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Note 19 - Westamerica Bancorporation (Parent Company Only Condensed Financial Information) - Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Premises and equipment, net $ 34,507 $ 35,301    
Other assets 162,906 158,450    
Total assets 5,568,526 5,513,046    
Other liabilities 34,849 36,723    
Total liabilities 4,952,935 4,922,807    
Shareholders' equity 615,591 590,239 $ 561,367 $ 532,205
Total liabilities and shareholders' equity 5,568,526 5,513,046    
Parent Company [Member]        
Cash 72,878 53,409 $ 64,054 $ 26,453
Investment securities available for sale    
Premises and equipment, net 10,400 9,639    
Accounts receivable from Westamerica Bank 580 538    
Other assets 36,990 40,547    
Total assets 630,428 605,364    
Accounts payable to Westamerica Bank 46 92    
Other liabilities 14,791 15,033    
Total liabilities 14,837 15,125    
Shareholders' equity 615,591 590,239    
Total liabilities and shareholders' equity 630,428 605,364    
Parent Company [Member] | Westamerica Bank [Member]        
Investment 509,125 500,776    
Parent Company [Member] | Non-bank Subsidiaries [Member]        
Investment $ 455 $ 455