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v3.22.2.2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 15, 2022 USD ($) | Oct. 18, 2021 USD ($) branch office $ / shares shares | Sep. 30, 2022 USD ($) branch | Sep. 30, 2022 USD ($) branch | Jun. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) branch | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of banking offices | branch |  |  | 29 | 29 |  |  | 29 |  |  |  |
Acquisition, integration and transaction costs |  |  |  | $ 2,080 | $ 0 | $ 1,000 | $ 2,080 | $ 2,400 |  |  |
Other intangibles |  |  | $ 8,081 | 8,081 |  |  | 8,081 |  | $ 6,411 |  |
Goodwill |  |  | 114,312 | 114,312 | $ 95,127 | 37,144 | 114,312 | 37,144 | 94,301 | $ 37,144 | $ 37,144
Goodwill from business combination |  |  |  | $ 18,190 |  | $ 0 | $ 18,190 | $ 0 |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Closing price of BOC's common stock (in USD per share) | $ / shares |  | $ 18.74 |  |  |  |  |  |  |  |  |
Pacific Mercantile Bancorp (“PMB”) |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Exchange ratio |  | 0.5 |  |  |  |  |  |  |  |  |
Developed technology |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other intangibles | $ 2,800 |  |  |  |  |  |  |  | 0 |  |
Other intangibles |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other intangibles | 1,000 |  |  |  |  |  |  |  | $ 0 |  |
Deepstack Technologies, LLC |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price | 24,000 |  |  |  |  |  |  |  |  |  |
Acquisition, integration and transaction costs |  |  | $ 2,100 |  |  |  |  |  |  |  |
Total consideration | 24,000 |  |  |  |  |  |  |  |  |  |
Cash paid at closing | 14,400 |  |  |  |  |  |  |  |  |  |
Stock consideration | 7,200 |  |  |  |  |  |  |  |  |  |
Additional cashconsideration | $ 2,400 |  |  |  |  |  |  |  |  |  |
Consideration payment period | 18 months |  |  |  |  |  |  |  |  |  |
Goodwill | $ 18,190 |  |  |  |  |  |  |  |  |  |
Pacific Mercantile Bancorp (“PMB”) |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of banking offices | office |  | 7 |  |  |  |  |  |  |  |  |
Aggregate purchase price |  | $ 225,400 |  |  |  |  |  |  |  |  |
Cash paid at closing |  | 3,200 |  |  |  |  |  |  |  |  |
Stock consideration |  | $ 222,200 |  |  |  |  |  |  |  |  |
Number of full service brances | branch |  | 3 |  |  |  |  |  |  |  |  |
Acquisitions shares (in shares) | shares |  | 23,713,417 |  |  |  |  |  |  |  |  |
Shares paid as merger consideration (in shares) | shares |  | 11,856,713 |  |  |  |  |  |  |  |  |
Goodwill from business combination |  | $ 59,000 |  |  |  |  |  |  |  |  |

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