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Other Assets - Bank-Owned Life Insurance and Mortgage Servicing Rights (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Other Intangible Assets          
Noncash exchange of certain BOLI $ 0 $ 5,500 $ 81,700 $ 185,800  
Gain or loss recognized as part of exchange 0 0 0 0  
Unpaid principal amount of consumer loans serviced for others 1,100,000   1,100,000   $ 1,300,000
Contractually specified fees, late charges, and ancillary fees 700 800 2,200 2,400  
Amortization of mortgage servicing rights 144 $ 258 497 $ 755  
Servicing Contracts          
Estimated future amortization expenses for MSRs over the next five years          
Under one year 673   673    
One to two years 596   596    
Two to three years 528   528    
Three to four years 469   469    
Four to five years 416   416    
Mortgage servicing rights          
Gross carrying amount 70,050   70,050   69,903
Less: accumulated amortization 65,322   65,322   64,825
Net carrying value $ 4,728   $ 4,728   $ 5,078