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Acquisitions - Additional information (Details) - Acquired Loans
$ in Thousands
Dec. 31, 2017
USD ($)
Security California Bancorp  
Business Acquisition [Line Items]  
Contractual amounts due $ 539,806
Cash flows not expected to be collected 2,765
Expected cash flows 537,041
Interest component of expected cash flows 80,883
Fair value of acquired loans 456,158
Heritage Oaks Bank  
Business Acquisition [Line Items]  
Contractual amounts due 1,717,230
Cash flows not expected to be collected 4,442
Expected cash flows 1,712,788
Interest component of expected cash flows 348,100
Fair value of acquired loans 1,364,688
Plaza Bancorp  
Business Acquisition [Line Items]  
Contractual amounts due 1,703,246
Cash flows not expected to be collected 20,152
Expected cash flows 1,683,094
Interest component of expected cash flows 625,592
Fair value of acquired loans $ 1,057,502