Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 58,149	$ 48,253	$ 46,967
Property, Plant and Equipment, Net	435,284	363,225
Land Improvement, Building, Leasehold Improvements, ATM, Computers, Furniture, Fixtures, and Auto [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization	34,000	34,000	$ 32,000
Operating leases
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net	$ 45,381	$ 0