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Note 2 - Acquisition (Details Textual) - SinoPac Bancorp [Member] - USD ($)
Dec. 12, 2017
Nov. 14, 2017
Nov. 04, 2017
Jul. 14, 2017
Dec. 31, 2017
Business Combination, Aggregate Purchase Price       $ 351,600,000  
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares       926,192  
Payments to Acquire Businesses, Gross   $ 100,000,000 $ 100,000,000 $ 285,324,000  
Business Combination, Deferred Payments         $ 35,400,000
Business Combination, Addition Cash Consideration Related to Realized Gain from Sale of Building $ 4,100,000