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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Securities available-for-sale [Abstract]
Amortized Cost	$ 5,096,189	$ 4,548,772
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	26,574	26,982
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	213,796	258,224
Fair Value	4,908,967	4,317,530
Available-for-sale, Amortized Cost [Abstract]
Due in one year or less	67,851
Due in one year to five years	233,513
Due in five years to ten years	438,075
Due after ten years	2,727,579
Mortgage-backed securities	1,500,690
Asset-backed securities	128,481
Amortized Cost	5,096,189	4,548,772
Available-for-sale, Fair Value [Abstract]
Due in one year or less	68,485
Due in one year to five years	224,280
Due in five years to ten years	411,348
Due after ten years	2,686,586
Mortgage-backed securities	1,390,181
Asset-backed securities	128,087
Fair Value	4,908,967	4,317,530
Securities held-to-maturity [Abstract]
Amortized Cost	2,975,631	3,008,064
Gross Unrealized Gains	2,550	6,716
Gross Unrealized Losses	258,545	239,596
Fair Value	2,719,636	2,775,184
Allowance for credit losses - securities held-to-maturity	1,707	1,707
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	2,973,924	3,006,357
Held-to-maturity, Amortized Cost [Abstract]
Due in one year or less	121,289
Due in one year to five years	370,914
Due in five years to ten years	66,668
Due after ten years	1,852,172
Mortgage-backed securities	373,826
Asset-backed securities	190,762
Amortized Cost	2,975,631	3,008,064
Held-to-maturity, Fair Value [Abstract]
Due in one year or less	119,182
Due in one year to five years	347,132
Due in five years to ten years	60,431
Due after ten years	1,677,490
Mortgage-backed securities	336,162
Asset-backed securities	179,239
Fair Value	2,719,636	2,775,184
U.S. Treasury securities
Securities available-for-sale [Abstract]
Amortized Cost	1,399,084	907,990
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	1	2
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	6,877	14,580
Fair Value	1,392,208	893,412
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	1,399,084	907,990
Available-for-sale, Fair Value [Abstract]
Fair Value	1,392,208	893,412
Securities held-to-maturity [Abstract]
Amortized Cost	90,089	90,309
Gross Unrealized Gains	0	0
Gross Unrealized Losses	2,649	3,840
Fair Value	87,440	86,469
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	90,089	90,309
Held-to-maturity, Fair Value [Abstract]
Fair Value	87,440	86,469
U.S. Government agency securities
Securities available-for-sale [Abstract]
Amortized Cost	262,915	284,607
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	20	0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	23,880	21,877
Fair Value	239,055	262,730
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	262,915	284,607
Available-for-sale, Fair Value [Abstract]
Fair Value	239,055	262,730
Securities held-to-maturity [Abstract]
Amortized Cost	365,028	364,769
Gross Unrealized Gains	0	0
Gross Unrealized Losses	19,093	19,187
Fair Value	345,935	345,582
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	365,028	364,769
Held-to-maturity, Fair Value [Abstract]
Fair Value	345,935	345,582
Mortgage-backed securities
Securities available-for-sale [Abstract]
Amortized Cost	1,500,690	1,071,963
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	1,308	444
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	111,817	125,017
Fair Value	1,390,181	947,390
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	1,500,690	1,071,963
Available-for-sale, Fair Value [Abstract]
Fair Value	1,390,181	947,390
Securities held-to-maturity [Abstract]
Amortized Cost	373,826	382,100
Gross Unrealized Gains	113	637
Gross Unrealized Losses	37,777	34,900
Fair Value	336,162	347,837
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	373,826	382,100
Held-to-maturity, Fair Value [Abstract]
Fair Value	336,162	347,837
State and municipal securities
Securities available-for-sale [Abstract]
Amortized Cost	1,325,113	1,604,874
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	24,795	26,129
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	38,108	45,108
Fair Value	1,311,800	1,585,895
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	1,325,113	1,604,874
Available-for-sale, Fair Value [Abstract]
Fair Value	1,311,800	1,585,895
Securities held-to-maturity [Abstract]
Amortized Cost	1,871,366	1,886,459
Gross Unrealized Gains	2,430	6,079
Gross Unrealized Losses	178,688	159,027
Fair Value	1,695,108	1,733,511
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	1,871,366	1,886,459
Held-to-maturity, Fair Value [Abstract]
Fair Value	1,695,108	1,733,511
Asset-backed securities
Securities available-for-sale [Abstract]
Amortized Cost	128,481	201,577
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	304	338
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	698	10,280
Fair Value	128,087	191,635
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	128,481	201,577
Available-for-sale, Fair Value [Abstract]
Fair Value	128,087	191,635
Securities held-to-maturity [Abstract]
Amortized Cost	190,762	198,418
Gross Unrealized Gains	7	0
Gross Unrealized Losses	11,530	14,228
Fair Value	179,239	184,190
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	190,762	198,418
Held-to-maturity, Fair Value [Abstract]
Fair Value	179,239	184,190
Corporate notes and other
Securities available-for-sale [Abstract]
Amortized Cost	479,906	477,761
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	146	69
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	32,416	41,362
Fair Value	447,636	436,468
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	479,906	477,761
Available-for-sale, Fair Value [Abstract]
Fair Value	447,636	436,468
Securities held-to-maturity [Abstract]
Amortized Cost	84,560	86,009
Gross Unrealized Gains	0	0
Gross Unrealized Losses	8,808	8,414
Fair Value	75,752	77,595
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	84,560	86,009
Held-to-maturity, Fair Value [Abstract]
Fair Value	$ 75,752	$ 77,595

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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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