Regulatory Capital (Tables)

12 Months Ended

Dec. 31, 2018

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, 2018 and 2017 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, 2018
Total risk-based capital:
Consolidated	$	1,285.0	12.99	%	$	976.6	9.875	%	$	1,038.4	10.50	%	$	989.0	10.00	%
FIB	1,184.5		12.01		973.7		9.875		1,035.3		10.50		986.0		10.00
Tier 1 risk-based capital:
Consolidated	1,212.0		12.26		778.8		7.875		840.6		8.50		791.2		8.00
FIB	1,111.6		11.27		776.5		7.875		838.1		8.50		788.8		8.00
Common equity tier 1 risk-based capital:
Consolidated	1,127.8		11.40		630.5		6.375		692.3		7.00		642.8		6.50
FIB	1,111.6		11.27		628.6		6.375		690.2		7.00		640.9		6.50
Leverage capital ratio:
Consolidated	1,212.0		9.47		511.9		4.00		511.9		4.00		639.9		5.00
FIB	1,111.6		8.97		495.9		4.00		495.9		4.00		619.8		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, 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

(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.