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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Securities available-for-sale [Abstract]
Amortized Cost	$ 6,659,237	$ 5,787,403
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	10,070	16,580
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	290,619	221,614
Fair Value	6,378,688	5,582,369
Available-for-sale, Amortized Cost [Abstract]
Due in one year or less	214,734
Due in one year to five years	166,792
Due in five years to ten years	342,395
Due after ten years	3,153,944
Mortgage-backed securities	2,781,164
Asset-backed securities	208
Amortized Cost	6,659,237	5,787,403
Available-for-sale, Fair Value [Abstract]
Due in one year or less	214,740
Due in one year to five years	160,915
Due in five years to ten years	327,468
Due after ten years	2,976,649
Mortgage-backed securities	2,698,707
Asset-backed securities	209
Fair Value	6,378,688	5,582,369
Securities held-to-maturity [Abstract]
Amortized Cost	2,689,670	2,800,606
Gross Unrealized Gains	494	2,003
Gross Unrealized Losses	286,285	242,357
Fair Value	2,403,879	2,560,252
Allowance for credit losses - securities held-to-maturity	1,707	1,707
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	2,687,963	2,798,899
Held-to-maturity, Amortized Cost [Abstract]
Due in one year or less	25,030
Due in one year to five years	317,246
Due in five years to ten years	65,473
Due after ten years	1,801,632
Mortgage-backed securities	357,806
Asset-backed securities	122,483
Amortized Cost	2,689,670	2,800,606
Held-to-maturity, Fair Value [Abstract]
Due in one year or less	24,866
Due in one year to five years	305,977
Due in five years to ten years	61,153
Due after ten years	1,559,987
Mortgage-backed securities	333,094
Asset-backed securities	118,802
Fair Value	2,403,879	2,560,252
U.S. Treasury securities
Securities available-for-sale [Abstract]
Amortized Cost	1,565,393	1,419,727
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	7	28
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	30,244	14,277
Fair Value	1,535,156	1,405,478
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	1,565,393	1,419,727
Available-for-sale, Fair Value [Abstract]
Fair Value	1,535,156	1,405,478
Securities held-to-maturity [Abstract]
Amortized Cost	19,888	19,841
Gross Unrealized Gains	0	0
Gross Unrealized Losses	614	954
Fair Value	19,274	18,887
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	19,888	19,841
Held-to-maturity, Fair Value [Abstract]
Fair Value	19,274	18,887
U.S. Government agency securities
Securities available-for-sale [Abstract]
Amortized Cost	221,038	238,636
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	14	2
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	16,867	24,572
Fair Value	204,185	214,066
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	221,038	238,636
Available-for-sale, Fair Value [Abstract]
Fair Value	204,185	214,066
Securities held-to-maturity [Abstract]
Amortized Cost	280,540	315,286
Gross Unrealized Gains	0	0
Gross Unrealized Losses	8,267	13,719
Fair Value	272,273	301,567
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	280,540	315,286
Held-to-maturity, Fair Value [Abstract]
Fair Value	272,273	301,567
Mortgage-backed securities
Securities available-for-sale [Abstract]
Amortized Cost	2,781,164	2,068,950
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	7,056	976
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	89,513	107,567
Fair Value	2,698,707	1,962,359
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	2,781,164	2,068,950
Available-for-sale, Fair Value [Abstract]
Fair Value	2,698,707	1,962,359
Securities held-to-maturity [Abstract]
Amortized Cost	357,806	366,029
Gross Unrealized Gains	332	6
Gross Unrealized Losses	25,044	34,573
Fair Value	333,094	331,462
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	357,806	366,029
Held-to-maturity, Fair Value [Abstract]
Fair Value	333,094	331,462
State and municipal securities
Securities available-for-sale [Abstract]
Amortized Cost	1,765,551	1,537,910
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	1,236	15,382
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	141,528	46,735
Fair Value	1,625,259	1,506,557
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	1,765,551	1,537,910
Available-for-sale, Fair Value [Abstract]
Fair Value	1,625,259	1,506,557
Securities held-to-maturity [Abstract]
Amortized Cost	1,838,985	1,854,942
Gross Unrealized Gains	137	1,956
Gross Unrealized Losses	243,642	178,744
Fair Value	1,595,480	1,678,154
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	1,838,985	1,854,942
Held-to-maturity, Fair Value [Abstract]
Fair Value	1,595,480	1,678,154
Asset-backed securities
Securities available-for-sale [Abstract]
Amortized Cost	208	45,280
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	1	85
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	0	27
Fair Value	209	45,338
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	208	45,280
Available-for-sale, Fair Value [Abstract]
Fair Value	209	45,338
Securities held-to-maturity [Abstract]
Amortized Cost	122,483	161,957
Gross Unrealized Gains	25	41
Gross Unrealized Losses	3,706	6,920
Fair Value	118,802	155,078
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	122,483	161,957
Held-to-maturity, Fair Value [Abstract]
Fair Value	118,802	155,078
Corporate notes and other
Securities available-for-sale [Abstract]
Amortized Cost	325,883	476,900
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	1,756	107
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	12,467	28,436
Fair Value	315,172	448,571
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	325,883	476,900
Available-for-sale, Fair Value [Abstract]
Fair Value	315,172	448,571
Securities held-to-maturity [Abstract]
Amortized Cost	69,968	82,551
Gross Unrealized Gains	0	0
Gross Unrealized Losses	5,012	7,447
Fair Value	64,956	75,104
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	69,968	82,551
Held-to-maturity, Fair Value [Abstract]
Fair Value	$ 64,956	$ 75,104

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Represents amount of available-for-sale debt securities at fair value of asset-backed securities.

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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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