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Regulatory Capital (Tables)
 12 Months Ended
Dec. 31, 2012
Banking and Thrift [Abstract]  
Capital adequacy guidelines and compliance
The following table illustrates the FRB’s adequacy guidelines and the Company’s and the Bank's compliance with those guidelines as of December 31, 2012:

 
Actual
 
Minimum Capital
Requirement
 
Well Capitalized
Requirement
(Dollars in thousands)
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio
Total capital (to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
Consolidated
923,574

 
20.09
%
 
367,701

 
8.00
%
 
459,627

 
10.00
%
Glacier Bank
851,819

 
18.79
%
 
362,711

 
8.00
%
 
453,388

 
10.00
%
Tier 1 capital (to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
Consolidated
865,213

 
18.82
%
 
183,851

 
4.00
%
 
275,776

 
6.00
%
Glacier Bank
794,228

 
17.52
%
 
181,355

 
4.00
%
 
272,033

 
6.00
%
Tier 1 capital (to average assets)
 
 
 
 
 
 
 
 
 
 
 
Consolidated
865,213

 
11.31
%
 
306,005

 
4.00
%
 
N/A

 
N/A

Glacier Bank
794,228

 
10.55
%
 
301,013

 
4.00
%
 
376,267

 
5.00
%
Note 12. Regulatory Capital (continued)

The following table illustrates the FRB’s adequacy guidelines and the Company’s and bank subsidiaries’ compliance with those guidelines as of December 31, 2011:

 
Actual
 
Minimum Capital
Requirement
 
Well Capitalized
Requirement
(Dollars in thousands)
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio
Total capital (to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
Consolidated
883,954

 
20.27
%
 
348,950

 
8.00
%
 
436,187

 
10.00
%
Glacier Bank
187,082

 
19.95
%
 
75,033

 
8.00
%
 
93,792

 
10.00
%
Mountain West Bank
149,280

 
20.42
%
 
58,474

 
8.00
%
 
73,092

 
10.00
%
First Security Bank of Missoula
121,181

 
17.18
%
 
56,414

 
8.00
%
 
70,517

 
10.00
%
Western Security Bank
69,646

 
17.07
%
 
32,632

 
8.00
%
 
40,790

 
10.00
%
1st Bank
68,729

 
19.48
%
 
28,225

 
8.00
%
 
35,282

 
10.00
%
Valley Bank of Helena
34,117

 
14.01
%
 
19,476

 
8.00
%
 
24,345

 
10.00
%
Big Sky Western Bank
68,661

 
25.43
%
 
21,601

 
8.00
%
 
27,002

 
10.00
%
First Bank of Wyoming
41,860

 
19.95
%
 
16,789

 
8.00
%
 
20,987

 
10.00
%
Citizens Community Bank
29,011

 
13.85
%
 
16,763

 
8.00
%
 
20,954

 
10.00
%
First Bank of Montana
22,757

 
15.05
%
 
12,100

 
8.00
%
 
15,124

 
10.00
%
Bank of the San Juans
21,127

 
13.63
%
 
12,402

 
8.00
%
 
15,503

 
10.00
%
Tier 1 capital (to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
Consolidated
828,404

 
18.99
%
 
174,475

 
4.00
%
 
261,712

 
6.00
%
Glacier Bank
175,066

 
18.67
%
 
37,517

 
4.00
%
 
56,275

 
6.00
%
Mountain West Bank
139,809

 
19.13
%
 
29,237

 
4.00
%
 
43,855

 
6.00
%
First Security Bank of Missoula
112,198

 
15.91
%
 
28,207

 
4.00
%
 
42,310

 
6.00
%
Western Security Bank
64,520

 
15.82
%
 
16,316

 
4.00
%
 
24,474

 
6.00
%
1st Bank
64,267

 
18.22
%
 
14,113

 
4.00
%
 
21,169

 
6.00
%
Valley Bank of Helena
31,059

 
12.76
%
 
9,738

 
4.00
%
 
14,607

 
6.00
%
Big Sky Western Bank
65,218

 
24.15
%
 
10,801

 
4.00
%
 
16,201

 
6.00
%
First Bank of Wyoming
39,670

 
18.90
%
 
8,395

 
4.00
%
 
12,592

 
6.00
%
Citizens Community Bank
26,358

 
12.58
%
 
8,382

 
4.00
%
 
12,572

 
6.00
%
First Bank of Montana
20,854

 
13.79
%
 
6,050

 
4.00
%
 
9,075

 
6.00
%
Bank of the San Juans
19,161

 
12.36
%
 
6,201

 
4.00
%
 
9,302

 
6.00
%
Tier 1 capital (to average assets)
 
 
 
 
 
 
 
 
 
 
 
Consolidated
828,404

 
11.81
%
 
280,602

 
4.00
%
 
N/A

 
N/A

Glacier Bank
175,066

 
13.00
%
 
53,846

 
4.00
%
 
67,308

 
5.00
%
Mountain West Bank
139,809

 
12.81
%
 
43,660

 
4.00
%
 
54,575

 
5.00
%
First Security Bank of Missoula
112,198

 
10.49
%
 
42,793

 
4.00
%
 
53,492

 
5.00
%
Western Security Bank
64,520

 
8.28
%
 
31,159

 
4.00
%
 
38,949

 
5.00
%
1st Bank
64,267

 
8.49
%
 
30,279

 
4.00
%
 
37,849

 
5.00
%
Valley Bank of Helena
31,059

 
6.94
%
 
17,906

 
4.00
%
 
22,382

 
5.00
%
Big Sky Western Bank
65,218

 
17.33
%
 
15,057

 
4.00
%
 
18,821

 
5.00
%
First Bank of Wyoming
39,670

 
10.40
%
 
15,264

 
4.00
%
 
19,080

 
5.00
%
Citizens Community Bank
26,358

 
7.65
%
 
13,783

 
4.00
%
 
17,228

 
5.00
%
First Bank of Montana
20,854

 
8.33
%
 
10,008

 
4.00
%
 
12,510

 
5.00
%
Bank of the San Juans
19,161

 
8.48
%
 
9,042

 
4.00
%
 
11,303

 
5.00
%