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Acquisitions (Narrative) (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 06, 2015 USD ($) store | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Business Acquisition [Line Items] |  |  |  |
Property, plant and equipment, gross |  | $ 160,401 | $ 158,530 |
Deposits |  | 3,231,653 | 3,083,975 |
Goodwill, acquired during period |  | 76,196 | 76,256 | $ 71,401
Merger-related costs |  | $ 0 | $ 598 | $ 0
AFB |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches acquired | store | 3 |  |  |
Business combination, premium on non-time deposits ($s) | $ 5,200 |  |  |
Business combination, premium on loans ($s) | $ 1,200 |  |  |
Business combination, premium on non-time deposits (%) | 5.50% |  |  |
Business combination, average days for premium calculation | 20 |  |  |
Business combination, premium on loans (%) | 1.00% |  |  |
Property, plant and equipment, gross | $ 4,000 |  |  |
Carry value of loans at acquisition date | 119,242 |  |  |
Deposits | 145,000 |  |  |
Premium on time deposits | 100 |  |  |
Premium on time deposits amortization period |  | 3 years |  |
Core deposit intangible | 1,400 |  |  |
Amortization time period for core deposit intangible assets |  | 10 years |  |
Goodwill, acquired during period | $ 6,800 |  |  |
Merger-related costs |  | $ 600 |  |

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