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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract]  
Summary of amortized cost, gross unrealized loss, and fair value of securities held-to-maturity
The following table summarizes investment securities (in thousands):
 December 31,
 20252024
Trading securities - at fair value:  
U.S. treasury obligations$40,029 $28,511 
Mutual funds33,559 13,627 
Money market funds— 110 
Equity securities2,505 8 
Debt securities15 11 
Total trading securities$76,108 $42,267 
Held-to-maturity securities - at amortized cost:
U.S. government notes$15,420 $15,214 
Total held-to-maturity securities$15,420 $15,214 
Total investment securities$91,528 $57,481 
Schedule of held-to-maturity securities by maturity
At December 31, 2025, the held-to-maturity securities were scheduled to mature as follows (in thousands):
Within one yearAfter one but within five yearsAfter five but within ten yearsAfter ten yearsTotal
U.S. government notes — at amortized cost$5,432 $9,988 $— $— $15,420 
U.S. government notes — at fair value$5,444 $10,076 $— $— $15,520