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Securities (Schedule of Securities with Unrealized Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months Fair Value | $ 904,976 | $ 89,337
Less than 12 Months Unrealized Loss | (17,449) | (326)
12 Months or More Fair Value | 1,761 | 0
12 Months or More Unrealized Loss | (146) | 0
Total Fair Value | 906,737 | 89,337
Total Unrealized Loss | (17,595) | (326)
Obligations of State and Political Subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months Fair Value | 303,113 | 10,652
Less than 12 Months Unrealized Loss | (5,917) | (103)
12 Months or More Fair Value | 1,452 | 0
12 Months or More Unrealized Loss | (143) | 0
Total Fair Value | 304,565 | 10,652
Total Unrealized Loss | (6,060) | (103)
MBS/CMO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months Fair Value | 475,726 | 19,631
Less than 12 Months Unrealized Loss | (8,404) | (25)
12 Months or More Fair Value | 309 | 0
12 Months or More Unrealized Loss | (3) | 0
Total Fair Value | 476,035 | 19,631
Total Unrealized Loss | (8,407) | (25)
US Gov't Sponsored Entities & Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months Fair Value | 126,137 | 59,054
Less than 12 Months Unrealized Loss | (3,128) | (198)
12 Months or More Fair Value | 0 | 0
12 Months or More Unrealized Loss | 0 | 0
Total Fair Value | 126,137 | 59,054
Total Unrealized Loss | $ (3,128) | $ (198)

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