v3.26.1
Investment Securities - Additional Information (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
position
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
position
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
position
Investments, Debt and Equity Securities [Abstract]          
Equity securities $ 88,541,000   $ 88,541,000   $ 82,774,000
Trading debt securities 26,493,000   26,493,000   0
Accrued interest on investments available for sale $ 18,900,000   $ 18,900,000   $ 18,200,000
Number of security positions in the debt securities available for sale portfolio in an unrealized loss position | position 680   680   602
Fair value of debt securities available for sale pledged as collateral $ 1,000,000,000.0   $ 1,000,000,000.0    
Weighted-average remaining expected life of residential mortgage-backed securities available for sale, years     5 years 5 months 26 days    
Impairment loss 0 $ 0 $ 0 $ 0  
Allowance for credit losses for available for sale debt securities 0   0   $ 0
Accrued interest on securities held to maturity $ 13,200,000   $ 13,200,000   $ 12,300,000
Number of security positions in the securities held to maturity portfolio in an unrealized loss position | position 672   672   667
Fair value of investments held to maturity pledged as collateral $ 836,800,000   $ 836,800,000    
Weighted-average remaining expected life of residential mortgage-backed securities held to maturity, years     8 years 10 months 6 days    
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Accrued interest receivable   Accrued interest receivable   Accrued interest receivable
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Accrued interest receivable   Accrued interest receivable   Accrued interest receivable