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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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