Regulatory Capital

6 Months Ended

Jun. 30, 2013

Banking and Thrift [Abstract]

Regulatory Capital

Regulatory Capital

The Company is subject to the regulatory capital requirements administered by federal banking regulators and the Federal Reserve. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company must meet specific capital guidelines that involve quantitative measures of the Company’s assets, liabilities and certain off-balance sheet items as calculated under regulatory accounting practices. Quantitative measures established by regulation to ensure capital adequacy require the Company to maintain minimum amounts and ratios of total and tier 1 capital to risk-weighted assets, and of tier 1 capital to average assets, as defined in the regulations. As of June 30, 2013 and December 31, 2012, the Company exceeded all capital adequacy requirements to which it is subject.

Actual capital amounts and ratios and selected minimum regulatory thresholds for the Company and its bank subsidiary, First Interstate Bank (“FIB”), as of June 30, 2013 and December 31, 2012 are presented in the following tables:

	Actual				Adequately Capitalized				Well Capitalized
	Amount		Ratio		Amount		Ratio		Amount		Ratio
June 30, 2013
Total risk-based capital:
Consolidated	$	788,109	16.3	%	$	387,029	8.0	%	NA		NA
FIB	715,684		14.9		384,810		8.0		$	481,012	10.0	%
Tier 1 risk-based capital:
Consolidated	699,166		14.5		193,515		4.0		NA		NA
FIB	643,083		13.4		192,405		4.0		$	288,607	6.0
Leverage capital ratio:
Consolidated	699,166		9.7		287,443		4.0		NA		NA
FIB	643,083		9.0		286,562		4.0		$	358,203	5.0

	Actual				Adequately Capitalized				Well Capitalized
	Amount		Ratio		Amount		Ratio		Amount		Ratio
December 31, 2012
Total risk-based capital:
Consolidated	$	748,431	15.6	%	$	384,014	8.0	%	NA		NA
FIB	697,695		14.6		382,245		8.0		$	477,806	10.0	%
Tier 1 risk-based capital:
Consolidated	652,929		13.6		192,007		4.0		NA		NA
FIB	622,466		13.0		191,122		4.0		$	286,683	6.0
Leverage capital ratio:
Consolidated	652,929		8.8		296,559		4.0		NA		NA
FIB	622,466		8.4		296,061		4.0		$	370,077	5.0