Premises and Equipment, Net - Premises and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Premises and Equipment, Net, by Type [Abstract]
Total cost of premises and equipment	$ 467,235	$ 449,815
Less accumulated depreciation and amortization	271,334	263,147
Premises and equipment, net	195,901	186,668
Finance lease right-of-use assets	6,017	7,471
Assets held for sale	3,726	139
Total premises and equipment, net	205,644	194,278
Land [Member]
Premises and Equipment, Net, by Type [Abstract]
Total cost of premises and equipment	54,342	52,189
Building and Leasehold Improvements [Member]
Premises and Equipment, Net, by Type [Abstract]
Total cost of premises and equipment	221,986	216,650
Furniture and Equipment [Member]
Premises and Equipment, Net, by Type [Abstract]
Total cost of premises and equipment	$ 190,907	$ 180,976