XML 75 R65.htm IDEA: XBRL DOCUMENT
v3.19.1

Deposits (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Deposits [Line Items] |  |
Deposits | $ 1,501,706 | $ 1,455,299
Average balance, deposits | $ 1,455,705 | $ 1,399,840
Deposits, weighted average interest rate during the period | 1.59% | 1.11%
Non-interest-bearing transaction accounts |  |
Deposits [Line Items] |  |
Deposits | $ 286,345 | $ 280,769
Average balance, deposits | $ 257,222 | $ 241,529
Deposits, weighted average interest rate during the period | 0.00% | 0.00%
Interest-bearing transaction accounts |  |
Deposits [Line Items] |  |
Deposits | $ 206,360 | $ 229,612
Average balance, deposits | $ 215,400 | $ 269,943
Deposits, weighted average interest rate during the period | 1.62% | 0.99%
Money market accounts |  |
Deposits [Line Items] |  |
Deposits | $ 579,539 | $ 516,045
Average balance, deposits | $ 555,692 | $ 491,756
Deposits, weighted average interest rate during the period | 1.82% | 1.09%
Certificates of deposit |  |
Deposits [Line Items] |  |
Deposits | $ 167,250 | $ 153,022
Average balance, deposits | $ 159,600 | $ 94,172
Deposits, weighted average interest rate during the period | 2.40% | 1.70%
Wholesale deposits |  |
Deposits [Line Items] |  |
Deposits | $ 262,212 | $ 275,851
Average balance, deposits | $ 267,791 | $ 302,440
Deposits, weighted average interest rate during the period | 2.16% | 1.95%

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=6876686&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: |