Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Goodwill and Other Intangible Assets - Textuals (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill impairment charges	$ 0	$ 0	$ 0
Puget Sound Bank \| Core Deposits
Finite-Lived Intangible Assets [Line Items]
Useful life	10 years
Premier Commercial \| Core Deposits
Finite-Lived Intangible Assets [Line Items]
Useful life	10 years
Washington Banking \| Core Deposits
Finite-Lived Intangible Assets [Line Items]
Useful life	10 years
Valley Community Bancshares \| Core Deposits
Finite-Lived Intangible Assets [Line Items]
Useful life	10 years
Northwest Commercial Bank [Member] \| Core Deposits
Finite-Lived Intangible Assets [Line Items]
Useful life	5 years