Goodwill and Other Intangible Assets - Other Intangible Assets, Textual (Details) - Core Deposits	3 Months Ended
	Mar. 31, 2020
Premier Commercial Bancorp
Finite-Lived Intangible Assets [Line Items]
Useful life	10 years
Puget Sound Bancorp
Finite-Lived Intangible Assets [Line Items]
Useful life	10 years
Washington Banking Company
Finite-Lived Intangible Assets [Line Items]
Useful life	10 years
Valley Community Bancshares
Finite-Lived Intangible Assets [Line Items]
Useful life	10 years