Premises and Equipment - Net of Accumulated Depreciation (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Premises and Equipment, Net of Accumulated Depreciation
Accumulated depreciation	$ (184,851)	$ (173,647)
Net premises and equipment, excluding ROU assets	327,055	322,419
ROU assets	71,045	50,178
Net premises and equipment	398,100	372,597
Land
Premises and Equipment, Net of Accumulated Depreciation
Premises and equipment, gross	74,285	75,110
Buildings and construction in progress
Premises and Equipment, Net of Accumulated Depreciation
Premises and equipment, gross	306,857	292,371
Furniture, Fixtures and Equipment
Premises and Equipment, Net of Accumulated Depreciation
Premises and equipment, gross	115,370	113,650
Leasehold improvements
Premises and Equipment, Net of Accumulated Depreciation
Premises and equipment, gross	$ 15,394	$ 14,935