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Securities - Schedule of Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Available-for-sale securities
Fair Value, Less than 12 Months	$ 1,034,589	$ 417,782
Unrealized Losses, Less than 12 Months	16,401	3,014
Fair Value, 12 Months or Longer	12,542	9,266
Unrealized Losses, 12 Months or Longer	759	460
Fair Value	1,047,131	427,048
Unrealized Losses	17,160	3,474
U.S. Treasuries
Available-for-sale securities
Fair Value, Less than 12 Months	69,198
Unrealized Losses, Less than 12 Months	275
Fair Value, 12 Months or Longer	0
Unrealized Losses, 12 Months or Longer	0
Fair Value	69,198
Unrealized Losses	275
Obligations of U.S. Government sponsored entities
Available-for-sale securities
Fair Value, Less than 12 Months	517,624	310,711
Unrealized Losses, Less than 12 Months	7,973	1,992
Fair Value, 12 Months or Longer	0	0
Unrealized Losses, 12 Months or Longer	0	0
Fair Value	517,624	310,711
Unrealized Losses	7,973	1,992
Obligations of U.S. states and political subdivisions
Available-for-sale securities
Fair Value, Less than 12 Months	9,216	8,868
Unrealized Losses, Less than 12 Months	79	40
Fair Value, 12 Months or Longer	0	0
Unrealized Losses, 12 Months or Longer	0	0
Fair Value	9,216	8,868
Unrealized Losses	79	40
U.S. Government agencies
Available-for-sale securities
Fair Value, Less than 12 Months	33,681	10,560
Unrealized Losses, Less than 12 Months	373	396
Fair Value, 12 Months or Longer	3,533	1,819
Unrealized Losses, 12 Months or Longer	344	250
Fair Value	37,214	12,379
Unrealized Losses	717	646
U.S. Government sponsored entities
Available-for-sale securities
Fair Value, Less than 12 Months	404,870	87,643
Unrealized Losses, Less than 12 Months	7,701	586
Fair Value, 12 Months or Longer	6,596	5,068
Unrealized Losses, 12 Months or Longer	328	89
Fair Value	411,466	92,711
Unrealized Losses	8,029	675
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	2,413	2,379
Unrealized Losses, 12 Months or Longer	87	121
Fair Value	2,413	2,379
Unrealized Losses	$ 87	$ 121

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