Securities- Unrealized Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 2,347,693	$ 1,800,502
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	208,032	20,878
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	957,377	317,275
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	179,328	11,808
Total investments with an unrealized loss, fair value	3,305,070	2,117,777
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	387,360	32,686
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	196,001	178,610
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	4,653	881
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	9,998	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	2	0
Total investments with an unrealized loss, fair value	205,999	178,610
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	4,655	881
U.S. Government agency securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	267,400	353,951
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	17,991	2,987
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	139,538	54,266
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	18,650	1,974
Total investments with an unrealized loss, fair value	406,938	408,217
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	36,641	4,961
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	659,467	744,996
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	57,377	11,663
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	661,931	178,956
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	131,557	6,647
Total investments with an unrealized loss, fair value	1,321,398	923,952
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	188,934	18,310
State and municipal securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	1,096,601	309,605
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	117,016	2,198
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	35,582	57,270
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	16,368	1,045
Total investments with an unrealized loss, fair value	1,132,183	366,875
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	133,384	3,243
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	59,323	198,349
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	4,955	2,595
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	89,319	6,513
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	11,305	190
Total investments with an unrealized loss, fair value	148,642	204,862
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	16,260	2,785
Corporate notes
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	68,901	14,991
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	6,040	554
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	21,009	20,270
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,446	1,952
Total investments with an unrealized loss, fair value	89,910	35,261
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	$ 7,486	$ 2,506

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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