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Fair Value - Financial Assets and Liabilities Measured at Fair Value Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale $ 1,876,830 $ 1,692,534  
Loans held for sale (LHFS) 278,789 200,307  
Mortgage servicing rights (MSR) 131,289 139,317 $ 131,870
U.S. Treasury Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 208,948 202,669  
U.S. Government Agency Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 70,849 38,807  
Recurring Basis [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 1,876,830 1,692,534  
Loans held for sale (LHFS) 278,789 200,307  
Mortgage servicing rights (MSR) 131,289 139,317  
Other assets - derivatives 16,235 15,397  
Other liabilities - derivatives $ 22,832 $ 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 $ 208,948 $ 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 70,849 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 1,597,033 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 208,948 202,669  
Loans held for sale (LHFS) 0 0  
Mortgage servicing rights (MSR) 0 0  
Other assets - derivatives 11 18  
Other liabilities - derivatives 1,708 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 208,948 202,669  
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 1,667,882 1,489,865  
Loans held for sale (LHFS) 278,789 200,307  
Mortgage servicing rights (MSR) 0 0  
Other assets - derivatives 15,226 15,150  
Other liabilities - derivatives 21,124 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 70,849 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 1,597,033 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) 131,289 139,317  
Other assets - derivatives 998 229  
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