Goodwill and Intangible Assets - Schedule of Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]
Goodwill, Gross Carrying Value	$ 108,752	$ 108,752
Goodwill, Accumulated Amortization	3,760	3,760
Goodwill and Intangible Assets, Gross Carrying Value	160,511	160,251
Goodwill and Intangible Assets, Accumulated Amortization	31,885	28,438
Intangibles from Branch Acquisition
Finite Lived Intangible Assets [Line Items]
Intangible Assets, Gross Carrying Value	3,015	3,015
Intangible Assets, Accumulated Amortization	3,015	3,015
Core Deposit Intangibles
Finite Lived Intangible Assets [Line Items]
Intangible Assets, Gross Carrying Value	32,355	32,355
Intangible Assets, Accumulated Amortization	20,214	17,746
Other Intangibles
Finite Lived Intangible Assets [Line Items]
Intangible Assets, Gross Carrying Value	16,389	16,129
Intangible Assets, Accumulated Amortization	$ 4,896	$ 3,917