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Regulatory Capital (Tables)
9 Months Ended
Sep. 30, 2024
Banking and Thrift, Other Disclosure [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 September 30, 2024 and December 31, 2023 are presented in the following tables: 
 ActualMinimum Required for Capital Adequacy Purposes
For Capital Adequacy Purposes Plus Capital Conservation Buffer(1)
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements(2)
September 30, 2024Amount RatioAmount RatioAmount RatioAmount Ratio
Total risk-based capital:        
Consolidated$2,976.2 14.11 %$1,687.2 8.00 %$2,214.4 10.50 %$2,109.0 10.00 %
FIB2,701.2 12.84 1,683.6 8.00 2,209.7 10.50 2,104.5 10.00 
Tier 1 risk-based capital:
Consolidated2,495.8 11.83 1,265.4 6.00 1,792.6 8.50 1,687.2 8.00 
FIB2,478.4 11.78 1,262.7 6.00 1,788.8 8.50 1,683.6 8.00 
Common equity tier 1 risk-based capital:
Consolidated2,495.8 11.83 949.0 4.50 1,476.3 7.00 1,370.8 6.50 
FIB2,478.4 11.78 947.0 4.50 1,473.1 7.00 1,367.9 6.50 
Leverage capital ratio:
Consolidated2,495.8 8.57 1,164.9 4.00 1,164.9 4.00 1,456.2 5.00 
FIB2,478.4 8.52 1,163.1 4.00 1,163.1 4.00 1,453.9 5.00 
 ActualMinimum Required for Capital Adequacy Purposes
For Capital Adequacy Purposes Plus Capital Conservation Buffer(1)
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements(2)
December 31, 2023Amount RatioAmount RatioAmount RatioAmount Ratio
Total risk-based capital:        
Consolidated$2,941.1 13.28 %$1,771.6 8.00 %$2,325.2 10.50 %$2,214.5 10.00 %
FIB2,662.0 12.04 1,768.3 8.00 2,320.8 10.50 2,210.3 10.00 
Tier 1 risk-based capital:
Consolidated2,454.4 11.08 1,328.7 6.00 1,882.3 8.50 1,771.6 8.00 
FIB2,433.0 11.01 1,326.2 6.00 1,878.8 8.50 1,768.3 8.00 
Common equity tier 1 risk-based capital:
Consolidated2,454.4 11.08 996.5 4.50 1,550.1 7.00 1,439.4 6.50 
FIB2,433.0 11.01 994.6 4.50 1,547.2 7.00 1,436.7 6.50 
Leverage capital ratio:
Consolidated2,454.4 8.22 1,193.9 4.00 1,193.9 4.00 1,492.3 5.00 
FIB2,433.0 8.16 1,192.2 4.00 1,192.2 4.00 1,490.2 5.00 
(1) The capital conservation buffer is an additional 2.5% of the amount necessary to meet the minimum risk-based capital requirements for total, tier 1, and common equity tier 1 risk-based capital.
(2) The ratios to meet 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.