XML 79 R69.htm IDEA: XBRL DOCUMENT
v3.20.2

Deposits (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Deposits |  |
Deposits | $ 1,821,375 | $ 1,530,379
Average balance, deposits | $ 1,660,372 | $ 1,496,430
Deposits, weighted average interest rate during the period | 0.62% | 1.53%
Non-interest-bearing transaction accounts |  |
Deposits |  |
Deposits | $ 452,268 | $ 293,573
Average balance, deposits | $ 392,455 | $ 275,495
Deposits, weighted average interest rate during the period | 0.00% | 0.00%
Interest-bearing transaction accounts |  |
Deposits |  |
Deposits | $ 484,761 | $ 273,909
Average balance, deposits | $ 362,326 | $ 222,244
Deposits, weighted average interest rate during the period | 0.44% | 1.53%
Money market accounts |  |
Deposits |  |
Deposits | $ 636,872 | $ 674,409
Average balance, deposits | $ 649,999 | $ 617,341
Deposits, weighted average interest rate during the period | 0.52% | 1.71%
Certificates of deposit |  |
Deposits |  |
Deposits | $ 93,344 | $ 137,012
Average balance, deposits | $ 122,781 | $ 156,048
Deposits, weighted average interest rate during the period | 2.05% | 2.47%
Wholesale deposits |  |
Deposits |  |
Deposits | $ 154,130 | $ 151,476
Average balance, deposits | $ 132,811 | $ 225,302
Deposits, weighted average interest rate during the period | 2.03% | 2.27%

X
- Definition Average Balance, Deposits + References No definition available. + Details
Name: | fbiz_AverageBalanceDeposits
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition [Line Items] for Deposit [Table] + References No definition available. + Details
Name: | fbiz_DepositLineItems
Namespace Prefix: | fbiz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Deposits, Weighted Average Interest Rate During the Period + References No definition available. + Details
Name: | fbiz_DepositsWeightedAverageInterestRateDuringthePeriod
Namespace Prefix: | fbiz_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
Name: | us-gaap_Deposits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | fbiz_DepositTypeAxis=fbiz_NoninterestbearingTransactionAccountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | fbiz_DepositTypeAxis=fbiz_InterestbearingTransactionAccountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | fbiz_DepositTypeAxis=fbiz_MoneyMarketAccountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | fbiz_DepositTypeAxis=fbiz_NonbrokeredCertificatesofDepositMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | fbiz_DepositTypeAxis=fbiz_BrokeredCertificatesofDepositMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |