v3.26.3
ACQUISITIONS - Narrative (Details)
$ / shares in Units, $ in Thousands, shares in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Feb. 01, 2026
USD ($)
trading_day
$ / shares
shares
Jan. 31, 2026
banking_center
Sep. 30, 2026
USD ($)
Sep. 30, 2026
USD ($)
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 $ 243,200      
Acquisition-date allowance for credit losses 22,280      
Non-credit fair value discount 53,100      
Pre-tax discount 900      
Pre-tax premium on FHLB 700      
Other intangibles acquired 30,200      
Integration and transaction‑related expenses     $ 900 $ 21,700
First Savings | Financial Asset Acquired with Credit Deterioration        
Business Combination [Line Items]        
Acquisition-date allowance for credit losses 7,100      
First Savings | Financial Asset Acquired and No Credit Deterioration        
Business Combination [Line Items]        
Acquisition-date allowance for credit losses 15,200      
First Savings | Contract termination and similar charges        
Business Combination [Line Items]        
Integration and transaction‑related expenses     600 11,200
First Savings | Other integration-related expenditures        
Business Combination [Line Items]        
Integration and transaction‑related expenses     200  
First Savings | Salaries and benefits        
Business Combination [Line Items]        
Integration and transaction‑related expenses     $ 100 5,900
First Savings | Acquisition-related professional and advisory services        
Business Combination [Line Items]        
Integration and transaction‑related expenses       $ 3,000
First Savings | Core Deposits        
Business Combination [Line Items]        
Other intangibles acquired $ 29,400      
Useful life of core deposit intangibles and other intangibles 10 years      
First Savings | Other Intangible Assets        
Business Combination [Line Items]        
Other intangibles acquired $ 800      
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