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Deposits (Tables) | 6 Months Ended
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Jun. 30, 2019
Deposits [Abstract] |
Deposits | The composition of deposits is shown below. Average balances represent year to date averages.
|  | June 30, 2019 |  | December 31, 2018
|  | Balance |  | Average Balance |  | Average Rate |  | Balance |  | Average Balance |  | Average Rate
|  | (Dollars in Thousands)
Non-interest-bearing transaction accounts |  | $ | 301,914 |  |  | $ | 255,691 |  |  | — | % |  | $ | 280,769 |  |  | $ | 241,529 |  |  | — | %
Interest-bearing transaction accounts |  | 244,608 |  |  | 224,873 |  |  | 1.65 |  |  | 229,612 |  |  | 269,943 |  |  | 0.99 |
Money market accounts |  | 596,520 |  |  | 574,666 |  |  | 1.87 |  |  | 516,045 |  |  | 491,756 |  |  | 1.09 |
Certificates of deposit |  | 147,216 |  |  | 162,082 |  |  | 2.45 |  |  | 153,022 |  |  | 94,172 |  |  | 1.70 |
Wholesale deposits |  | 239,387 |  |  | 259,379 |  |  | 2.19 |  |  | 275,851 |  |  | 302,440 |  |  | 1.95 |
Total deposits |  | $ | 1,529,645 |  |  | $ | 1,476,691 |  |  | 1.63 |  |  | $ | 1,455,299 |  |  | $ | 1,399,840 |  |  | 1.11 |

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

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- References No definition available. + Details
Name: | us-gaap_DepositsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration