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Regulatory Capital (Tables)
6 Months Ended
Jun. 30, 2021
Banking and Thrift, Other Disclosures [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations Actual capital amounts and ratios for the Company and its subsidiary Bank, as of June 30, 2021 and December 31, 2020 are presented in the following tables: 
 ActualMinimum Required for Capital Adequacy PurposesFor Capital Adequacy Purposes Plus Capital Conservation BufferMinimum to Be Well Capitalized Under Prompt Corrective Action Requirements(1)
June 30, 2021Amount RatioAmount RatioAmount RatioAmount Ratio
Total risk-based capital:        
Consolidated$1,615.5 13.89 %$930.3 8.00 %$1,221.0 10.50 %$1,162.8 10.00 %
FIB1,445.4 12.47 927.5 8.00 1,217.4 10.50 1,159.4 10.00 
Tier 1 risk-based capital:
Consolidated1,415.6 12.17 697.7 6.00 988.4 8.50 930.3 8.00 
FIB1,345.5 11.60 695.7 6.00 985.5 8.50 927.5 8.00 
Common equity tier 1 risk-based capital:
Consolidated1,331.5 11.45 523.3 4.50 814.0 7.00 755.8 6.50 
FIB1,345.5 11.60 521.7 4.50 811.6 7.00 753.6 6.50 
Leverage capital ratio:
Consolidated1,415.6 7.84 722.0 4.00 722.0 4.00 902.5 5.00 
FIB1,345.5 7.47 720.2 4.00 720.2 4.00 900.3 5.00 

 ActualMinimum Required for Capital Adequacy PurposesFor Capital Adequacy Purposes Plus Capital Conservation BufferMinimum to Be Well Capitalized Under Prompt Corrective Action Requirements(1)
December 31, 2020Amount RatioAmount RatioAmount RatioAmount Ratio
Total risk-based capital:        
Consolidated$1,575.7 14.19 %$888.3 8.00 %$1,165.8 10.50 %$1,110.3 10.00 %
FIB1,426.8 12.89 885.6 8.00 1,162.3 10.50 1,107.0 10.00 
Tier 1 risk-based capital:
Consolidated1,369.0 12.33 666.2 6.00 943.8 8.50 888.3 8.00 
FIB1,320.1 11.93 664.2 6.00 940.9 8.50 885.6 8.00 
Common equity tier 1 risk-based capital:
Consolidated1,284.9 11.57 499.6 4.50 777.2 7.00 721.7 6.50 
FIB1,320.1 11.93 498.1 4.50 774.9 7.00 719.5 6.50 
Leverage capital ratio:
Consolidated1,369.0 8.16 671.0 4.00 671.0 4.00 838.7 5.00 
FIB1,320.1 7.88 669.7 4.00 669.7 4.00 837.2 5.00 
(1) The ratios for the requirements to be deemed “well-capitalized” are only applicable to FIB. However, the Company manages its capital position as if the requirements apply to the consolidated company and has presented the ratios as if they also applied on a consolidated basis.