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Fair Value - Financial Assets and Liabilities Measured at Fair Value Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale $ 1,814,245 $ 1,692,534    
Loans held for sale (LHFS) 228,141 200,307    
Mortgage servicing rights (MSR) 131,676 139,317 $ 125,853 $ 131,870
U.S. Treasury Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 208,269 202,669    
U.S. Government Agency Obligations [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 70,535 38,807    
Recurring Basis [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 1,814,245 1,692,534    
Loans held for sale (LHFS) 228,141 200,307    
Mortgage servicing rights (MSR) 131,676 139,317    
Other assets - derivatives 18,899 15,397    
Other liabilities - derivatives $ 21,081 $ 41,355    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities Other Liabilities    
Recurring Basis [Member] | U.S. Treasury Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale $ 208,269 $ 202,669    
Recurring Basis [Member] | U.S. Government Agency Obligations [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 70,535 38,807    
Recurring Basis [Member] | Mortgage-Backed Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 1,535,441 1,451,058    
Level 1 [Member] | Recurring Basis [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 208,269 202,669    
Loans held for sale (LHFS) 0 0    
Mortgage servicing rights (MSR) 0 0    
Other assets - derivatives 1,300 18    
Other liabilities - derivatives 78 2,183    
Level 1 [Member] | Recurring Basis [Member] | U.S. Treasury Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 208,269 202,669    
Level 1 [Member] | Recurring Basis [Member] | U.S. Government Agency Obligations [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0 0    
Level 1 [Member] | Recurring Basis [Member] | Mortgage-Backed Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0 0    
Level 2 [Member] | Recurring Basis [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 1,605,976 1,489,865    
Loans held for sale (LHFS) 228,141 200,307    
Mortgage servicing rights (MSR) 0 0    
Other assets - derivatives 16,259 15,150    
Other liabilities - derivatives 21,003 39,172    
Level 2 [Member] | Recurring Basis [Member] | U.S. Treasury Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0 0    
Level 2 [Member] | Recurring Basis [Member] | U.S. Government Agency Obligations [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 70,535 38,807    
Level 2 [Member] | Recurring Basis [Member] | Mortgage-Backed Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 1,535,441 1,451,058    
Level 3 [Member] | Recurring Basis [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0 0    
Loans held for sale (LHFS) 0 0    
Mortgage servicing rights (MSR) 131,676 139,317    
Other assets - derivatives 1,340 229    
Other liabilities - derivatives 0 0    
Level 3 [Member] | Recurring Basis [Member] | U.S. Treasury Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0 0    
Level 3 [Member] | Recurring Basis [Member] | U.S. Government Agency Obligations [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 0 0    
Level 3 [Member] | Recurring Basis [Member] | Mortgage-Backed Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale $ 0 $ 0