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v3.20.2

Deposits (Tables) | 6 Months Ended
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Jun. 30, 2020
Deposits [Abstract] |
Deposits | The composition of deposits is shown below. Average balances represent year to date averages.
|  | June 30, 2020 |  | December 31, 2019
|  | Balance |  | Average Balance |  | Average Rate |  | Balance |  | Average Balance |  | Average Rate
|  | (Dollars in Thousands)
Non-interest-bearing transaction accounts |  | $ | 433,760 |  |  | $ | 365,771 |  |  | — | % |  | $ | 293,573 |  |  | $ | 275,495 |  |  | — | %
Interest-bearing transaction accounts |  | 413,214 |  |  | 320,188 |  |  | 0.59 |  |  | 273,909 |  |  | 222,244 |  |  | 1.53 |
Money market accounts |  | 656,741 |  |  | 653,598 |  |  | 0.68 |  |  | 674,409 |  |  | 617,341 |  |  | 1.71 |
Certificates of deposit |  | 116,901 |  |  | 128,791 |  |  | 2.14 |  |  | 137,012 |  |  | 156,048 |  |  | 2.47 |
Wholesale deposits |  | 89,759 |  |  | 119,032 |  |  | 2.50 |  |  | 151,476 |  |  | 225,302 |  |  | 2.27 |
Total deposits |  | $ | 1,710,375 |  |  | $ | 1,587,380 |  |  | 0.76 |  |  | $ | 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