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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Securities available-for-sale [Abstract]
Amortized Cost	$ 6,161,600	$ 5,787,403
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	11,038	16,580
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	222,461	221,614
Fair Value	5,950,177	5,582,369
Available-for-sale, Amortized Cost [Abstract]
Due in one year or less	103,606
Due in one year to five years	146,988
Due in five years to ten years	380,758
Due after ten years	3,031,522
Mortgage-backed securities	2,498,506
Asset-backed securities	220
Amortized Cost	6,161,600	5,787,403
Available-for-sale, Fair Value [Abstract]
Due in one year or less	103,613
Due in one year to five years	139,827
Due in five years to ten years	363,820
Due after ten years	2,929,970
Mortgage-backed securities	2,412,725
Asset-backed securities	222
Fair Value	5,950,177	5,582,369
Securities held-to-maturity [Abstract]
Amortized Cost	2,770,324	2,800,606
Gross Unrealized Gains	862	2,003
Gross Unrealized Losses	266,273	242,357
Fair Value	2,504,913	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	2,768,617	2,798,899
Held-to-maturity, Amortized Cost [Abstract]
Due in one year or less	60,635
Due in one year to five years	297,494
Due in five years to ten years	80,126
Due after ten years	1,814,485
Mortgage-backed securities	362,343
Asset-backed securities	155,241
Amortized Cost	2,770,324	2,800,606
Held-to-maturity, Fair Value [Abstract]
Due in one year or less	60,198
Due in one year to five years	284,548
Due in five years to ten years	74,737
Due after ten years	1,601,514
Mortgage-backed securities	334,133
Asset-backed securities	149,783
Fair Value	2,504,913	2,560,252
U.S. Treasury securities
Securities available-for-sale [Abstract]
Amortized Cost	1,460,687	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	8,394	14,277
Fair Value	1,452,300	1,405,478
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	1,460,687	1,419,727
Available-for-sale, Fair Value [Abstract]
Fair Value	1,452,300	1,405,478
Securities held-to-maturity [Abstract]
Amortized Cost	19,864	19,841
Gross Unrealized Gains	0	0
Gross Unrealized Losses	746	954
Fair Value	19,118	18,887
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	19,864	19,841
Held-to-maturity, Fair Value [Abstract]
Fair Value	19,118	18,887
U.S. Government agency securities
Securities available-for-sale [Abstract]
Amortized Cost	223,183	238,636
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	10	2
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	18,586	24,572
Fair Value	204,607	214,066
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	223,183	238,636
Available-for-sale, Fair Value [Abstract]
Fair Value	204,607	214,066
Securities held-to-maturity [Abstract]
Amortized Cost	305,413	315,286
Gross Unrealized Gains	0	0
Gross Unrealized Losses	10,037	13,719
Fair Value	295,376	301,567
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	305,413	315,286
Held-to-maturity, Fair Value [Abstract]
Fair Value	295,376	301,567
Mortgage-backed securities
Securities available-for-sale [Abstract]
Amortized Cost	2,498,506	2,068,950
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	7,318	976
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	93,099	107,567
Fair Value	2,412,725	1,962,359
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	2,498,506	2,068,950
Available-for-sale, Fair Value [Abstract]
Fair Value	2,412,725	1,962,359
Securities held-to-maturity [Abstract]
Amortized Cost	362,343	366,029
Gross Unrealized Gains	249	6
Gross Unrealized Losses	28,459	34,573
Fair Value	334,133	331,462
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	362,343	366,029
Held-to-maturity, Fair Value [Abstract]
Fair Value	334,133	331,462
State and municipal securities
Securities available-for-sale [Abstract]
Amortized Cost	1,634,080	1,537,910
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	2,534	15,382
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	88,712	46,735
Fair Value	1,547,902	1,506,557
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	1,634,080	1,537,910
Available-for-sale, Fair Value [Abstract]
Fair Value	1,547,902	1,506,557
Securities held-to-maturity [Abstract]
Amortized Cost	1,847,378	1,854,942
Gross Unrealized Gains	584	1,956
Gross Unrealized Losses	215,613	178,744
Fair Value	1,632,349	1,678,154
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	1,847,378	1,854,942
Held-to-maturity, Fair Value [Abstract]
Fair Value	1,632,349	1,678,154
Asset-backed securities
Securities available-for-sale [Abstract]
Amortized Cost	220	45,280
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	2	85
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	0	27
Fair Value	222	45,338
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	220	45,280
Available-for-sale, Fair Value [Abstract]
Fair Value	222	45,338
Securities held-to-maturity [Abstract]
Amortized Cost	155,241	161,957
Gross Unrealized Gains	29	41
Gross Unrealized Losses	5,487	6,920
Fair Value	149,783	155,078
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	155,241	161,957
Held-to-maturity, Fair Value [Abstract]
Fair Value	149,783	155,078
Corporate notes and other
Securities available-for-sale [Abstract]
Amortized Cost	344,924	476,900
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	1,167	107
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	13,670	28,436
Fair Value	332,421	448,571
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	344,924	476,900
Available-for-sale, Fair Value [Abstract]
Fair Value	332,421	448,571
Securities held-to-maturity [Abstract]
Amortized Cost	80,085	82,551
Gross Unrealized Gains	0	0
Gross Unrealized Losses	5,931	7,447
Fair Value	74,154	75,104
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	80,085	82,551
Held-to-maturity, Fair Value [Abstract]
Fair Value	$ 74,154	$ 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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