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Business Combinations, Goodwill and Intangible Assets (Schedule of Acquired Intangible Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Business Acquisition [Line Items] |  |
Gross Amount | $ 26,896 | $ 17,282
Accumulated Amortization | (16,934) | (15,180)
Core Banking | Core Deposit Intangible |  |
Business Acquisition [Line Items] |  |
Gross Amount | 21,231 | 11,617
Accumulated Amortization | (11,418) | (9,694)
Core Banking | Branch Acquisition Intangible |  |
Business Acquisition [Line Items] |  |
Gross Amount | 257 | 257
Accumulated Amortization | (257) | (257)
Insurance | Customer List |  |
Business Acquisition [Line Items] |  |
Gross Amount | 5,408 | 5,408
Accumulated Amortization | $ (5,259) | $ (5,229)

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