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Securities Securities - Available for sale (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	$ 4,858,544	$ 3,487,296
Gross Unrealized Gain	88,336	117,222
Gross Unrealized Loss	32,686	17,837
Securities available-for-sale, at fair value	4,914,194	3,586,681
Available-for-sale, Amortized Cost
Due in one year of less	103,578
Due in one year to five years	320,844
Due in five to ten years	507,968
Due after ten years	1,785,185
Mortgage-backed securities	1,908,675
Asset-backed securities	232,294
Amortized Cost	4,858,544	3,487,296
Available-for-sale, Fair Value
Due in one year or less	103,533
Due in one year to five years	321,710
Due in five years to ten years	513,643
Due after ten years	1,825,500
Mortgage-backed securities	1,920,239
Asset-backed securities	229,569
Securities available-for-sale, at fair value	4,914,194	3,586,681
US Treasury Securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	194,490	82,199
Gross Unrealized Gain	0	10
Gross Unrealized Loss	881	0
Securities available-for-sale, at fair value	193,609	82,209
Available-for-sale, Amortized Cost
Amortized Cost	194,490	82,199
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	193,609	82,209
U.S. Government Agency Securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	634,611	74,916
Gross Unrealized Gain	2,359	1,547
Gross Unrealized Loss	4,961	60
Securities available-for-sale, at fair value	632,009	76,403
Available-for-sale, Amortized Cost
Amortized Cost	634,611	74,916
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	632,009	76,403
Mortgage-backed Agency Securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	1,908,675	1,623,759
Gross Unrealized Gain	29,874	67,759
Gross Unrealized Loss	18,310	2,327
Securities available-for-sale, at fair value	1,920,239	1,689,191
Available-for-sale, Amortized Cost
Amortized Cost	1,908,675	1,623,759
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	1,920,239	1,689,191
State and Municipal Securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	1,774,119	1,411,288
Gross Unrealized Gain	52,961	44,559
Gross Unrealized Loss	3,243	12,484
Securities available-for-sale, at fair value	1,823,837	1,443,363
Available-for-sale, Amortized Cost
Amortized Cost	1,774,119	1,411,288
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	1,823,837	1,443,363
Asset-backed Securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	232,294	177,878
Gross Unrealized Gain	60	715
Gross Unrealized Loss	2,785	657
Securities available-for-sale, at fair value	229,569	177,936
Available-for-sale, Amortized Cost
Amortized Cost	232,294	177,878
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	229,569	177,936
Corporate Notes
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	114,355	117,256
Gross Unrealized Gain	3,082	2,632
Gross Unrealized Loss	2,506	2,309
Securities available-for-sale, at fair value	114,931	117,579
Available-for-sale, Amortized Cost
Amortized Cost	114,355	117,256
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	$ 114,931	$ 117,579

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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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