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Investment Securities - Additional Information (Details)
 6 Months Ended
Jun. 30, 2025
USD ($)
security
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Schedule of Available-for-sale Securities [Line Items]        
Carrying value of investment securities $ 2,680,000,000   $ 2,610,000,000  
Investment securities pledged as collateral 140,800,000   162,400,000  
Available for sale securities sold 0 $ 0    
Allowance for credit losses 2,195,000 2,525,000 2,195,000 $ 2,525,000
Allowance for credit losses 2,005,000 $ 2,005,000 2,005,000 $ 2,005,000
Debt securities available for sale unrealized loss position (312,336,000)   (338,604,000)  
Fair value of unrealized losses $ 309,389,000   334,860,000  
Percentage of Company's investment portfolio 38.70%      
Maturity description of investment portfolio five years or less      
Number of investment securities available for sale | security 1,495      
Number of investment in debt securities available-for-sale unrealized loss position | security 1,260      
Number of investment securities held to maturity | security 513      
Number of investments in debt securities held-to-maturity unrealized loss position | security 502      
Unrealized losses $ (138,321,000)   (132,303,000)  
U.S. government-sponsored enterprises        
Schedule of Available-for-sale Securities [Line Items]        
Allowance for credit losses 0   0  
Allowance for credit losses 0   0  
Debt securities available for sale unrealized loss position (10,314,000)   (14,072,000)  
Fair value of unrealized losses $ 10,180,000   13,746,000  
Number of investment in debt securities available-for-sale unrealized loss position | security 56      
Number of investments in debt securities held-to-maturity unrealized loss position | security 5      
Unrealized losses $ (2,091,000)   (3,021,000)  
U.S. government-sponsored mortgage-backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Allowance for credit losses 0   0  
Allowance for credit losses 0   0  
Debt securities available for sale unrealized loss position (171,466,000)   (203,539,000)  
Fair value of unrealized losses $ 171,095,000   202,451,000  
Number of investment in debt securities available-for-sale unrealized loss position | security 626      
Number of investments in debt securities held-to-maturity unrealized loss position | security 19      
Unrealized losses $ (5,303,000)   (6,695,000)  
Private mortgage-backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Allowance for credit losses 0   0  
Debt securities available for sale unrealized loss position (10,689,000)   (13,249,000)  
Fair value of unrealized losses $ 10,678,000   13,120,000  
Number of investment in debt securities available-for-sale unrealized loss position | security 32      
Non-government-sponsored asset backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Allowance for credit losses $ 0    
Debt securities available for sale unrealized loss position (1,738,000)   (3,434,000)  
Fair value of unrealized losses $ 1,729,000   3,374,000  
Number of investment in debt securities available-for-sale unrealized loss position | security 21      
State and political subdivisions        
Schedule of Available-for-sale Securities [Line Items]        
Allowance for credit losses $ 0   0  
Allowance for credit losses 2,005,000   2,005,000  
Debt securities available for sale unrealized loss position (103,071,000)   (86,029,000)  
Fair value of unrealized losses $ 100,707,000   84,799,000  
Number of investment in debt securities available-for-sale unrealized loss position | security 462      
Number of investments in debt securities held-to-maturity unrealized loss position | security 478      
Unrealized losses $ (130,927,000)   (122,587,000)  
Other securities        
Schedule of Available-for-sale Securities [Line Items]        
Allowance for credit losses 2,195,000   2,195,000  
Debt securities available for sale unrealized loss position (15,058,000)   (18,281,000)  
Fair value of unrealized losses $ 15,000,000   $ 17,370,000  
Number of investment in debt securities available-for-sale unrealized loss position | security 63