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Fair Value (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 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 $ (79,000) $ 233,000 $ (159,000) $ 330,000  
Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair value of securities held 1,696,225,000   1,696,225,000   $ 1,217,852,000
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 833,453,000   833,453,000   581,247,000
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   0   497,000
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   0   $ 497,000
Losses from changes in fair value included in other comprehensive income $ 0 $ (3,000) $ (2,000) $ (26,000)