Sale: Fair Value	631,947	732,828
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	1,712,317	1,848,239
Held-to-Maturity: Gross Unrealized Gains		35
Held-to-Maturity: Gross Unrealized Losses	(330,120)	(294,047)
Held-to-Maturity: Fair Value	1,382,197	1,554,227
Residential - U.S. Government-Sponsored Enterprises
Available-for-Sale:
Available-for-Sale: Amortized Cost	841,441	919,980
Available-for-Sale: Gross Unrealized Gains		1
Available-for-Sale: Gross Unrealized Losses	(142,092)	(126,110)
Available-for-Sale: Fair Value	699,349	793,871
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	2,794,307	2,968,322
Held-to-Maturity: Gross Unrealized Gains	5	8
Held-to-Maturity: Gross Unrealized Losses	(519,138)	(397,055)
Held-to-Maturity: Fair Value	2,275,174	2,571,275
Commercial - Government Agencies or Sponsored Agencies
Available-for-Sale:
Available-for-Sale: Amortized Cost	159,647	168,242
Available-for-Sale: Gross Unrealized Losses	(28,457)	(22,575)
Available-for-Sale: Fair Value	131,190	145,667
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	437,891	448,945
Held-to-Maturity: Gross Unrealized Losses	(111,408)	(86,951)
Held-to-Maturity: Fair Value	326,483	361,994
Mortgage-Backed Securities
Available-for-Sale:
Available-for-Sale: Amortized Cost	1,741,740	1,917,020
Available-for-Sale: Gross Unrealized Gains	101	246
Available-for-Sale: Gross Unrealized Losses	(279,355)	(244,900)
Available-for-Sale: Fair Value	1,462,486	1,672,366
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	4,944,515	5,265,506
Held-to-Maturity: Gross Unrealized Gains	5	43
Held-to-Maturity: Gross Unrealized Losses	(960,666)	(778,053)
Held-to-Maturity: Fair Value	$ 3,983,854	$ 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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