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Investment Securities - Additional Information (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
security
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Schedule of Available-for-sale Securities [Line Items]            
Carrying value of investment securities $ 2,370,000,000 $ 3,570,000,000   $ 2,370,000,000    
Investment securities pledged as collateral 179,400,000 142,100,000   179,400,000    
Available for sale securities sold 0   $ 0 0 $ 0  
Provision for credit loss (330,000) 0     1,683,000  
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 261,809,000 336,279,000   261,809,000    
Fair value of unrealized losses $ 260,071,000 333,485,000   $ 260,071,000    
Percentage of Company's investment portfolio       38.60%    
Maturity description of investment portfolio       five years or less    
Number of investment securities available for sale | security 1,550     1,550    
Number of investment in debt securities available-for-sale unrealized loss position | security 1,256     1,256    
Number of investment securities held to maturity | security 510     510    
Unrealized losses $ 83,586,000 112,063,000   $ 83,586,000    
Number of investments in debt securities held-to-maturity unrealized loss position | security 488     488    
U.S. government-sponsored enterprises            
Schedule of Available-for-sale Securities [Line Items]            
Allowance for credit loss, held-to-maturity $ 0 0   $ 0    
Debt securities available for sale unrealized loss position 11,248,000 17,093,000   11,248,000    
Fair value of unrealized losses $ 11,116,000 17,091,000   $ 11,116,000    
Number of investment in debt securities available-for-sale unrealized loss position | security 54     54    
Unrealized losses $ 1,712,000 2,607,000   $ 1,712,000    
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]            
Allowance for credit loss, held-to-maturity $ 0 0   $ 0    
Debt securities available for sale unrealized loss position 150,070,000 191,557,000   150,070,000    
Fair value of unrealized losses $ 150,047,000 189,391,000   $ 150,047,000    
Number of investment in debt securities available-for-sale unrealized loss position | security 645     645    
Unrealized losses $ 2,288,000 4,362,000   $ 2,288,000    
Number of investments in debt securities held-to-maturity unrealized loss position | security 12     12    
Private mortgage-backed securities            
Schedule of Available-for-sale Securities [Line Items]            
Debt securities available for sale unrealized loss position $ 9,090,000 16,117,000   $ 9,090,000    
Fair value of unrealized losses $ 9,090,000 15,891,000   $ 9,090,000    
Number of investment in debt securities available-for-sale unrealized loss position | security 31     31    
Non-government-sponsored asset backed securities            
Schedule of Available-for-sale Securities [Line Items]            
Debt securities available for sale unrealized loss position $ 2,945,000 7,551,000   $ 2,945,000    
Fair value of unrealized losses $ 2,945,000 7,551,000   $ 2,945,000    
Number of investment in debt securities available-for-sale unrealized loss position | security 24     24    
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   $ 2,005,000    
Debt securities available for sale unrealized loss position 66,804,000 75,931,000   66,804,000    
Fair value of unrealized losses $ 66,300,000 75,531,000   $ 66,300,000    
Number of investment in debt securities available-for-sale unrealized loss position | security 439     439    
Unrealized losses $ 79,586,000 105,094,000   $ 79,586,000    
Number of investments in debt securities held-to-maturity unrealized loss position | security 471     471    
Other securities            
Schedule of Available-for-sale Securities [Line Items]            
Debt securities available for sale unrealized loss position $ 21,652,000 28,030,000   $ 21,652,000    
Fair value of unrealized losses $ 20,573,000 $ 28,030,000   $ 20,573,000    
Number of investment in debt securities available-for-sale unrealized loss position | security 63     63