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Fair Value (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Loans Held-for-sale      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
(Losses)/gains from changes in fair value included in earnings $ (47) $ 5  
Fair Value, Measurements, Recurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of securities held 1,385,873   $ 1,217,852
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 623,848   581,247
Significant Unobservable  Inputs (Level 3) | Fair Value, Measurements, Recurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Fair value of securities held 0   497
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 0   $ 497
(Losses) from changes in fair value included in other comprehensive income $ (2) $ (16)