Regulatory Capital (Tables)

12 Months Ended

Dec. 31, 2015

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, 2015 and 2014 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, 2015
Total risk-based capital:
Consolidated	$	946,156	15.4	%	$	492,692	8.0	%	$	646,658	10.50	%	$	615,865	10.0	%
FIB	882,504		14.4		490,866		8.0		644,262		10.50		$	613,582	10.0
Tier 1 risk-based capital:
Consolidated	861,339		14.0		369,519		6.0		523,485		8.5		$	492,692	8.0
FIB	805,805		13.1		368,149		6.0		521,545		8.5		$	490,866	8.0
Common equity tier 1 risk-based capital:
Consolidated	781,339		12.7		383,040		4.5		595,840		7.0		$	400,312	6.5
FIB	805,805		13.1		381,730		4.5		593,802		7.0		$	398,829	6.5
Leverage capital ratio:
Consolidated	861,339		10.1		246,346		4.0		246,346		4.0		$	425,600	5.0
FIB	805,805		9.5		245,433		4.0		245,433		4.0		$	424,145	5.0

(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.

	Actual				Adequately Capitalized				Well Capitalized (1)
	Amount		Ratio		Amount		Ratio		Amount		Ratio
December 31, 2014
Total risk-based capital:
Consolidated	$	897,769	16.2	%	$	444,685	8.0	%	$	555,856	10.0	%
FIB	832,907		15.1		442,468		8.0		553,085		10.0
Tier 1 risk-based capital:
Consolidated	807,229		14.5		222,343		4.0		$	333,514	6.0
FIB	754,708		13.7		221,234		4.0		331,851		6.0
Leverage capital ratio:
Consolidated	807,229		9.6		335,897		4.0		$	419,871	5.0
FIB	754,708		9.1		330,006		4.0		412,507		5.0

(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.

On July 2, 2013, the Board of Governors of the Federal Reserve Bank issued a final rule implementing a revised regulatory capital framework for U.S. banks in accordance with the Basel III international accord and satisfying related mandates under the Dodd-Frank Wall Street Reform and Consumer Protection Act. The revised regulatory capital framework (the "Basel III Capital Rules") substantially revised the risk-based capital requirements applicable to bank holding companies and depository institutions by defining the components of capital and addressing other issues affecting the numerator in banking institutions’ regulatory capital ratios, addressing risk weights and other issues affecting the denominator in banking institutions’ regulatory capital ratios and replacing the existing risk-weighting approach with a more risk-sensitive approach. The Basel III Capital Rules became effective for the Company on January 1, 2015, subject to a phase-in period for certain provisions.