v3.26.1
Note 2 - Business Combinations (Details Textual)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 02, 2026
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Mar. 31, 2026
USD ($)
Feb. 27, 2026
$ / shares
Dec. 31, 2025
USD ($)
Mar. 31, 2025
USD ($)
Goodwill   $ 271,383   $ 271,383       $ 167,450  
Business Combination, Acquisition-Related Cost, Expense   1,695 $ 0 5,676 $ 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   1,100 0 4,800 0        
Goodwill 103,932                
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   1,100 0 15,600 0        
Business Combination, Recognized Liability Assumed, Allowance for Credit Losses, Current   $ 0 $ 0 $ 0 $ 0 $ 14,800     $ 0