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Fair Value - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Loans Held-for-sale          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
(Losses)/gains from changes in fair value included in earnings $ (4) $ (79) $ (140) $ (159)  
Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair value of securities held 1,701,628   1,701,628   $ 1,889,617
Fair Value, Measurements, Recurring | Obligations of State and Political Subdivisions          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair value of securities held 771,993   771,993   925,706
Significant Unobservable  Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair value of securities held 91   91   0
Significant Unobservable  Inputs (Level 3) | Fair Value, Measurements, Recurring | Obligations of State and Political Subdivisions          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair value of securities held 91   91   $ 0
Losses from changes in fair value included in other comprehensive income $ (3) $ 0 $ (3) $ (2)