v3.26.1
Fair Value - Financial Assets and Liabilities Measured at Fair Value Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale $ 1,941,624 $ 1,876,830    
Loans held for sale (LHFS) 300,529 278,789    
Mortgage servicing rights (MSR) 141,763 131,289 $ 132,702 $ 139,317
U.S. Treasury Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 207,053 208,948    
U.S. Government Agency Obligations [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 69,929 70,849    
Recurring Basis [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 1,941,624 1,876,830    
Loans held for sale (LHFS) 300,529 278,789    
Mortgage servicing rights (MSR) 141,763 131,289    
Other assets 13,822 16,235    
Other liabilities $ 28,454 $ 22,832    
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 $ 207,053 $ 208,948    
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 69,929 70,849    
Recurring Basis [Member] | Mortgage-Backed Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 1,664,642 1,597,033    
Level 1 [Member] | Recurring Basis [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available for sale 207,053 208,948    
Loans held for sale (LHFS) 0 0    
Mortgage servicing rights (MSR) 0 0    
Other assets 2,690 11    
Other liabilities 55 1,708    
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 207,053 208,948    
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 1,734,571 1,667,882    
Loans held for sale (LHFS) 300,529 278,789    
Mortgage servicing rights (MSR) 0 0    
Other assets 10,058 15,226    
Other liabilities 28,399 21,124    
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 69,929 70,849    
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 1,664,642 1,597,033    
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) 141,763 131,289    
Other assets 1,074 998    
Other liabilities 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