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Investment Securities (Narrative) (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
security
Sep. 30, 2024
USD ($)
security
Sep. 30, 2025
USD ($)
security
Sep. 30, 2024
USD ($)
security
Dec. 31, 2024
USD ($)
security
Schedule of Available-for-sale Securities [Line Items]          
Number of trading securities held | security 0   0   0
Number of securities held classified as held-to-maturity securities | security 0   0   0
Net unrealized gain on available-for-sale investment securities, net of tax     $ (492,000)   $ (51,300,000)
Net unrealized gain on available-for-sale investment securities, tax     198,000   21,300,000
Number of sales of available-for-sale investment securities during period | security   0   0  
Number of calls of available-for-sale investment securities during period | security   0   0  
Proceeds from sales of available-for-sale investment securities $ 274,700,000   274,708,000    
Realized gains or losses (62,391,000) $ 0 (62,391,000) $ 0  
Purchase of available-for-sale investment securities     163,169,000 5,266,000  
Transfers between investment categories $ 0 0 $ 0 0  
Average purchase yield     4.54%    
Debt securities term 2 years 9 months 18 days   2 years 9 months 18 days    
Credit impairment on securities in unrealized loss position $ 0 $ 0 $ 0 $ 0  
Investment securities with fair value pledged at letters of credit $ 8,900,000   $ 8,900,000   $ 15,500,000
Number of investment securities were pledged to Federal Reserve or Federal Home Loan Bank | security 0   0    
Number of investment securities were pledged to secure public deposits | security 0   0   0
Allowance for credit losses on available-for-sale securities $ 0   $ 0   $ 0
Residential Mortgage-Backed Securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Number of securities which were in a loss position for greater than 12 months | security 3   3