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Regulatory Capital (Details)
$ in Millions
Jan. 01, 2020
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Retained Earnings (Accumulated Deficit)   $ 1,026.9 $ 962.1
Total risk-based capital:      
Actual, Amount   $ 1,642.0 $ 1,575.7
Actual, Ratio   0.1400 0.1419
Minimum Required for Capital Adequacy Purposes, Amount   $ 938.0 $ 888.3
Minimum Required for Capital Adequacy Purposes, Ratio   0.0800 0.0800
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Amount   $ 1,231.1 $ 1,165.8
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Ratio   10.50% 10.50%
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount   $ 1,172.5 $ 1,110.3
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio   0.1000 0.1000
Tier 1 risk-based capital:      
Actual, Amount   $ 1,442.6 $ 1,369.0
Actual, Ratio   0.1230 0.1233
Minimum Required for Capital Adequacy Purposes, Amount   $ 703.5 $ 666.2
Minimum Required for Capital Adequacy Purposes, Ratio   0.0600 0.0600
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Amount   $ 996.6 $ 943.8
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Ratio   8.50% 8.50%
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount   $ 938.0 $ 888.3
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio   0.0800 0.0800
Common equity tier 1 risk-based capital:      
Actual, Amount   $ 1,358.5 $ 1,284.9
Actual, Ratio   11.59% 11.57%
Minimum Required for Capital Adequacy Purposes, Amount   $ 527.6 $ 499.6
Minimum Required for Capital Adequacy Purposes, Ratio   4.50% 4.50%
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Amount   $ 820.7 $ 777.2
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Ratio   7.00% 7.00%
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount   $ 762.1 $ 721.7
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio   6.50% 6.50%
Leverage capital ratio:      
Actual, Amount   $ 1,442.6 $ 1,369.0
Actual, Ratio   0.0781 0.0816
Banking Regulation, Tier One Leverage Capital, Capital Adequacy, Minimum   $ 738.5 $ 671.0
Capital Adequacy Purposes and Conservation Buffer, Ratio   0.0400 0.0400
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount   $ 923.1 $ 838.7
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio   0.0500 0.0500
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle $ 24.1    
FIB      
Total risk-based capital:      
Actual, Amount   $ 1,464.8 $ 1,426.8
Actual, Ratio   0.1253 0.1289
Minimum Required for Capital Adequacy Purposes, Amount   $ 935.1 $ 885.6
Minimum Required for Capital Adequacy Purposes, Ratio   0.0800 0.0800
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Amount   $ 1,227.3 $ 1,162.3
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Ratio   10.50% 10.50%
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount   $ 1,168.9 $ 1,107.0
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio   0.1000 0.1000
Tier 1 risk-based capital:      
Actual, Amount   $ 1,365.4 $ 1,320.1
Actual, Ratio   0.1168 0.1193
Minimum Required for Capital Adequacy Purposes, Amount   $ 701.3 $ 664.2
Minimum Required for Capital Adequacy Purposes, Ratio   0.0600 0.0600
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Amount   $ 993.5 $ 940.9
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Ratio   8.50% 8.50%
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount   $ 935.1 $ 885.6
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio   0.0800 0.0800
Common equity tier 1 risk-based capital:      
Actual, Amount   $ 1,365.4 $ 1,320.1
Actual, Ratio   11.68% 11.93%
Minimum Required for Capital Adequacy Purposes, Amount   $ 526.0 $ 498.1
Minimum Required for Capital Adequacy Purposes, Ratio   4.50% 4.50%
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Amount   $ 818.2 $ 774.9
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Ratio   7.00% 7.00%
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount   $ 759.8 $ 719.5
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio   6.50% 6.50%
Leverage capital ratio:      
Actual, Amount   $ 1,365.4 $ 1,320.1
Actual, Ratio   0.0741 0.0788
Banking Regulation, Tier One Leverage Capital, Capital Adequacy, Minimum   $ 737.2 $ 669.7
Capital Adequacy Purposes and Conservation Buffer, Ratio   0.0400 0.0400
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount   $ 921.5 $ 837.2
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio   0.0500 0.0500