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Capital Resources (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2008 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2012 | Dec. 31, 2010
Shareholders' Equity Disclosure [Line Items] |  |  |  |  |  |
Capital conservation buffer |  | 2.50% |  |  |  |
Minimum Common Equity Tier 1 ratio |  | 7.00% |  |  |  |
Minimum Tier 1 Risk-Based Capital ratio |  | 8.50% |  |  |  |
Minimum Total Capital ratio |  | 10.50% |  |  |  |
Capital conservation buffer future yearly increase, percentage |  | 0.625% |  |  |  |
Dividends available for distribution |  | $ 69,669 |  |  |  |
Stock repurchased during period, shares |  | 15,381 | 656 | 327 |  |
Stock repurchased during period, value |  | $ 497 | $ 24 | $ 8 |  |
Stock Repurchase Plan [Member] |  |  |  |  |  |
Shareholders' Equity Disclosure [Line Items] |  |  |  |  |  |
Number of shares approved for repurchase | 450,000 |  |  |  |  |
Stock repurchase program, percentage | 10.20% |  |  |  |  |
Stock repurchase program, authorized durational period | 24 months |  |  |  |  |
Stock repurchase program, authorized additional durational period |  |  |  | 24 months | 24 months | 24 months
Stock repurchased during period, shares |  | 173,794 | 158,413 |  |  |
Stock repurchased during period, value |  | $ 3,465 | $ 2,968 |  |  |
Treasury stock acquired, average cost per share |  | $ 19.94 | $ 18.74 |  |  |
Stock Repurchase Plan Current Year Repurchases [Member] |  |  |  |  |  |
Shareholders' Equity Disclosure [Line Items] |  |  |  |  |  |
Stock repurchased during period, shares |  | 15,381 | 656 |  |  |
Stock repurchased during period, value |  | $ 497 |  |  |  |
Treasury stock acquired, average cost per share |  | $ 32.30 |  |  |  |

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