v3.26.1
ACQUISITIONS - Narrative (Details)
$ / shares in Units, shares in Millions, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Feb. 01, 2026
USD ($)
trading_day
$ / shares
shares
Jan. 31, 2026
banking_center
Jun. 30, 2026
USD ($)
Jun. 30, 2026
USD ($)
First Savings        
Business Combination [Line Items]        
Exchange ratio 0.85      
Share price (in dollars per share) | $ / shares $ 32.59      
Number of consecutive trading days | trading_day 10      
Purchase price $ 243.2      
Other intangibles acquired 30.2      
Merger-related expenses     $ 3.8 $ 20.8
First Savings | Income Statement Location [Axis]: us-gaap:BusinessCombinationIntegrationRelatedCosts        
Business Combination [Line Items]        
Merger-related expenses     0.9  
First Savings | Income Statement Location [Axis]: us-gaap:LaborAndRelatedExpense        
Business Combination [Line Items]        
Merger-related expenses     0.6 5.8
First Savings | Income Statement Location [Axis]: us-gaap:OtherNoninterestExpense        
Business Combination [Line Items]        
Merger-related expenses     $ 2.3 10.7
First Savings | Income Statement Location [Axis]: us-gaap:ProfessionalAndContractServicesExpense        
Business Combination [Line Items]        
Merger-related expenses       $ 3.0
First Savings | Core Deposits        
Business Combination [Line Items]        
Other intangibles acquired $ 29.4      
Useful life of core deposit intangibles and other intangibles 10 years      
First Savings | Other Intangible Assets        
Business Combination [Line Items]        
Other intangibles acquired $ 0.8      
Useful life of core deposit intangibles and other intangibles 1 year      
First Savings | Common Stock        
Business Combination [Line Items]        
Issuance of common stock related to acquisitions (in shares) | shares 6.1      
First Savings        
Business Combination [Line Items]        
Number of banking centers | banking_center   16