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Fair Value - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair value of securities held $ 1,476,956   $ 1,476,956   $ 1,761,669
Significant Unobservable  Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair value of securities held 1,025   1,025   989
Loans Held-for-sale          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
(Losses)/gains from changes in fair value included in earnings (44) $ (4) (14) $ (140)  
Obligations of State and Political Subdivisions | Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair value of securities held 679,187   679,187   777,852
Obligations of State and Political Subdivisions | Significant Unobservable  Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair value of securities held 82   82   83
MBS/CMO | Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair value of securities held 620,563   620,563   714,681
MBS/CMO | Significant Unobservable  Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair value of securities held 943   943   $ 906
Losses from other changes in fair value included in other comprehensive income $ 22 $ (3) $ 36 $ (3)