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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) $ / shares in Units, $ in Millions |  | 3 Months Ended
--- | --- | ---
Oct. 18, 2021 USD ($) office branch $ / shares shares | Jun. 30, 2022 USD ($) branch
Restructuring Cost and Reserve [Line Items] |  |
Number of banking offices | branch |  | 31
Purchase of mortgage servicing rights |  | $ 22.8
Unpaid principal balance on underlying loans of MSRs |  | $ 1,730.0
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 |
Pacific Mercantile Bancorp (“PMB”) |  |
Restructuring Cost and Reserve [Line Items] |  |
Number of banking offices | office | 7 |
Number of full service brances | branch | 3 |
Acquisitions shares (in shares) | shares | 23,713,417 |
Cash paid at closing | $ 3.2 |
Shares paid as merger consideration (in shares) | shares | 11,856,713 |
Stock consideration | $ 222.2 |
Aggregate purchase price | 225.4 |
Goodwill | $ 58.0 |

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