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Capital Ratios and Shareholders' Equity - Components of Unrealized Holding Gains on AFS Securities - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrealized gains (losses) arising during the period $ 5,030 $ 13,081 $ 13,923 $ 10,858
Tax effect [1] (1,052) (2,724) (2,977) (2,241)
Unrealized gains on AFS securities, net of tax 3,978 10,357 10,946 8,617
Auction Rate Money Market Preferred        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrealized gains (losses) arising during the period (64) 109 (279) 186
Tax effect 0 0 0 0
Unrealized gains on AFS securities, net of tax (64) 109 (279) 186
All Other AFS Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrealized gains (losses) arising during the period 5,094 12,972 14,202 10,672
Tax effect (1,052) (2,724) (2,977) (2,241)
Unrealized gains on AFS securities, net of tax $ 4,042 $ 10,248 $ 11,225 $ 8,431
[1] See “Note 6 – Capital Ratios and Shareholders' Equity” of these consolidated financial statements for tax effect reconciliation.