Securities Securities - Unrealized Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Investment securities, continuous unrealized loss position [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 1,946,549	$ 407,150
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	21,578	4,277
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	317,275	464,283
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	11,808	13,560
Debt Securities, Available-for-sale, Unrealized Loss Position	2,263,824	871,433
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	33,386	17,837
US Treasury Securities
Investment securities, continuous unrealized loss position [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	178,610	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	881	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position	178,610	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	881	0
U.S. Government Agency Securities
Investment securities, continuous unrealized loss position [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	365,833	9,962
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	3,024	38
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	54,266	6,091
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,974	22
Debt Securities, Available-for-sale, Unrealized Loss Position	420,099	16,053
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	4,998	60
Mortgage-backed Agency Securities
Investment securities, continuous unrealized loss position [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	825,664	165,696
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	11,859	1,772
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	178,956	35,997
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	6,647	555
Debt Securities, Available-for-sale, Unrealized Loss Position	1,004,620	201,693
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	18,506	2,327
State and Municipal Securities
Investment securities, continuous unrealized loss position [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	363,102	175,115
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2,665	2,220
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	57,270	345,435
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,045	10,264
Debt Securities, Available-for-sale, Unrealized Loss Position	420,372	520,550
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	3,710	12,484
Asset-backed Securities
Investment securities, continuous unrealized loss position [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	198,349	46,399
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2,595	207
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	6,513	52,840
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	190	450
Debt Securities, Available-for-sale, Unrealized Loss Position	204,862	99,239
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	2,785	657
Corporate Notes
Investment securities, continuous unrealized loss position [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	14,991	9,978
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	554	40
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	20,270	23,920
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,952	2,269
Debt Securities, Available-for-sale, Unrealized Loss Position	35,261	33,898
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 2,506	$ 2,309

Investment Securities, Continuous Unrealized Loss Position both available-for-sale and held-to-maturity.

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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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Amount of accumulated unrealized loss on 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 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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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 less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of accumulated unrealized loss on 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 less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), in continuous unrealized loss position for 12 months or longer.

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