Securities - Schedule of Available-for-sale Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Available-for-sale securities
Fair Value, Less than 12 Months	$ 1,151,338	$ 1,095,830
Unrealized Losses, Less than 12 Months	84,404	20,921
Fair Value, 12 Months or Longer	693,287	394,300
Unrealized Losses, 12 Months or Longer	99,044	11,982
Fair Value	1,844,625	1,490,130
Unrealized Losses	183,448	32,903
U.S. Treasuries
Available-for-sale securities
Fair Value, Less than 12 Months	169,550	147,810
Unrealized Losses, Less than 12 Months	16,547	2,542
Fair Value, 12 Months or Longer	4,552	0
Unrealized Losses, 12 Months or Longer	402	0
Fair Value	174,102	147,810
Unrealized Losses	16,949	2,542
Obligations of U.S. Government sponsored entities
Available-for-sale securities
Fair Value, Less than 12 Months	353,414	362,895
Unrealized Losses, Less than 12 Months	23,720	6,694
Fair Value, 12 Months or Longer	411,422	289,210
Unrealized Losses, 12 Months or Longer	46,058	8,678
Fair Value	764,836	652,105
Unrealized Losses	69,778	15,372
Obligations of U.S. states and political subdivisions
Available-for-sale securities
Fair Value, Less than 12 Months	71,476	9,700
Unrealized Losses, Less than 12 Months	6,901	85
Fair Value, 12 Months or Longer	3,123	1,283
Unrealized Losses, 12 Months or Longer	736	15
Fair Value	74,599	10,983
Unrealized Losses	7,637	100
U.S. Government agencies
Available-for-sale securities
Fair Value, Less than 12 Months	36,509	22,074
Unrealized Losses, Less than 12 Months	1,299	160
Fair Value, 12 Months or Longer	21,389	16,846
Unrealized Losses, 12 Months or Longer	2,810	372
Fair Value	57,898	38,920
Unrealized Losses	4,109	532
U.S. Government sponsored entities
Available-for-sale securities
Fair Value, Less than 12 Months	520,389	553,351
Unrealized Losses, Less than 12 Months	35,937	11,440
Fair Value, 12 Months or Longer	250,441	84,537
Unrealized Losses, 12 Months or Longer	48,898	2,841
Fair Value	770,830	637,888
Unrealized Losses	84,835	14,281
U.S. corporate debt securities
Available-for-sale securities
Fair Value, Less than 12 Months	0	0
Unrealized Losses, Less than 12 Months	0	0
Fair Value, 12 Months or Longer	2,360	2,424
Unrealized Losses, 12 Months or Longer	140	76
Fair Value	2,360	2,424
Unrealized Losses	$ 140	$ 76

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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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