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Fair Value - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Loans Held-for-sale          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
(Losses)/gains from changes in fair value included in earnings $ 59 $ (94) $ 30 $ (135)  
Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair value of securities held 1,600,709   1,600,709   $ 1,761,669
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 747,306   747,306   777,852
Fair Value, Measurements, Recurring | MBS/CMO          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair value of securities held 665,869   665,869   714,681
Significant Unobservable  Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair value of securities held 1,003   1,003   989
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 84   84   83
Significant Unobservable  Inputs (Level 3) | Fair Value, Measurements, Recurring | MBS/CMO          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair value of securities held 919   919   $ 906
Losses from other changes in fair value included in other comprehensive income $ 3 $ 0 $ 14 $ 0