v3.26.1
Note 2 - Business Combinations (Details Textual)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 02, 2026
USD ($)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Feb. 27, 2026
$ / shares
Dec. 31, 2025
USD ($)
Goodwill   $ 271,651     $ 167,450
Business Combination, Acquisition-Related Cost, Expense   3,981 $ 0    
Middlefield Banc Corp [Member]          
Business Acquisition, Equity Interests, Exchange Ratio 2.6        
Business Combination, Consideration Transferred $ 277,363        
Business Combination, Price Per Share (in dollars per share) | $ / shares       $ 12.93  
Business Combination, Separately Recognized Transaction, Acquisition-Related Cost, Expensed   3,700 0    
Goodwill 104,201        
Business Combination, Recognized Asset Acquired, Financial Asset, Fair Value 1,460,000        
Business Combination, Recognized Asset Acquired, Financial Asset, Gross Contractual Amount $ 1,480,000        
Business Combination, Acquisition-Related Cost, Expense   14,500 0    
Business Combination, Recognized Liability Assumed, Allowance for Credit Losses, Current   $ 14,800 $ 0