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Securities (Schedule of Securities with Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months Fair Value | $ 669,283 | $ 89,337
Less than 12 Months Unrealized Loss | (14,705) | (326)
12 Months or More Fair Value | 0 | 0
12 Months or More Unrealized Loss | 0 | 0
Total Fair Value | 669,283 | 89,337
Total Unrealized Loss | (14,705) | (326)
Obligations of State and Political Subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months Fair Value | 155,320 | 10,652
Less than 12 Months Unrealized Loss | (2,547) | (103)
12 Months or More Fair Value | 0 | 0
12 Months or More Unrealized Loss | 0 | 0
Total Fair Value | 155,320 | 10,652
Total Unrealized Loss | (2,547) | (103)
MBS/CMO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months Fair Value | 405,387 | 19,631
Less than 12 Months Unrealized Loss | (8,871) | (25)
12 Months or More Fair Value | 0 | 0
12 Months or More Unrealized Loss | 0 | 0
Total Fair Value | 405,387 | 19,631
Total Unrealized Loss | (8,871) | (25)
US Gov't Sponsored Entities & Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months Fair Value | 108,576 | 59,054
Less than 12 Months Unrealized Loss | (3,287) | (198)
12 Months or More Fair Value | 0 | 0
12 Months or More Unrealized Loss | 0 | 0
Total Fair Value | 108,576 | 59,054
Total Unrealized Loss | $ (3,287) | $ (198)

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