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Fair Value - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Fair Value, Measurements, Recurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of securities held $ 1,539,270   $ 1,596,832
Significant Unobservable  Inputs (Level 3) | Fair Value, Measurements, Recurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of securities held 1,067   1,059
Loans Held-for-sale      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
(Losses)/gains from changes in fair value included in earnings 88 $ (29)  
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 688,760   768,875
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 76   75
MBS/CMO | Fair Value, Measurements, Recurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of securities held 623,016   645,040
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 991   $ 984
Losses from other changes in fair value included in other comprehensive income $ 8 $ 11