Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	$ 203,232	$ 199,932
Accumulated Amortization	(124,486)	(113,113)
Valuation Allowance	(825)	(47)
Net Intangible Assets	77,921	86,772
Loan servicing rights
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	98,127	94,827
Accumulated Amortization	(74,624)	(70,095)
Valuation Allowance	(825)	(47)
Net Intangible Assets	22,678	24,685
Core deposits
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	101,160	101,160
Accumulated Amortization	(47,118)	(40,384)
Valuation Allowance	0	0
Net Intangible Assets	54,042	60,776
Other
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	3,945	3,945
Accumulated Amortization	(2,744)	(2,634)
Valuation Allowance	0	0
Net Intangible Assets	$ 1,201	$ 1,311