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v3.20.1

Deposits (Tables) | 3 Months Ended
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Mar. 31, 2020
Deposits [Abstract] |
Deposits | The composition of deposits is shown below. Average balances represent year to date averages.
|  | March 31, 2020 |  | December 31, 2019
|  | Balance |  | Average Balance |  | Average Rate |  | Balance |  | Average Balance |  | Average Rate
|  | (Dollars in Thousands)
Non-interest-bearing transaction accounts |  | $ | 301,657 |  |  | $ | 291,178 |  |  | — | % |  | $ | 293,573 |  |  | $ | 275,495 |  |  | — | %
Interest-bearing transaction accounts |  | 343,064 |  |  | 271,531 |  |  | 0.95 |  |  | 273,909 |  |  | 222,244 |  |  | 1.53 |
Money market accounts |  | 609,883 |  |  | 669,482 |  |  | 1.12 |  |  | 674,409 |  |  | 617,341 |  |  | 1.71 |
Certificates of deposit |  | 128,695 |  |  | 134,000 |  |  | 2.24 |  |  | 137,012 |  |  | 156,048 |  |  | 2.47 |
Wholesale deposits |  | 116,827 |  |  | 132,468 |  |  | 2.57 |  |  | 151,476 |  |  | 225,302 |  |  | 2.27 |
Total deposits |  | $ | 1,500,126 |  |  | $ | 1,498,659 |  |  | 1.10 |  |  | $ | 1,530,379 |  |  | $ | 1,496,430 |  |  | 1.53 |

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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