Securities - HTM in an Unrealized Loss Position (Details) $ in Thousands	Jun. 30, 2022 USD ($) item	Dec. 31, 2021 USD ($) item
Number of Securities
Unrealized loss for less than twelve months | item	269	2
Unrealized loss for twelve months or longer | item	26	1
Total | item	295	3
Fair Value
Unrealized loss for less than twelve months	$ 682,141	$ 558
Unrealized loss for twelve months or longer	179,478	266
Total	861,619	824
Unrealized Losses
Unrealized loss for less than twelve months	33,098	1
Unrealized loss for twelve months or longer	11,001	2
Total	$ 44,099	$ 3
Residential Mortgage Backed Securities
Number of Securities
Unrealized loss for less than twelve months | item	30
Unrealized loss for twelve months or longer | item	15
Total | item	45
Fair Value
Unrealized loss for less than twelve months	$ 196,968
Unrealized loss for twelve months or longer	102,710
Total	299,678
Unrealized Losses
Unrealized loss for less than twelve months	9,481
Unrealized loss for twelve months or longer	6,506
Total	$ 15,987
Commercial Mortgage Backed Securities
Number of Securities
Unrealized loss for less than twelve months | item	31
Unrealized loss for twelve months or longer | item	1
Total | item	32
Fair Value
Unrealized loss for less than twelve months	$ 180,360
Unrealized loss for twelve months or longer	3,073
Total	183,433
Unrealized Losses
Unrealized loss for less than twelve months	6,347
Unrealized loss for twelve months or longer	196
Total	$ 6,543
Collateralized Mortgage Obligations
Number of Securities
Unrealized loss for less than twelve months | item	47
Unrealized loss for twelve months or longer | item	9
Total | item	56
Fair Value
Unrealized loss for less than twelve months	$ 247,023
Unrealized loss for twelve months or longer	73,481
Total	320,504
Unrealized Losses
Unrealized loss for less than twelve months	11,557
Unrealized loss for twelve months or longer	4,245
Total	$ 15,802
US States and Political Subdivisions Debt Securities
Number of Securities
Unrealized loss for less than twelve months | item	161	2
Unrealized loss for twelve months or longer | item	1	1
Total | item	162	3
Fair Value
Unrealized loss for less than twelve months	$ 57,790	$ 558
Unrealized loss for twelve months or longer	214	266
Total	58,004	824
Unrealized Losses
Unrealized loss for less than twelve months	5,713	1
Unrealized loss for twelve months or longer	54	2
Total	$ 5,767	$ 3