Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	$ 208,255	$ 199,932
Accumulated Amortization	(136,941)	(113,113)
Valuation Allowance	(865)	(47)
Net Intangible Assets	70,449	86,772
Loan servicing rights
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	103,150	94,827
Accumulated Amortization	(80,340)	(70,095)
Valuation Allowance	(865)	(47)
Net Intangible Assets	21,945	24,685
Core deposits
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	101,160	101,160
Accumulated Amortization	(53,747)	(40,384)
Valuation Allowance	0	0
Net Intangible Assets	47,413	60,776
Other
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	3,945	3,945
Accumulated Amortization	(2,854)	(2,634)
Valuation Allowance	0	0
Net Intangible Assets	$ 1,091	$ 1,311