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Investments And MBS (Tables)
12 Months Ended
Dec. 31, 2012
Investments and MBS [Abstract]  
Available-for-sale Securities [Table Text Block]
The carrying and fair values of investments and MBS are summarized as follows:
 
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
 
(in thousands)
December 31, 2012
 
 
 
 
 
 
 
Available for sale
 
 
 
 
 
 
 
MBS
$
1,263,786

 
$
45,052

 
$
0

 
$
1,308,838

Municipal bonds
188,467

 
16,452

 
(613
)
 
204,306

Other
5

 
8

 
0

 
13

Total
$
1,452,258

 
$
61,512

 
$
(613
)
 
$
1,513,157

Held to maturity
 
 
 
 
 
 
 
Tax credits
$
206

 
$
0

 
$
0

 
$
206

Total
$
206

 
$
0

 
$
0

 
$
206

December 31, 2011
 
 
 
 
 
 
 
Available for sale
 
 
 
 
 
 
 
MBS
$
2,265,207

 
$
55,760

 
$
(33
)
 
$
2,320,934

Municipal bonds
195,512

 
13,338

 
(1,394
)
 
207,456

Other
24,923

 
2

 
(5,439
)
 
19,486

Total
$
2,485,642

 
$
69,100

 
$
(6,866
)
 
$
2,547,876

Held to maturity
 
 
 
 
 
 
 
Tax credits
$
1,747

 
$
0

 
$
0

 
$
1,747

Total
$
1,747

 
$
0

 
$
0

 
$
1,747



Realized Gain (Loss) on Investments [Table Text Block]
Total sales of Sterling’s securities during the years ended December 31, 2012, 2011 and 2010 are summarized as follows:

 
Proceeds from
Sales
 
Gross Realized
Gains
 
Gross Realized
Losses
 
(in thousands)
Years Ended:
 
 
 
 
 
December 31, 2012
$
879,174

 
$
24,024

 
$
189

December 31, 2011
586,340

 
18,771

 
2,535

December 31, 2010
1,056,677

 
35,546

 
9,804

Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]
The following table summarizes Sterling’s investments and MBS that had a market value below their amortized cost as of December 31, 2012 and December 31, 2011, segregated by those investments that have been in a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position for 12 months or longer:
 
 
Less than 12 months
 
12 months or longer
 
Total
 
Market Value
 
Unrealized
Losses
 
Market Value
 
Unrealized
Losses
 
Market Value
 
Unrealized
Losses
 
(in thousands)
December 31, 2012
 
 
 
 
 
 
 
 
 
 
 
MBS
$
0

 
$
0

 
$
0

 
$
0

 
$
0

 
$
0

Municipal bonds
0

 
0

 
12,921

 
(613
)
 
12,921

 
(613
)
Other
0

 
0

 
0

 
0

 
0

 
0

Total
$
0

 
$
0

 
$
12,921

 
$
(613
)
 
$
12,921

 
$
(613
)
December 31, 2011
 
 
 
 
 
 
 
 
 
 
 
MBS
$
1,419

 
$
(12
)
 
$
24,726

 
$
(21
)
 
$
26,145

 
$
(33
)
Municipal bonds
0

 
0

 
17,289

 
(1,394
)
 
17,289

 
(1,394
)
Other
0

 
0

 
19,479

 
(5,439
)
 
19,479

 
(5,439
)
Total
$
1,419

 
$
(12
)
 
$
61,494

 
$
(6,854
)
 
$
62,913

 
$
(6,866
)
Investments Classified by Contractual Maturity Date [Table Text Block]
Actual maturities for MBS will differ from contractual maturities as a result of the level of prepayments experienced on the underlying mortgages.  
 
Held to maturity
 
Available for sale
 
Amortized Cost
 
Estimated Fair
Value
 
Amortized Cost
 
Estimated Fair
Value
 
(in thousands)
Due within one year
$
0

 
$
0

 
$
0

 
$
0

Due after one year through five years
0

 
0

 
3,033

 
3,266

Due after five years through ten years
0

 
0

 
70,704

 
73,979

Due after ten years
206

 
206

 
1,378,521

 
1,435,912

Total
$
206

 
$
206

 
$
1,452,258

 
$
1,513,157

Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]
The following table presents a roll-forward of OTTI for the periods presented:
 
Years Ended December 31,
 
2012
 
2011
 
2010
 
(in thousands)
OTTI, beginning balance
$
0

 
$
0

 
$
0

Additions
6,819

 
0

 
0

Realized
(6,819
)
 
0

 
0

Ending Balance
$
0

 
$
0

 
$
0