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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	Jun. 30, 2023	Dec. 31, 2022
Available-for-Sale:
Available-for-Sale: Amortized Cost	$ 2,993,004	$ 3,172,436
Available-for-Sale: Gross Unrealized Gains	1,340	1,851
Available-for-Sale: Gross Unrealized Losses	(327,621)	(329,464)
Available-for-Sale: Fair Value	2,666,723	2,844,823
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	5,202,698	5,414,139
Held-to-Maturity: Gross Unrealized Gains	18	43
Held-to-Maturity: Gross Unrealized Losses	(791,713)	(798,789)
Held-to-Maturity: Fair Value	4,411,003	4,615,393
Debt Securities Issued by the U.S. Treasury and Government Agencies
Available-for-Sale:
Available-for-Sale: Amortized Cost	235,178	248,335
Available-for-Sale: Gross Unrealized Gains	472	638
Available-for-Sale: Gross Unrealized Losses	(14,569)	(15,067)
Available-for-Sale: Fair Value	221,081	233,906
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	131,678	131,619
Held-to-Maturity: Gross Unrealized Losses	(17,666)	(18,202)
Held-to-Maturity: Fair Value	114,012	113,417
Debt Securities Issued by States and Political Subdivisions
Available-for-Sale:
Available-for-Sale: Amortized Cost	107,621	107,689
Available-for-Sale: Gross Unrealized Gains	142	158
Available-for-Sale: Gross Unrealized Losses	(11,223)	(12,582)
Available-for-Sale: Fair Value	96,540	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	(120)	(179)
Available-for-Sale: Fair Value	1,637	48,628
Debt Securities Issued by Corporations
Available-for-Sale:
Available-for-Sale: Amortized Cost	844,587	850,585
Available-for-Sale: Gross Unrealized Gains	552	809
Available-for-Sale: Gross Unrealized Losses	(56,385)	(56,736)
Available-for-Sale: Fair Value	788,754	794,658
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	12,094	17,014
Held-to-Maturity: Gross Unrealized Losses	(2,174)	(2,534)
Held-to-Maturity: Fair Value	9,920	14,480
Residential - Government Agencies
Available-for-Sale:
Available-for-Sale: Amortized Cost	771,006	828,798
Available-for-Sale: Gross Unrealized Gains	174	245
Available-for-Sale: Gross Unrealized Losses	(95,976)	(96,215)
Available-for-Sale: Fair Value	675,204	732,828
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	1,761,490	1,848,239
Held-to-Maturity: Gross Unrealized Gains	11	35
Held-to-Maturity: Gross Unrealized Losses	(290,874)	(294,047)
Held-to-Maturity: Fair Value	1,470,627	1,554,227
Residential - U.S. Government-Sponsored Enterprises
Available-for-Sale:
Available-for-Sale: Amortized Cost	869,381	919,980
Available-for-Sale: Gross Unrealized Gains		1
Available-for-Sale: Gross Unrealized Losses	(124,667)	(126,110)
Available-for-Sale: Fair Value	744,714	793,871
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	2,856,709	2,968,322
Held-to-Maturity: Gross Unrealized Gains	7	8
Held-to-Maturity: Gross Unrealized Losses	(387,659)	(397,055)
Held-to-Maturity: Fair Value	2,469,057	2,571,275
Commercial - Government Agencies or Sponsored Agencies
Available-for-Sale:
Available-for-Sale: Amortized Cost	163,474	168,242
Available-for-Sale: Gross Unrealized Losses	(24,681)	(22,575)
Available-for-Sale: Fair Value	138,793	145,667
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	440,727	448,945
Held-to-Maturity: Gross Unrealized Losses	(93,340)	(86,951)
Held-to-Maturity: Fair Value	347,387	361,994
Mortgage-Backed Securities
Available-for-Sale:
Available-for-Sale: Amortized Cost	1,803,861	1,917,020
Available-for-Sale: Gross Unrealized Gains	174	246
Available-for-Sale: Gross Unrealized Losses	(245,324)	(244,900)
Available-for-Sale: Fair Value	1,558,711	1,672,366
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	5,058,926	5,265,506
Held-to-Maturity: Gross Unrealized Gains	18	43
Held-to-Maturity: Gross Unrealized Losses	(771,873)	(778,053)
Held-to-Maturity: Fair Value	$ 4,287,071	$ 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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