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Deposits (Tables) | 9 Months Ended
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Sep. 30, 2017
Deposits [Abstract] |
Deposits | The composition of deposits at September 30, 2017 and December 31, 2016 is shown below. Average balances represent year-to-date averages.
|  | September 30, 2017 |  | December 31, 2016
|  | Balance |  | Average Balance |  | Average Rate |  | Balance |  | Average Balance |  | Average Rate
|  | (Dollars in Thousands)
Non-interest-bearing transaction accounts |  | $ | 253,320 |  |  | $ | 228,231 |  |  | — | % |  | $ | 252,638 |  |  | $ | 246,182 |  |  | — | %
Interest-bearing transaction accounts |  | 251,355 |  |  | 221,526 |  |  | 0.53 |  |  | 183,992 |  |  | 169,571 |  |  | 0.27 |
Money market accounts |  | 527,705 |  |  | 601,455 |  |  | 0.45 |  |  | 627,090 |  |  | 642,784 |  |  | 0.48 |
Certificates of deposit |  | 58,144 |  |  | 55,888 |  |  | 0.98 |  |  | 58,454 |  |  | 65,608 |  |  | 0.90 |
Wholesale deposits |  | 333,200 |  |  | 374,083 |  |  | 1.68 |  |  | 416,681 |  |  | 467,826 |  |  | 1.62 |
Total deposits |  | $ | 1,423,724 |  |  | $ | 1,481,183 |  |  | 0.72 |  |  | $ | 1,538,855 |  |  | $ | 1,591,971 |  |  | 0.74 |

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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_
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Balance Type: | na
Period Type: | duration