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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, 2025	Dec. 31, 2024
Available-for-Sale:
Available-for-Sale: Amortized Cost	$ 3,460,563	$ 2,947,415
Available-for-Sale: Gross Unrealized Gains	7,969	1,248
Available-for-Sale: Gross Unrealized Losses	(188,122)	(259,135)
Total Investment Securities Available-for-Sale	3,280,410	2,689,528
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	4,340,032	4,618,543
Held-to-Maturity: Gross Unrealized Gains	332	40
Held-to-Maturity: Gross Unrealized Losses	(622,791)	(797,701)
Investment Securities Held-to-Maturity	3,717,573	3,820,882
Debt Securities Issued by the U.S. Treasury and Government Agencies
Available-for-Sale:
Available-for-Sale: Amortized Cost	245,946	257,036
Available-for-Sale: Gross Unrealized Gains	176	221
Available-for-Sale: Gross Unrealized Losses	(4,281)	(8,185)
Total Investment Securities Available-for-Sale	241,841	249,072
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	129,463	131,868
Held-to-Maturity: Gross Unrealized Gains	0	0
Held-to-Maturity: Gross Unrealized Losses	(9,696)	(14,927)
Investment Securities Held-to-Maturity	119,767	116,941
Debt Securities Issued by States and Political Subdivisions
Available-for-Sale:
Available-for-Sale: Amortized Cost	72,434	73,208
Available-for-Sale: Gross Unrealized Gains	0	0
Available-for-Sale: Gross Unrealized Losses	(6,393)	(9,349)
Total Investment Securities Available-for-Sale	66,041	63,859
Debt Securities Issued by U.S. Government-Sponsored Enterprises
Available-for-Sale:
Available-for-Sale: Amortized Cost	1,004	1,505
Available-for-Sale: Gross Unrealized Gains	0	0
Available-for-Sale: Gross Unrealized Losses	(13)	(41)
Total Investment Securities Available-for-Sale	991	1,464
Debt Securities Issued by Corporations
Available-for-Sale:
Available-for-Sale: Amortized Cost	752,393	703,579
Available-for-Sale: Gross Unrealized Gains	2,011	376
Available-for-Sale: Gross Unrealized Losses	(21,477)	(32,280)
Total Investment Securities Available-for-Sale	732,927	671,675
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	10,286	10,490
Held-to-Maturity: Gross Unrealized Gains	0	0
Held-to-Maturity: Gross Unrealized Losses	(1,738)	(2,156)
Investment Securities Held-to-Maturity	8,548	8,334
Total Collateralized Mortgage Obligations
Available-for-Sale:
Available-for-Sale: Amortized Cost	1,707,390	1,356,995
Available-for-Sale: Gross Unrealized Gains	2,816	521
Available-for-Sale: Gross Unrealized Losses	(108,831)	(138,822)
Total Investment Securities Available-for-Sale	1,601,375	1,218,694
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	2,451,264	2,601,599
Held-to-Maturity: Gross Unrealized Gains	4	3
Held-to-Maturity: Gross Unrealized Losses	(371,914)	(469,360)
Investment Securities Held-to-Maturity	2,079,354	2,132,242
Residential - Government Agencies or Sponsored Enterprises
Available-for-Sale:
Available-for-Sale: Amortized Cost	1,295,644	1,050,299
Available-for-Sale: Gross Unrealized Gains	2,190	322
Available-for-Sale: Gross Unrealized Losses	(87,243)	(115,401)
Total Investment Securities Available-for-Sale	1,210,591	935,220
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	2,041,489	2,185,210
Held-to-Maturity: Gross Unrealized Gains	4	3
Held-to-Maturity: Gross Unrealized Losses	(291,372)	(377,149)
Investment Securities Held-to-Maturity	1,750,121	1,808,064
Commercial - Government Agencies or Sponsored Enterprises
Available-for-Sale:
Available-for-Sale: Amortized Cost	351,102	306,696
Available-for-Sale: Gross Unrealized Gains	544	199
Available-for-Sale: Gross Unrealized Losses	(21,461)	(23,421)
Total Investment Securities Available-for-Sale	330,185	283,474
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	409,775	416,389
Held-to-Maturity: Gross Unrealized Gains	0	0
Held-to-Maturity: Gross Unrealized Losses	(80,542)	(92,211)
Investment Securities Held-to-Maturity	329,233	324,178
Commercial - Non-Agency
Available-for-Sale:
Available-for-Sale: Amortized Cost	60,644
Available-for-Sale: Gross Unrealized Gains	82
Available-for-Sale: Gross Unrealized Losses	(127)
Total Investment Securities Available-for-Sale	60,599
Total Mortgage-Backed Securities
Available-for-Sale:
Available-for-Sale: Amortized Cost	681,396	555,092
Available-for-Sale: Gross Unrealized Gains	2,966	130
Available-for-Sale: Gross Unrealized Losses	(47,127)	(70,458)
Total Investment Securities Available-for-Sale	637,235	484,764
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	1,749,019	1,874,586
Held-to-Maturity: Gross Unrealized Gains	328	37
Held-to-Maturity: Gross Unrealized Losses	(239,443)	(311,258)
Investment Securities Held-to-Maturity	1,509,904	1,563,365
Residential - Government Agencies or Sponsored Agencies
Available-for-Sale:
Available-for-Sale: Amortized Cost	681,396	555,092
Available-for-Sale: Gross Unrealized Gains	2,966	130
Available-for-Sale: Gross Unrealized Losses	(47,127)	(70,458)
Total Investment Securities Available-for-Sale	637,235	484,764
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	1,739,033	1,864,591
Held-to-Maturity: Gross Unrealized Gains	328	37
Held-to-Maturity: Gross Unrealized Losses	(237,717)	(309,093)
Investment Securities Held-to-Maturity	1,501,644	1,555,535
Commercial - Government Agencies or Sponsored Enterprises
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	9,986	9,995
Held-to-Maturity: Gross Unrealized Gains	0	0
Held-to-Maturity: Gross Unrealized Losses	(1,726)	(2,165)
Investment Securities Held-to-Maturity	$ 8,260	$ 7,830

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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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