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Investment Securities - Additional Information (Details)
 3 Months Ended 9 Months Ended
Mar. 31, 2025
USD ($)
security
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Schedule of Available-for-sale Securities [Line Items]        
Carrying value of investment securities $ 2,750,000,000   $ 2,610,000,000  
Investment securities pledged as collateral 161,400,000   162,400,000  
Available for sale securities sold 0 $ 0    
Provision for credit loss 0 0 (330,000)  
Allowance for credit loss, held-to-maturity 2,005,000 $ 2,005,000 2,005,000 $ 2,005,000
Debt securities available for sale unrealized loss position 297,493,000   338,604,000  
Fair value of unrealized losses $ 295,245,000   334,860,000  
Percentage of Company's investment portfolio 38.90%      
Maturity description of investment portfolio five years or less      
Number of investment securities available for sale | security 1,516      
Number of investment in debt securities available-for-sale unrealized loss position | security 1,287      
Number of investment securities held to maturity | security 511      
Unrealized losses $ 116,726,000   132,303,000  
Number of investments in debt securities held-to-maturity unrealized loss position | security 501      
U.S. government-sponsored enterprises        
Schedule of Available-for-sale Securities [Line Items]        
Allowance for credit loss, held-to-maturity $ 0   0  
Debt securities available for sale unrealized loss position 11,520,000   14,072,000  
Fair value of unrealized losses $ 11,305,000   13,746,000  
Number of investment in debt securities available-for-sale unrealized loss position | security 66      
Unrealized losses $ 2,249,000   3,021,000  
Number of investments in debt securities held-to-maturity unrealized loss position | security 5      
U.S. government-sponsored mortgage-backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Allowance for credit loss, held-to-maturity $ 0   0  
Debt securities available for sale unrealized loss position 169,526,000   203,539,000  
Fair value of unrealized losses $ 169,312,000   202,451,000  
Number of investment in debt securities available-for-sale unrealized loss position | security 637      
Unrealized losses $ 4,509,000   6,695,000  
Number of investments in debt securities held-to-maturity unrealized loss position | security 19      
Private mortgage-backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Debt securities available for sale unrealized loss position $ 10,541,000   13,249,000  
Fair value of unrealized losses $ 10,541,000   13,120,000  
Number of investment in debt securities available-for-sale unrealized loss position | security 31      
Non-government-sponsored asset backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Debt securities available for sale unrealized loss position $ 2,772,000   3,434,000  
Fair value of unrealized losses $ 2,549,000   3,374,000  
Number of investment in debt securities available-for-sale unrealized loss position | security 29      
State and political subdivisions        
Schedule of Available-for-sale Securities [Line Items]        
Allowance for credit loss, held-to-maturity $ 2,005,000   2,005,000  
Debt securities available for sale unrealized loss position 87,861,000   86,029,000  
Fair value of unrealized losses $ 86,529,000   84,799,000  
Number of investment in debt securities available-for-sale unrealized loss position | security 461      
Unrealized losses $ 109,968,000   122,587,000  
Number of investments in debt securities held-to-maturity unrealized loss position | security 477      
Other securities        
Schedule of Available-for-sale Securities [Line Items]        
Debt securities available for sale unrealized loss position $ 15,273,000   18,281,000  
Fair value of unrealized losses $ 15,009,000   $ 17,370,000  
Number of investment in debt securities available-for-sale unrealized loss position | security 63