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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Securities available-for-sale [Abstract]
Amortized Cost	$ 6,599,728	$ 5,787,403
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	18,638	16,580
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	206,560	221,614
Fair Value	6,411,806	5,582,369
Available-for-sale, Amortized Cost [Abstract]
Due in one year or less	254,717
Due in one year to five years	153,534
Due in five years to ten years	343,759
Due after ten years	3,163,467
Mortgage-backed securities	2,684,056
Asset-backed securities	195
Amortized Cost	6,599,728	5,787,403
Available-for-sale, Fair Value [Abstract]
Due in one year or less	254,763
Due in one year to five years	148,861
Due in five years to ten years	329,620
Due after ten years	3,060,177
Mortgage-backed securities	2,618,190
Asset-backed securities	195
Fair Value	6,411,806	5,582,369
Securities held-to-maturity [Abstract]
Amortized Cost	2,646,509	2,800,606
Gross Unrealized Gains	1,330	2,003
Gross Unrealized Losses	215,771	242,357
Fair Value	2,432,068	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	2,644,802	2,798,899
Held-to-maturity, Amortized Cost [Abstract]
Due in one year or less	19,912
Due in one year to five years	301,156
Due in five years to ten years	69,337
Due after ten years	1,782,718
Mortgage-backed securities	352,571
Asset-backed securities	120,815
Amortized Cost	2,646,509	2,800,606
Held-to-maturity, Fair Value [Abstract]
Due in one year or less	19,464
Due in one year to five years	292,411
Due in five years to ten years	64,814
Due after ten years	1,604,758
Mortgage-backed securities	332,646
Asset-backed securities	117,975
Fair Value	2,432,068	2,560,252
U.S. Treasury securities
Securities available-for-sale [Abstract]
Amortized Cost	1,606,437	1,419,727
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	46	28
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	12,925	14,277
Fair Value	1,593,558	1,405,478
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	1,606,437	1,419,727
Available-for-sale, Fair Value [Abstract]
Fair Value	1,593,558	1,405,478
Securities held-to-maturity [Abstract]
Amortized Cost	19,912	19,841
Gross Unrealized Gains	0	0
Gross Unrealized Losses	448	954
Fair Value	19,464	18,887
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	19,912	19,841
Held-to-maturity, Fair Value [Abstract]
Fair Value	19,464	18,887
U.S. Government agency securities
Securities available-for-sale [Abstract]
Amortized Cost	219,925	238,636
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	18	2
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	16,127	24,572
Fair Value	203,816	214,066
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	219,925	238,636
Available-for-sale, Fair Value [Abstract]
Fair Value	203,816	214,066
Securities held-to-maturity [Abstract]
Amortized Cost	255,676	315,286
Gross Unrealized Gains	0	0
Gross Unrealized Losses	6,440	13,719
Fair Value	249,236	301,567
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	255,676	315,286
Held-to-maturity, Fair Value [Abstract]
Fair Value	249,236	301,567
Mortgage-backed securities
Securities available-for-sale [Abstract]
Amortized Cost	2,684,056	2,068,950
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	12,604	976
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	78,470	107,567
Fair Value	2,618,190	1,962,359
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	2,684,056	2,068,950
Available-for-sale, Fair Value [Abstract]
Fair Value	2,618,190	1,962,359
Securities held-to-maturity [Abstract]
Amortized Cost	352,571	366,029
Gross Unrealized Gains	530	6
Gross Unrealized Losses	20,455	34,573
Fair Value	332,646	331,462
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	352,571	366,029
Held-to-maturity, Fair Value [Abstract]
Fair Value	332,646	331,462
State and municipal securities
Securities available-for-sale [Abstract]
Amortized Cost	1,774,299	1,537,910
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	3,994	15,382
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	87,755	46,735
Fair Value	1,690,538	1,506,557
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	1,774,299	1,537,910
Available-for-sale, Fair Value [Abstract]
Fair Value	1,690,538	1,506,557
Securities held-to-maturity [Abstract]
Amortized Cost	1,828,121	1,854,942
Gross Unrealized Gains	778	1,956
Gross Unrealized Losses	181,161	178,744
Fair Value	1,647,738	1,678,154
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	1,828,121	1,854,942
Held-to-maturity, Fair Value [Abstract]
Fair Value	1,647,738	1,678,154
Asset-backed securities
Securities available-for-sale [Abstract]
Amortized Cost	195	45,280
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	0	85
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	0	27
Fair Value	195	45,338
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	195	45,280
Available-for-sale, Fair Value [Abstract]
Fair Value	195	45,338
Securities held-to-maturity [Abstract]
Amortized Cost	120,815	161,957
Gross Unrealized Gains	22	41
Gross Unrealized Losses	2,862	6,920
Fair Value	117,975	155,078
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	120,815	161,957
Held-to-maturity, Fair Value [Abstract]
Fair Value	117,975	155,078
Corporate notes and other
Securities available-for-sale [Abstract]
Amortized Cost	314,816	476,900
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	1,976	107
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	11,283	28,436
Fair Value	305,509	448,571
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	314,816	476,900
Available-for-sale, Fair Value [Abstract]
Fair Value	305,509	448,571
Securities held-to-maturity [Abstract]
Amortized Cost	69,414	82,551
Gross Unrealized Gains	0	0
Gross Unrealized Losses	4,405	7,447
Fair Value	65,009	75,104
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	69,414	82,551
Held-to-maturity, Fair Value [Abstract]
Fair Value	$ 65,009	$ 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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