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Note 18 - Westamerica Bancorporation (Parent Company Only Condensed Financial Information) - Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Premises and equipment, net $ 28,819 $ 31,155    
Other assets 319,146 185,415    
Total assets 6,950,317 7,461,026    
Other liabilities 65,125 73,722    
Total liabilities 6,348,207 6,633,924    
Shareholders' equity 602,110 827,102 $ 844,809 $ 731,417
Total liabilities and shareholders' equity 6,950,317 7,461,026    
Parent Company [Member]        
Cash 99,478 69,943    
Premises and equipment, net 9,411 9,968    
Accounts receivable from Westamerica Bank 245 224    
Other assets 44,831 42,026    
Total assets 618,918 843,229    
Accounts payable to Westamerica Bank 40 62    
Other liabilities 16,768 16,065    
Total liabilities 16,808 16,127    
Shareholders' equity 602,110 827,102    
Total liabilities and shareholders' equity 618,918 843,229    
Parent Company [Member] | Bank Subsidiary [Member]        
Investment 464,500 720,614    
Parent Company [Member] | Non-bank Subsidiaries [Member]        
Investment $ 453 $ 454