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Acquisition of First Priority Financial Corp. (Fair Value Adjustments) (Details) - First Priority Financial Corp. [Member] - USD ($)	Jan. 08, 2018	Jul. 31, 2018
Business Acquisition [Line Items]
Gross amortized cost basis at January 8, 2018	$ 521,644,000
Market rate adjustment	(3,023,000)
Credit fair value adjustment on pools of homogeneous loans	(6,742,000)
Credit fair value adjustment on impaired loans	(256,000)
Fair value of purchased loans at January 8, 2018	$ 511,623,000	$ 511,623,000

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