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Securities - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
USD ($)
security
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
security
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
security
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Schedule of Available-for-sale Securities [Line Items]                
Number of securities in unrealized loss positions | security 2,025,000   2,025,000   2,115,000      
Unrealized loss positions $ 1,800,000   $ 1,800,000   $ 1,800,000      
Percentage of portfolio     86.00%   86.00%      
Fair value of nonaccrual status 2,900   $ 2,900          
Allowance for credit losses for available for sale debt securities 150 $ 0 150 $ 0 $ 0 $ 0 $ 0 $ 0
Credit loss expense (benefit) (150) 0 (150) 0        
Allowance for credit loss (142) $ (158) (142) $ (158) (158) $ (140) $ (158) $ (157)
Investment securities, held to maturity 1,819,229   1,819,229   1,867,848      
Accrued interest receivable on available for sale debt securities 12,500   12,500   12,700      
Tax benefit from the sale of securities available for sale     100          
State and municipal                
Schedule of Available-for-sale Securities [Line Items]                
Allowance for credit losses for available for sale debt securities 0   0   0      
Investment securities, held to maturity 1,023,861   1,023,861   1,048,862      
State and municipal | Internally-Assigned Rating Methodology                
Schedule of Available-for-sale Securities [Line Items]                
Investment securities, held to maturity $ 109,900   $ 109,900   $ 125,000