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Regulatory Capital (Tables) | 12 Months Ended
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Dec. 31, 2017
Banking and Thrift [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations | The Company’s actual capital amounts and ratios and selected minimum regulatory thresholds and prompt corrective action provisions as of December 31, 2017 and 2016 are presented in the following tables:
| Actual |  | Adequately Capitalized Basel III Phase-In Schedule |  | Adequately Capitalized Basel III Fully Phased-In |  | Well Capitalized (1)
| Amount | Ratio |  | Amount | Ratio |  | Amount | Ratio |  | Amount | Ratio
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Total risk-based capital: |  |  |  |  |  |  |  |  |  |  |
Consolidated | $ | 1,112.5 |  | 12.76 | % |  | $ | 806.5 |  | 9.25 | % |  | $ | 915.5 |  | 10.50 | % |  | $ | 871.9 |  | 10.00 | %
FIB | 1,066.6 |  | 12.29 |  |  | 802.7 |  | 9.25 |  |  | 911.2 |  | 10.50 |  |  | 867.8 |  | 10.00 |
Tier 1 risk-based capital: |  |  |  |  |  |  |  |  |  |  |
Consolidated | 1,040.3 |  | 11.93 |  |  | 632.1 |  | 7.25 |  |  | 741.1 |  | 8.50 |  |  | 697.5 |  | 8.00 |
FIB | 994.4 |  | 11.46 |  |  | 629.1 |  | 7.25 |  |  | 737.6 |  | 8.50 |  |  | 694.2 |  | 8.00 |
Common equity tier 1 risk-based capital: |  |  |  |  |  |  |  |  |  |  |
Consolidated | 962.4 |  | 11.04 |  |  | 501.3 |  | 5.75 |  |  | 610.3 |  | 7.00 |  |  | 566.7 |  | 6.50 |
FIB | 994.4 |  | 11.46 |  |  | 499.0 |  | 5.75 |  |  | 607.4 |  | 7.00 |  |  | 564.1 |  | 6.50 |
Leverage capital ratio: |  |  |  |  |  |  |  |  |  |  |
Consolidated | 1,040.3 |  | 8.86 |  |  | 469.9 |  | 4.00 |  |  | 469.9 |  | 4.00 |  |  | 587.4 |  | 5.00 |
FIB | 994.4 |  | 8.48 |  |  | 469.1 |  | 4.00 |  |  | 469.1 |  | 4.00 |  |  | 586.3 |  | 5.00 |
| Actual |  | Adequately Capitalized Basel III Phase-In Schedule |  | Adequately Capitalized Basel III Fully Phased-In |  | Well Capitalized (1)
| Amount | Ratio |  | Amount | Ratio |  | Amount | Ratio |  | Amount | Ratio
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |
Total risk-based capital: |  |  |  |  |  |  |  |  |  |  |
Consolidated | $ | 974.5 |  | 15.13 | % |  | $ | 555.7 |  | 8.63 | % |  | $ | 676.1 |  | 10.50 | % |  | $ | 643.9 |  | 10.00 | %
FIB | 842.0 |  | 13.13 |  |  | 553.5 |  | 8.63 |  |  | 673.4 |  | 10.50 |  |  | 641.3 |  | 10.00 |
Tier 1 risk-based capital: |  |  |  |  |  |  |  |  |  |  |
Consolidated | 894.3 |  | 13.89 |  |  | 426.9 |  | 6.63 |  |  | 547.3 |  | 8.50 |  |  | 515.1 |  | 8.00 |
FIB | 765.8 |  | 11.94 |  |  | 425.2 |  | 6.63 |  |  | 545.1 |  | 8.50 |  |  | 513.1 |  | 8.00 |
Common equity tier 1 risk-based capital: |  |  |  |  |  |  |  |  |  |  |
Consolidated | 814.3 |  | 12.65 |  |  | 330.3 |  | 5.13 |  |  | 450.7 |  | 7.00 |  |  | 418.5 |  | 6.50 |
FIB | 765.8 |  | 11.94 |  |  | 329.0 |  | 5.13 |  |  | 448.9 |  | 7.00 |  |  | 416.9 |  | 6.50 |
Leverage capital ratio: |  |  |  |  |  |  |  |  |  |  |
Consolidated | 894.3 |  | 10.11 |  |  | 353.8 |  | 4.00 |  |  | 353.8 |  | 4.00 |  |  | 442.3 |  | 5.00 |
FIB | 765.8 |  | 8.69 |  |  | 352.3 |  | 4.00 |  |  | 352.3 |  | 4.00 |  |  | 440.4 |  | 5.00 |
(1) The ratios for the well capitalized requirement are only applicable to FIB. However, the Company manages its capital position as if the requirement applies to the consolidated entity and has presented the ratios as if they also applied on a consolidated basis.

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958577-112826 + Details
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