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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
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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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