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Investment Securities - Additional Information (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
security
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Schedule of Available-for-sale Securities [Line Items]            
Carrying value of investment securities $ 3,030,000,000.00   $ 3,030,000,000.00 $ 3,570,000,000    
Investment securities pledged as collateral 138,000,000.0   138,000,000.0 142,100,000    
Available for sale securities sold 0 $ 0 0   $ 0  
Provision for credit loss     0 0 1,683,000  
Investment securities, provision for credit losses 2,525,000 2,525,000 2,525,000 2,525,000 2,525,000 $ 842,000
Allowance for credit loss, held-to-maturity 2,005,000 $ 2,005,000 2,005,000 2,005,000 $ 2,005,000 $ 2,005,000
Debt securities available for sale unrealized loss position 348,726,000   348,726,000 336,279,000    
Fair value of unrealized losses $ 345,842,000   $ 345,842,000 333,485,000    
Percentage of Company's investment portfolio     29.60%      
Maturity description of investment portfolio     five years or less      
Number of investment securities available for sale | security 1,559   1,559      
Number of investment in debt securities available-for-sale unrealized loss position | security 1,317   1,317      
Number of investment securities held to maturity | security 508   508      
Unrealized losses $ 119,820,000   $ 119,820,000 112,063,000    
Number of investments in debt securities held-to-maturity unrealized loss position | security 501   501      
U.S. government-sponsored enterprises            
Schedule of Available-for-sale Securities [Line Items]            
Investment securities, provision for credit losses $ 0   $ 0 0    
Allowance for credit loss, held-to-maturity 0   0 0    
Debt securities available for sale unrealized loss position 16,869,000   16,869,000 17,093,000    
Fair value of unrealized losses $ 16,616,000   $ 16,616,000 17,091,000    
Number of investment in debt securities available-for-sale unrealized loss position | security 56   56      
Unrealized losses $ 3,146,000   $ 3,146,000 2,607,000    
Number of investments in debt securities held-to-maturity unrealized loss position | security 5   5      
U.S. government-sponsored mortgage-backed securities            
Schedule of Available-for-sale Securities [Line Items]            
Investment securities, provision for credit losses $ 0   $ 0 0    
Allowance for credit loss, held-to-maturity 0   0 0    
Debt securities available for sale unrealized loss position 201,264,000   201,264,000 191,557,000    
Fair value of unrealized losses $ 201,105,000   $ 201,105,000 189,391,000    
Number of investment in debt securities available-for-sale unrealized loss position | security 656   656      
Unrealized losses $ 6,084,000   $ 6,084,000 4,362,000    
Number of investments in debt securities held-to-maturity unrealized loss position | security 19   19      
Private mortgage-backed securities            
Schedule of Available-for-sale Securities [Line Items]            
Investment securities, provision for credit losses $ 0   $ 0 0    
Debt securities available for sale unrealized loss position 15,418,000   15,418,000 16,117,000    
Fair value of unrealized losses $ 15,418,000   $ 15,418,000 15,891,000    
Number of investment in debt securities available-for-sale unrealized loss position | security 32   32      
Non-government-sponsored asset backed securities            
Schedule of Available-for-sale Securities [Line Items]            
Investment securities, provision for credit losses $ 0   $ 0    
Debt securities available for sale unrealized loss position 5,869,000   5,869,000 7,551,000    
Fair value of unrealized losses $ 5,869,000   $ 5,869,000 7,551,000    
Number of investment in debt securities available-for-sale unrealized loss position | security 27   27      
State and political subdivisions            
Schedule of Available-for-sale Securities [Line Items]            
Investment securities, provision for credit losses $ 0   $ 0 0    
Allowance for credit loss, held-to-maturity 2,005,000   2,005,000 2,005,000    
Debt securities available for sale unrealized loss position 83,006,000   83,006,000 75,931,000    
Fair value of unrealized losses $ 81,843,000   $ 81,843,000 75,531,000    
Number of investment in debt securities available-for-sale unrealized loss position | security 483   483      
Unrealized losses $ 110,590,000   $ 110,590,000 105,094,000    
Number of investments in debt securities held-to-maturity unrealized loss position | security 477   477      
Other securities            
Schedule of Available-for-sale Securities [Line Items]            
Investment securities, provision for credit losses $ 2,525,000   $ 2,525,000 2,525,000    
Debt securities available for sale unrealized loss position 26,300,000   26,300,000 28,030,000    
Fair value of unrealized losses $ 24,991,000   $ 24,991,000 $ 28,030,000    
Number of investment in debt securities available-for-sale unrealized loss position | security 63   63