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Deposits (Tables) | 6 Months Ended
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Jun. 30, 2016
Deposits [Abstract] |
Deposits | The composition of deposits at June 30, 2016 and December 31, 2015 is shown below. Average balances represent year-to-date averages.
|  | June 30, 2016 |  | December 31, 2015
|  | Balance |  | Average balance |  | Weighted average rate |  | Balance |  | Average balance |  | Weighted average rate
|  | (Dollars in Thousands)
Non-interest-bearing transaction accounts |  | $ | 243,370 |  |  | $ | 237,449 |  |  | — | % |  | $ | 231,199 |  |  | $ | 211,945 |  |  | — | %
Interest-bearing transaction accounts |  | 151,865 |  |  | 154,944 |  |  | 0.21 |  |  | 165,921 |  |  | 125,558 |  |  | 0.24 |
Money market accounts |  | 671,420 |  |  | 660,189 |  |  | 0.51 |  |  | 612,642 |  |  | 602,842 |  |  | 0.55 |
Certificates of deposit |  | 64,235 |  |  | 69,391 |  |  | 0.83 |  |  | 79,986 |  |  | 106,177 |  |  | 0.78 |
Wholesale deposits |  | 477,054 |  |  | 484,491 |  |  | 1.63 |  |  | 487,483 |  |  | 450,460 |  |  | 1.43 |
Total deposits |  | $ | 1,607,944 |  |  | $ | 1,606,464 |  |  | 0.76 |  |  | $ | 1,577,231 |  |  | $ | 1,496,982 |  |  | 0.73 |

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- Definition Deposits [Table Text Block] + References No definition available. + Details
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Namespace Prefix: | fbiz_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration