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Loans - Schedule of Financing Receivable, Current, Allowance for Credit Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period $ 63,445 $ 59,379 $ 59,379
Additions (deductions)      
Provision for credit losses 540 724  
Recoveries credited to the allowance 499 550  
Loans charged against the allowance (765) (618)  
Balance at end of period 63,719 60,035 63,445
Commercial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 29,012 22,872 22,872
Additions (deductions)      
Provision for credit losses 189 1,379  
Recoveries credited to the allowance 13 46  
Loans charged against the allowance (37) 0 0
Balance at end of period 29,177 24,297 29,012
Mortgage      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 20,914 22,317 22,317
Additions (deductions)      
Provision for credit losses 93 (2,379)  
Recoveries credited to the allowance 32 122  
Loans charged against the allowance (5) (24) (24)
Balance at end of period 21,034 20,036 20,914
Installment      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 2,639 3,040 3,040
Additions (deductions)      
Provision for credit losses 163 59  
Recoveries credited to the allowance 454 382  
Loans charged against the allowance (723) (594) (594)
Balance at end of period 2,533 2,887 2,639
Subjective Allocation      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 10,880 11,150 11,150
Additions (deductions)      
Provision for credit losses 95 1,665  
Recoveries credited to the allowance 0 0  
Loans charged against the allowance 0 0  
Balance at end of period $ 10,975 $ 12,815 $ 10,880