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Acquisition | 9 Months Ended
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Sep. 30, 2018
Business Combinations [Abstract] |
Acquisition | Acquisition On November 21, 2017, we completed the merger of Bank of Napa, N.A. (OTCQB: BNNP), to enhance our market presence in Napa, California. Bank of Napa was a national bank with two branch offices serving Napa. The acquisition added $134.7 million in loans, $249.9 million in deposits and $75.5 million in investment securities to Bank of Marin as of the acquisition date. Bank of Napa shareholders received 0.307 shares of Bancorp common stock for each share of Bank of Napa common stock outstanding. We have accounted for the acquisition of Bank of Napa as a business combination under the acquisition method of accounting. The assets acquired and liabilities assumed, both tangible and intangible, were recorded at their fair values as of the acquisition date in accordance with ASC 805, Business Combinations. The acquisition was treated as a "reorganization" within the definition of section 368(a) of the Internal Revenue Code and is generally considered tax-free for U.S. federal income tax purposes. The Bank of Napa acquisition resulted in $23.7 million in goodwill, which represents the excess of the total purchase price paid over the fair value of the assets acquired, net of the fair values of liabilities assumed. Goodwill mainly reflects expected value created through the combined operations of Bank of Napa and Bank of Marin, which we evaluate for impairment annually. We determined that the fair value of our traditional community banking activities (provided through our branch network) exceeded the carrying amount of the bank-level reporting unit. The goodwill is not deductible for tax purposes. The core deposit intangible represents the estimated future benefits of acquired deposits and is booked separately from the related deposits. We recorded a core deposit intangible asset of $4.4 million from the Bank of Napa acquisition on November 21, 2017, of which $56 thousand was amortized in 2017 and $381 thousand was amortized in the first nine months of 2018. The core deposit intangible is amortized on an accelerated basis over an estimated ten-year life, and is evaluated periodically for impairment. No impairment loss was recognized as of September 30, 2018. Acquisition-related expenses are recognized as incurred and continue until all systems have been converted and operational functions become fully integrated. Bank of Marin Bancorp incurred acquisition-related expenses in the consolidated statements of comprehensive income for the three and nine months ended September 30, 2018 as follows:
| Three months ended |  | Nine months ended
(in thousands) | September 30, 2018 | September 30, 2017 |  | September 30, 2018 | September 30, 2017
Data processing1 | $ | 43 |  | $ | — |  |  | $ | 598 |  | $ | — |
Professional services | 46 |  | 449 |  |  | 172 |  | 458 |
Personnel severance | — |  | — |  |  | 141 |  | — |
Other | — |  | 46 |  |  | 43 |  | 46 |
Total | $ | 89 |  | $ | 495 |  |  | $ | 954 |  | $ | 504 |
1 Primarily relates to Bank of Napa's core processing system contract termination and deconversion fees.

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- Definition The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -URI http://asc.fasb.org/topic&trid=2303972 + Details
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- References No definition available. + Details
Name: | us-gaap_BusinessCombinationsAbstract
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