XML 76 R61.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Securities (Unrealized Losses Available-for-Sale) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Fair value |  |
Less than 12 months | $ 70,573 | $ 42,185
12 months or longer | 9,385 | 21,518
Total | 79,958 | 63,703
Unrealized losses |  |
Less than 12 months | 470 | 159
12 months or longer | 159 | 408
Total | 629 | 567
U.S. Government agency obligations - government-sponsored enterprises |  |
Fair value |  |
Less than 12 months | 3,536 | 3,486
12 months or longer | 1,981 | 5,479
Total | 5,517 | 8,965
Unrealized losses |  |
Less than 12 months | 13 | 12
12 months or longer | 19 | 69
Total | 32 | 81
Municipal obligations |  |
Fair value |  |
Less than 12 months | 2,403 | 0
12 months or longer | 0 | 0
Total | 2,403 | 0
Unrealized losses |  |
Less than 12 months | 7 | 0
12 months or longer | 0 | 0
Total | 7 | 0
Asset-backed securities |  |
Fair value |  |
Less than 12 months | 1,269 | 0
12 months or longer | 0 | 1,510
Total | 1,269 | 1,510
Unrealized losses |  |
Less than 12 months | 58 | 0
12 months or longer | 0 | 4
Total | 58 | 4
Collateralized mortgage obligations - government issued |  |
Fair value |  |
Less than 12 months | 3,373 | 9,201
12 months or longer | 5,687 | 9,536
Total | 9,060 | 18,737
Unrealized losses |  |
Less than 12 months | 19 | 50
12 months or longer | 97 | 206
Total | 116 | 256
Collateralized mortgage obligations - government-sponsored enterprises |  |
Fair value |  |
Less than 12 months | 59,992 | 29,498
12 months or longer | 1,717 | 4,993
Total | 61,709 | 34,491
Unrealized losses |  |
Less than 12 months | 373 | 97
12 months or longer | 43 | 129
Total | $ 416 | $ 226

X
- Definition Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss1 + References No definition available. + Details
Name: | fbiz_AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAggregateLoss1
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss1 + References No definition available. + Details
Name: | fbiz_AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLoss1
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss1 + References No definition available. + Details
Name: | fbiz_AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessthan12MonthsAggregateLoss1
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_NontaxableMunicipalBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |