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Securities Securities - Available for sale (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	$ 3,871,491	$ 4,858,544
Gross Unrealized Gain	12,805	88,336
Gross Unrealized Loss	325,426	32,686
Securities available-for-sale, at fair value	3,558,870	4,914,194
Available-for-sale, Amortized Cost
Due in one year of less	12,329
Due in one year to five years	186,874
Due in five to ten years	725,776
Due after ten years	1,697,178
Mortgage-backed securities	1,114,948
Asset-backed securities	134,386
Amortized Cost	3,871,491	4,858,544
Available-for-sale, Fair Value
Due in one year or less	12,234
Due in one year to five years	193,512
Due in five years to ten years	654,799
Due after ten years	1,609,346
Mortgage-backed securities	971,576
Asset-backed securities	117,403
Securities available-for-sale, at fair value	3,558,870	4,914,194
US Treasury Securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	196,151	194,490
Gross Unrealized Gain	0	0
Gross Unrealized Loss	1,967	881
Securities available-for-sale, at fair value	194,184	193,609
Available-for-sale, Amortized Cost
Amortized Cost	196,151	194,490
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	194,184	193,609
U.S. Government Agency Securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	432,475	634,611
Gross Unrealized Gain	0	2,359
Gross Unrealized Loss	36,318	4,961
Securities available-for-sale, at fair value	396,157	632,009
Available-for-sale, Amortized Cost
Amortized Cost	432,475	634,611
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	396,157	632,009
Mortgage-backed Agency Securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	1,114,948	1,908,675
Gross Unrealized Gain	211	29,874
Gross Unrealized Loss	143,583	18,310
Securities available-for-sale, at fair value	971,576	1,920,239
Available-for-sale, Amortized Cost
Amortized Cost	1,114,948	1,908,675
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	971,576	1,920,239
State and Municipal Securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	1,478,310	1,774,119
Gross Unrealized Gain	12,553	52,961
Gross Unrealized Loss	78,557	3,243
Securities available-for-sale, at fair value	1,412,306	1,823,837
Available-for-sale, Amortized Cost
Amortized Cost	1,478,310	1,774,119
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	1,412,306	1,823,837
Asset-backed Securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	134,386	232,294
Gross Unrealized Gain	0	60
Gross Unrealized Loss	16,983	2,785
Securities available-for-sale, at fair value	117,403	229,569
Available-for-sale, Amortized Cost
Amortized Cost	134,386	232,294
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	117,403	229,569
Corporate Notes
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	515,221	114,355
Gross Unrealized Gain	41	3,082
Gross Unrealized Loss	48,018	2,506
Securities available-for-sale, at fair value	467,244	114,931
Available-for-sale, Amortized Cost
Amortized Cost	515,221	114,355
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	$ 467,244	$ 114,931

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- Definition

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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