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Loans - Schedule of Financing Receivable, Current, Allowance for Credit Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period $ 61,157 $ 56,241 $ 59,379 $ 54,658 $ 54,658
Additions (deductions)          
Provision for credit losses 2,032 1,510 4,252 3,400  
Recoveries credited to the allowance 473 711 1,604 2,106  
Loans charged against the allowance (1,203) (1,018) (2,776) (2,720)  
Balance at end of period 62,459 57,444 62,459 57,444 59,379
Commercial          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 25,890 18,979 22,872 16,724 16,724
Additions (deductions)          
Provision for credit losses 2,587 1,082 5,617 3,199  
Recoveries credited to the allowance 7 101 73 239  
Loans charged against the allowance 0 0 (78) 0 0
Balance at end of period 28,484 20,162 28,484 20,162 22,872
Mortgage          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 20,752 20,731 22,317 21,386 21,386
Additions (deductions)          
Provision for credit losses (231) (1,004) (1,850) (1,524)  
Recoveries credited to the allowance 35 131 205 270  
Loans charged against the allowance (10) (26) (126) (300) (300)
Balance at end of period 20,546 19,832 20,546 19,832 22,317
Installment          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 3,015 3,901 3,040 4,126 4,126
Additions (deductions)          
Provision for credit losses 470 1,156 929 1,241  
Recoveries credited to the allowance 431 479 1,326 1,597  
Loans charged against the allowance (1,193) (992) (2,572) (2,420) (2,420)
Balance at end of period 2,723 4,544 2,723 4,544 3,040
Subjective Allocation          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 11,500 12,630 11,150 12,422 12,422
Additions (deductions)          
Provision for credit losses (794) 276 (444) 484  
Recoveries credited to the allowance 0 0 0 0  
Loans charged against the allowance 0 0 0 0  
Balance at end of period $ 10,706 $ 12,906 $ 10,706 $ 12,906 $ 11,150