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v3.19.1

Deposits (Tables) | 3 Months Ended
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Mar. 31, 2019
Deposits [Abstract] |
Deposits | The composition of deposits is shown below. Average balances represent year to date averages.
|  | March 31, 2019 |  | December 31, 2018
|  | Balance |  | Average Balance |  | Average Rate |  | Balance |  | Average Balance |  | Average Rate
|  | (Dollars in Thousands)
Non-interest-bearing transaction accounts |  | $ | 286,345 |  |  | $ | 257,222 |  |  | — | % |  | $ | 280,769 |  |  | $ | 241,529 |  |  | — | %
Interest-bearing transaction accounts |  | 206,360 |  |  | 215,400 |  |  | 1.62 |  |  | 229,612 |  |  | 269,943 |  |  | 0.99 |
Money market accounts |  | 579,539 |  |  | 555,692 |  |  | 1.82 |  |  | 516,045 |  |  | 491,756 |  |  | 1.09 |
Certificates of deposit |  | 167,250 |  |  | 159,600 |  |  | 2.40 |  |  | 153,022 |  |  | 94,172 |  |  | 1.70 |
Wholesale deposits |  | 262,212 |  |  | 267,791 |  |  | 2.16 |  |  | 275,851 |  |  | 302,440 |  |  | 1.95 |
Total deposits |  | $ | 1,501,706 |  |  | $ | 1,455,705 |  |  | 1.59 |  |  | $ | 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