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Investments (Tables)
 12 Months Ended
Dec. 31, 2012
Investments [Abstract]  
Schedule of Available for Sale and Held to Maturity Securities
The amortized cost and fair values of investments are as follows (in thousands):
 
Available-for-Sale
 
Amortized
Cost
 
Cumulative Non-Credit
OTTI Losses
Recognized
in OCI
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value/
Carrying Value
December 31, 2012
 
 
 
 
 
 
 
 
 
State and municipal securities
$
60,984

 
$
—

 
$
2,823

 
$
(158
)
 
$
63,649

Mortgage-backed securities - Agency Pass Throughs
71,821

 
—

 
2,224

 
(652
)
 
73,393

Mortgage-backed securities - Agency CMO's
110,683

 
—

 
2,209

 
(328
)
 
112,564

SBA Pools
19,962

 
—

 
359

 
—

 
20,321

Mortgage-backed securities - Non Agency CMO's (below investment grade)
10,889

 
(1,661
)
 
1,401

 
(387
)
 
10,242

 
$
274,339

 
$
(1,661
)
 
$
9,016

 
$
(1,525
)
 
$
280,169

December 31, 2011
 
 
 
 
 
 
 
 
 
U.S. treasury securities and obligations of U.S. government agencies
$
21

 
$
—

 
$
—

 
$
—

 
$
21

State and municipal securities
35,352

 
—

 
1,791

 
(8
)
 
37,135

Mortgage-backed securities - Agency Pass Throughs
59,436

 
—

 
2,252

 
(126
)
 
61,562

Mortgage-backed securities - Agency CMO's
103,349

 
—

 
2,526

 
(328
)
 
105,547

Mortgage-backed securities - Non Agency CMO's (investment grade)
5,934

 
—

 
389

 
—

 
6,323

Mortgage-backed securities - Non Agency CMO's (below investment grade)
10,489

 
(2,011
)
 
435

 
(462
)
 
8,451

 
$
214,581

 
$
(2,011
)
 
$
7,393

 
$
(924
)
 
$
219,039

 
Held-to-Maturity
 
Carrying Value / Amortized Cost
 
Cumulative Non-Credit
OTTI Losses
Recognized
in OCI
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
December 31, 2012
 
 
 
 
 
 
 
 
 
State and municipal securities
$
14,826

 
$
—

 
$
1,518

 
$
—

 
$
16,344

December 31, 2011
 
 
 
 
 
 
 
 
 
State and municipal securities
$
16,143

 
$
—

 
$
1,328

 
$
—

 
$
17,471
Available-for-Sale and Held to Maturity Securities Continuous Unrealized Loss Position
The following table summarizes the duration of Intermountain’s unrealized losses on available-for-sale and held-to-maturity securities as of the dates indicated (in thousands).
 
Less Than 12 Months
 
12 Months or Longer
 
Total
December 31, 2012
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
Mortgage-backed securities & CMO’s
$
57,180

 
$
(785
)
 
$
11,408

 
$
(582
)
 
$
68,588

 
$
(1,367
)
State and municipal securities
12,019

 
(158
)
 
—

 
—

 
12,019

 
(158
)
Total
$
69,199

 
$
(943
)
 
$
11,408

 
$
(582
)
 
$
80,607

 
$
(1,525
)

 
Less Than 12 Months
 
12 Months or Longer
 
Total
December 31, 2011
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
State and municipal securities
$
1,659

 
$
(8
)
 
$
—

 
$
—

 
$
1,659

 
$
(8
)
Mortgage-backed securities & CMO’s
39,905

 
(433
)
 
3,993

 
(483
)
 
43,898

 
(916
)
Total
$
41,564

 
$
(441
)
 
$
3,993

 
$
(483
)
 
$
45,557

 
$
(924
)
Investments Classified by Contractual Maturity Date
At December 31, 2012, the amortized cost and fair value of available-for-sale and held-to-maturity debt securities, by contractual maturity, are as follows (in thousands):
 
Available-for-Sale
 
Held-to-Maturity
 
Amortized
Cost
 
Fair
Value
 
Amortized
Cost
 
Fair
Value
One year or less
$
—

 
$
—

 
$
503

 
$
514

After one year through five years
3,590

 
3,746

 
1,854

 
1,985

After five years through ten years
8,183

 
8,082

 
10,962

 
12,069

After ten years
49,210

 
51,821

 
1,507

 
1,776

Subtotal
60,983

 
63,649

 
14,826

 
16,344

Mortgage-backed securities
193,394

 
196,200

 
—

 
—

SBA Pools
19,962

 
20,320

 
—

 
—

Total Securities
$
274,339

 
$
280,169

 
$
14,826

 
$
16,344
Other Than Temporary Impairment Losses
The following table presents the OTTI losses for the year ended December 31, 2012, 2011 and 2010:
 
2012
 
2011
 
2010
 
Held To
Maturity
 
Available
For Sale
 
Held To
Maturity
 
Available
For Sale
 
Held To
Maturity
 
Held To
Maturity
Total other-than-temporary impairment losses
$
—

 
$
7

 
$
—

 
$
229

 
$
—

 
$
1,529

Portion of other-than-temporary impairment losses transferred from (recognized in) other comprehensive income (1)
—

 
350

 
—

 
(84
)
 
—

 
(701
)
Net impairment losses recognized in earnings (2)
$
—

 
$
357

 
$
—

 
$
145

 
$
—

 
$
828

_____________________________
(1)
Represents other-than-temporary impairment losses related to all other factors.
(2)
Represents other-than-temporary impairment losses related to credit losses.