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Note 20 - Westamerica Bancorporation (Parent Company Only) (Detail) - Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Activities      
Net income $ 81,127 $ 87,888 $ 94,577
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 14,074 14,253 15,327
Increase in other assets 142 2,773 23,404
Stock option compensation expense 1,450 1,425 1,380
Tax benefit decrease (increase) upon exercise of stock options 119 248 (1,004)
(Refund) provision for deferred income tax (8,394) 1,213 (10,761)
Increase in other liabilities 17,147 431 (16,767)
Net cash provided by operating activities 119,464 120,393 114,970
Investing Activities      
Purchases of premises and equipment (4,834) (3,309) (1,448)
Net cash used in investing activities 5,697 67,645 298,515
Financing Activities      
Net change in short-term debt (62,001) (16,868) (205,819)
Exercise of stock options/issuance of shares 7,635 14,374 16,688
Tax benefit (decrease) increase upon exercise of stock options (119) (248) 1,004
Retirement of common stock including repurchases (51,499) (60,505) (28,719)
Dividends (41,005) (41,670) (42,094)
Net cash used in financing activities (163,824) 3,214 (435,827)
Net change in cash (38,663) 191,252 (22,342)
Supplemental disclosure of cash flow activity:      
Interest paid for the period 6,814 11,271 15,414
Income tax payments for the period 34,111 28,826 50,388
Parent Company [Member]
     
Operating Activities      
Net income 81,127 87,888 94,577
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 297 126 172
Decrease (increase) in accounts receivable from affiliates 105 (18) (11)
Increase in other assets (1,960) (1,951) (2,212)
Stock option compensation expense 1,450 1,425 1,380
Tax benefit decrease (increase) upon exercise of stock options 119 248 (1,004)
(Refund) provision for deferred income tax (1,306) 963 789
Increase in other liabilities 1,182 217 1,833
Earnings of subsidiaries less (greater) than subsidiary dividends 7,746 17,523 (27,896)
Writedown of property and equipment 1,504 599 228
Net cash provided by operating activities 90,264 107,020 67,856
Investing Activities      
Purchases of premises and equipment (420) (1,154) (30)
Net decrease in short term investments   341  
Net cash used in investing activities (420) (813) (30)
Financing Activities      
Net change in short-term debt   (1,000) (14,700)
Net reductions in notes payable and long-term borrowings   (10,000)  
Exercise of stock options/issuance of shares 7,635 14,374 16,688
Tax benefit (decrease) increase upon exercise of stock options (119) (248) 1,004
Retirement of common stock including repurchases (51,499) (60,505) (28,719)
Dividends (41,005) (41,670) (42,094)
Net cash used in financing activities (84,988) (99,049) (67,821)
Net change in cash 4,856 7,158 5
Cash at beginning of year 8,363 1,205 1,200
Cash at end of year 13,219 8,363 1,205
Supplemental disclosure of cash flow activity:      
Interest paid for the period 1,105 1,794 1,824
Income tax payments for the period $ 34,111 $ 28,826 $ 50,388