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Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jun. 07, 2020
Premises and equipment
Total	$ 844,031	$ 836,390
Less accumulated depreciation	(285,532)	(257,151)
Net premises and equipment	558,499	579,239
Depreciation expense charged to operations	29,200	25,300	$ 18,200
2018-15
Premises and equipment
Capitalized implementation costs related to internal use software	0
CSFL
Premises and equipment
Premises and equipment				$ 313,435
Land
Premises and equipment
Total	145,276	152,263
Buildings and leasehold improvements
Premises and equipment
Total	$ 404,655	406,078
Buildings and leasehold improvements | Minimum
Premises and equipment
Useful Life	15 years
Buildings and leasehold improvements | Maximum
Premises and equipment
Useful Life	40 years
Equipment and furnishings
Premises and equipment
Total	$ 169,271	161,009
Equipment and furnishings | Minimum
Premises and equipment
Useful Life	3 years
Equipment and furnishings | Maximum
Premises and equipment
Useful Life	10 years
Construction in process
Premises and equipment
Total	$ 14,518	3,618
Computer software
Premises and equipment
Useful Life	36 months
Total	$ 43,500	37,400
Depreciation expense charged to operations	4,800	2,400	$ 1,200
Lease right of use assets
Premises and equipment
Total	$ 110,311	$ 113,422

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