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Business Combinations - Tri-Valley (Details) - Tri Valley Bank	Apr. 06, 2018 USD ($) shares
Business Combinations
Aggregate transaction value	$ 32,320,000
Shares issued in acquisition | shares	1,889,613
Issuance of shares of common stock to holders of restricted stock	$ 30,725,000
Fixed exchange ratio of company's common stock	0.0489
Total cash paid	$ 1,595,000

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