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Securities Securities - Available for sale (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	$ 4,548,772	$ 3,871,491
Gross Unrealized Gain	26,982	12,805
Gross Unrealized Loss	258,224	325,426
Securities available-for-sale, at fair value	4,317,530	3,558,870
Available-for-sale, Amortized Cost
Due in one year of less	16,744
Due in one year to five years	204,619
Due in five to ten years	549,251
Due after ten years	2,504,618
Mortgage-backed securities	1,071,963
Asset-backed securities	201,577
Amortized Cost	4,548,772	3,871,491
Available-for-sale, Fair Value
Due in one year or less	18,747
Due in one year to five years	202,103
Due in five years to ten years	504,648
Due after ten years	2,453,007
Mortgage-backed securities	947,390
Asset-backed securities	191,635
Securities available-for-sale, at fair value	4,317,530	3,558,870
US Treasury Securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	907,990	196,151
Gross Unrealized Gain	2	0
Gross Unrealized Loss	14,580	1,967
Securities available-for-sale, at fair value	893,412	194,184
Available-for-sale, Amortized Cost
Amortized Cost	907,990	196,151
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	893,412	194,184
U.S. Government Agency Securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	284,607	432,475
Gross Unrealized Gain	0	0
Gross Unrealized Loss	21,877	36,318
Securities available-for-sale, at fair value	262,730	396,157
Available-for-sale, Amortized Cost
Amortized Cost	284,607	432,475
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	262,730	396,157
Mortgage-backed Agency Securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	1,071,963	1,114,948
Gross Unrealized Gain	444	211
Gross Unrealized Loss	125,017	143,583
Securities available-for-sale, at fair value	947,390	971,576
Available-for-sale, Amortized Cost
Amortized Cost	1,071,963	1,114,948
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	947,390	971,576
State and Municipal Securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	1,604,874	1,478,310
Gross Unrealized Gain	26,129	12,553
Gross Unrealized Loss	45,108	78,557
Securities available-for-sale, at fair value	1,585,895	1,412,306
Available-for-sale, Amortized Cost
Amortized Cost	1,604,874	1,478,310
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	1,585,895	1,412,306
Asset-backed Securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	201,577	134,386
Gross Unrealized Gain	338	0
Gross Unrealized Loss	10,280	16,983
Securities available-for-sale, at fair value	191,635	117,403
Available-for-sale, Amortized Cost
Amortized Cost	201,577	134,386
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	191,635	117,403
Corporate Notes
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	477,761	515,221
Gross Unrealized Gain	69	41
Gross Unrealized Loss	41,362	48,018
Securities available-for-sale, at fair value	436,468	467,244
Available-for-sale, Amortized Cost
Amortized Cost	477,761	515,221
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	$ 436,468	$ 467,244

X

- 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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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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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), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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