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Securities Securities - Available for sale (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	$ 5,787,403	$ 4,548,772
Gross Unrealized Gain	16,580	26,982
Gross Unrealized Loss	221,614	258,224
Securities available-for-sale, at fair value	5,582,369	4,317,530
Available-for-sale, Amortized Cost
Due in one year of less	104,404
Due in one year to five years	260,862
Due in five to ten years	408,495
Due after ten years	2,899,412
Mortgage-backed securities	2,068,950
Asset-backed securities	45,280
Amortized Cost	5,787,403	4,548,772
Available-for-sale, Fair Value
Due in one year or less	104,431
Due in one year to five years	241,023
Due in five years to ten years	382,963
Due after ten years	2,846,255
Mortgage-backed securities	1,962,359
Asset-backed securities	45,338
Securities available-for-sale, at fair value	5,582,369	4,317,530
US Treasury Securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	1,419,727	907,990
Gross Unrealized Gain	28	2
Gross Unrealized Loss	14,277	14,580
Securities available-for-sale, at fair value	1,405,478	893,412
Available-for-sale, Amortized Cost
Amortized Cost	1,419,727	907,990
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	1,405,478	893,412
U.S. Government Agency Securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	238,636	284,607
Gross Unrealized Gain	2	0
Gross Unrealized Loss	24,572	21,877
Securities available-for-sale, at fair value	214,066	262,730
Available-for-sale, Amortized Cost
Amortized Cost	238,636	284,607
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	214,066	262,730
Mortgage-backed Agency Securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	2,068,950	1,071,963
Gross Unrealized Gain	976	444
Gross Unrealized Loss	107,567	125,017
Securities available-for-sale, at fair value	1,962,359	947,390
Available-for-sale, Amortized Cost
Amortized Cost	2,068,950	1,071,963
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	1,962,359	947,390
State and Municipal Securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	1,537,910	1,604,874
Gross Unrealized Gain	15,382	26,129
Gross Unrealized Loss	46,735	45,108
Securities available-for-sale, at fair value	1,506,557	1,585,895
Available-for-sale, Amortized Cost
Amortized Cost	1,537,910	1,604,874
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	1,506,557	1,585,895
Asset-backed Securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	45,280	201,577
Gross Unrealized Gain	85	338
Gross Unrealized Loss	27	10,280
Securities available-for-sale, at fair value	45,338	191,635
Available-for-sale, Amortized Cost
Amortized Cost	45,280	201,577
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	45,338	191,635
Corporate Notes
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	476,900	477,761
Gross Unrealized Gain	107	69
Gross Unrealized Loss	28,436	41,362
Securities available-for-sale, at fair value	448,571	436,468
Available-for-sale, Amortized Cost
Amortized Cost	476,900	477,761
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	$ 448,571	$ 436,468

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- Definition

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

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Represents amount of available-for-sale debt securities at cost, net of adjustment of asset-backed securities. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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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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Amount, before tax, of unrealized loss 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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Amortized cost of 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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