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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Securities available-for-sale [Abstract]
Amortized Cost	$ 3,925,395	$ 4,858,544
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	4,566	88,336
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	387,360	32,686
Fair Value	3,542,601	4,914,194
Available-for-sale, Amortized Cost [Abstract]
Due in one year or less	15,616
Due in one year to five years	187,720
Due in five years to ten years	349,217
Due after ten years	1,689,710
Mortgage-backed securities	1,518,231
Asset-backed securities	164,901
Amortized Cost	3,925,395	4,858,544
Available-for-sale, Fair Value [Abstract]
Due in one year or less	15,574
Due in one year to five years	189,083
Due in five years to ten years	321,759
Due after ten years	1,538,016
Mortgage-backed securities	1,329,528
Asset-backed securities	148,641
Fair Value	3,542,601	4,914,194
Securities held-to-maturity [Abstract]
Amortized Cost	2,940,024	1,156,119
Gross Unrealized Gains	26	33,052
Gross Unrealized Losses	419,080	1,122
Fair Value	2,520,970	1,188,049
Allowance for credit losses - securities held-to-maturity	(1,607)	(161)
HeldToMaturitySecurities, net of allowance for credit losses	2,938,417	1,155,958
Held-to-maturity, Amortized Cost [Abstract]
Due in one year or less	1,986
Due in one year to five years	377,940
Due in five years to ten years	84,549
Due after ten years	1,850,943
Mortgage-backed securities	451,854
Asset-backed securities	172,752
Amortized Cost	2,940,024	1,156,119
Held-to-maturity, Fair Value [Abstract]
Due in one year or less	1,965
Due in one year to five years	348,130
Due in five years to ten years	78,621
Due after ten years	1,533,853
Mortgage-backed securities	402,212
Asset-backed securities	156,189
Fair Value	2,520,970	1,188,049
U.S. Treasury securities
Securities available-for-sale [Abstract]
Amortized Cost	210,655	194,490
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	4,655	881
Fair Value	206,000	193,609
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	210,655	194,490
Available-for-sale, Fair Value [Abstract]
Fair Value	206,000	193,609
Securities held-to-maturity [Abstract]
Amortized Cost	92,837
Gross Unrealized Gains	0
Gross Unrealized Losses	6,897
Fair Value	85,940
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	92,837
Held-to-maturity, Fair Value [Abstract]
Fair Value	85,940
U.S. Government agency securities
Securities available-for-sale [Abstract]
Amortized Cost	443,579	634,611
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	0	2,359
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	36,641	4,961
Fair Value	406,938	632,009
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	443,579	634,611
Available-for-sale, Fair Value [Abstract]
Fair Value	406,938	632,009
Securities held-to-maturity [Abstract]
Amortized Cost	354,118	11,920
Gross Unrealized Gains	0	0
Gross Unrealized Losses	28,181	37
Fair Value	325,937	11,883
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	354,118	11,920
Held-to-maturity, Fair Value [Abstract]
Fair Value	325,937	11,883
Mortgage-backed securities
Securities available-for-sale [Abstract]
Amortized Cost	1,518,231	1,908,675
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	231	29,874
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	188,934	18,310
Fair Value	1,329,528	1,920,239
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	1,518,231	1,908,675
Available-for-sale, Fair Value [Abstract]
Fair Value	1,329,528	1,920,239
Securities held-to-maturity [Abstract]
Amortized Cost	451,854	106,555
Gross Unrealized Gains	0	86
Gross Unrealized Losses	49,642	196
Fair Value	402,212	106,445
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	451,854	106,555
Held-to-maturity, Fair Value [Abstract]
Fair Value	402,212	106,445
State and municipal securities
Securities available-for-sale [Abstract]
Amortized Cost	1,478,698	1,774,119
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	4,270	52,961
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	133,384	3,243
Fair Value	1,349,584	1,823,837
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	1,478,698	1,774,119
Available-for-sale, Fair Value [Abstract]
Fair Value	1,349,584	1,823,837
Securities held-to-maturity [Abstract]
Amortized Cost	1,854,612	1,037,644
Gross Unrealized Gains	26	32,966
Gross Unrealized Losses	316,607	889
Fair Value	1,538,031	1,069,721
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	1,854,612	1,037,644
Held-to-maturity, Fair Value [Abstract]
Fair Value	1,538,031	1,069,721
Asset-backed securities
Securities available-for-sale [Abstract]
Amortized Cost	164,901	232,294
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	0	60
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	16,260	2,785
Fair Value	148,641	229,569
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	164,901	232,294
Available-for-sale, Fair Value [Abstract]
Fair Value	148,641	229,569
Securities held-to-maturity [Abstract]
Amortized Cost	172,752
Gross Unrealized Gains	0
Gross Unrealized Losses	16,563
Fair Value	156,189
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	172,752
Held-to-maturity, Fair Value [Abstract]
Fair Value	156,189
Corporate notes and other
Securities available-for-sale [Abstract]
Amortized Cost	109,331	114,355
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	65	3,082
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	7,486	2,506
Fair Value	101,910	114,931
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	109,331	114,355
Available-for-sale, Fair Value [Abstract]
Fair Value	101,910	$ 114,931
Securities held-to-maturity [Abstract]
Amortized Cost	13,851
Gross Unrealized Gains	0
Gross Unrealized Losses	1,190
Fair Value	12,661
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	13,851
Held-to-maturity, Fair Value [Abstract]
Fair Value	$ 12,661

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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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