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Securities - Schedule of Available-for-sale Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Available-for-sale securities
Fair Value, Less than 12 Months	$ 567,682	$ 1,095,830
Unrealized Losses, Less than 12 Months	56,884	20,921
Fair Value, 12 Months or Longer	1,172,857	394,300
Unrealized Losses, 12 Months or Longer	212,290	11,982
Fair Value	1,740,539	1,490,130
Unrealized Losses	269,174	32,903
U.S. Treasuries
Available-for-sale securities
Fair Value, Less than 12 Months	46,222	147,810
Unrealized Losses, Less than 12 Months	5,380	2,542
Fair Value, 12 Months or Longer	120,382	0
Unrealized Losses, 12 Months or Longer	19,124	0
Fair Value	166,604	147,810
Unrealized Losses	24,504	2,542
Obligations of U.S. Government sponsored entities
Available-for-sale securities
Fair Value, Less than 12 Months	182,146	362,895
Unrealized Losses, Less than 12 Months	13,817	6,694
Fair Value, 12 Months or Longer	547,882	289,210
Unrealized Losses, 12 Months or Longer	84,468	8,678
Fair Value	730,028	652,105
Unrealized Losses	98,285	15,372
Obligations of U.S. states and political subdivisions
Available-for-sale securities
Fair Value, Less than 12 Months	74,961	9,700
Unrealized Losses, Less than 12 Months	9,682	85
Fair Value, 12 Months or Longer	8,075	1,283
Unrealized Losses, 12 Months or Longer	2,419	15
Fair Value	83,036	10,983
Unrealized Losses	12,101	100
U.S. Government agencies
Available-for-sale securities
Fair Value, Less than 12 Months	30,615	22,074
Unrealized Losses, Less than 12 Months	2,076	160
Fair Value, 12 Months or Longer	24,071	16,846
Unrealized Losses, 12 Months or Longer	4,427	372
Fair Value	54,686	38,920
Unrealized Losses	6,503	532
U.S. Government sponsored entities
Available-for-sale securities
Fair Value, Less than 12 Months	233,738	553,351
Unrealized Losses, Less than 12 Months	25,929	11,440
Fair Value, 12 Months or Longer	470,077	84,537
Unrealized Losses, 12 Months or Longer	101,722	2,841
Fair Value	703,815	637,888
Unrealized Losses	127,651	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	2,370	2,424
Unrealized Losses, 12 Months or Longer	130	76
Fair Value	2,370	2,424
Unrealized Losses	$ 130	$ 76

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