v3.26.1
SHARE-BASED COMPENSATION PLANS - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Share-based compensation expense $ 1,500 $ 1,200 $ 2,800 $ 3,700
Share-based compensation expense, tax benefit 393 $ 331 654 $ 1,100
Share-based compensation expense not yet recognized $ 12,700   $ 12,700  
Share-based compensation expense not yet recognized, period for recognition     2 years 3 months 29 days  
Mechanics Bank        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Adjustments to additional paid in capital     $ 13,600  
Mechanics Bancorp 2025 Equity Incentive Plan        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Equity incentive plan shares (in shares) 6,792,823   6,792,823  
Restricted Stock Units (RSUs)        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Restricted stock units vested in period, value     $ 2,700  
Restricted Stock Units (RSUs) | Minimum        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Share-based compensation expense, vesting period     3 years  
Restricted Stock Units (RSUs) | Maximum        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Share-based compensation expense, vesting period     4 years  
Performance Shares        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Share-based compensation expense, vesting period     3 years