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Mortgage Loans on Real Estate Mortgage Loans on Real Estate (Tables)
 3 Months Ended
Mar. 31, 2013
Mortgage Loans on Real Estate [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Our mortgage loan portfolio, summarized in the following table, totaled $2.6 billion at March 31, 2013 and December 31, 2012, with commitments outstanding of $73.0 million at March 31, 2013.
 
March 31, 2013
 
December 31, 2012
 
(Dollars in thousands)
Principal outstanding
$
2,625,737

 
$
2,658,883

Loan loss allowance
(33,031
)
 
(34,234
)
Deferred prepayment fees
(809
)
 
(709
)
Carrying value
$
2,591,897

 
$
2,623,940
Schedule of Commercial Mortgage Loans by Geographic Region and Specific Collateral Property Type [Table Text Block]
The portfolio consists of commercial mortgage loans collateralized by the related properties and diversified as to property type, location and loan size. Our mortgage lending policies establish limits on the amount that can be loaned to one borrower and other criteria to attempt to reduce the risk of default. The mortgage loan portfolio is summarized by geographic region and property type as follows:
 
March 31, 2013
 
December 31, 2012
 
Principal Outstanding
 
Percent
 
Principal Outstanding
 
Percent
 
(Dollars in thousands)
Geographic distribution
 
 
 
 
 
 
 
East
$
744,863

 
28.4
%
 
$
732,762

 
27.5
%
Middle Atlantic
163,497

 
6.2
%
 
155,094

 
5.8
%
Mountain
371,550

 
14.2
%
 
387,599

 
14.6
%
New England
24,675

 
0.9
%
 
26,385

 
1.0
%
Pacific
317,017

 
12.1
%
 
320,982

 
12.1
%
South Atlantic
459,579

 
17.5
%
 
458,802

 
17.3
%
West North Central
354,299

 
13.5
%
 
370,168

 
13.9
%
West South Central
190,257

 
7.2
%
 
207,091

 
7.8
%
 
$
2,625,737

 
100.0
%
 
$
2,658,883

 
100.0
%
Property type distribution
 
 
 
 
 
 
 
Office
$
684,553

 
26.1
%
 
$
666,467

 
25.1
%
Medical Office
130,874

 
5.0
%
 
136,764

 
5.1
%
Retail
656,187

 
25.0
%
 
677,951

 
25.5
%
Industrial/Warehouse
672,522

 
25.6
%
 
692,637

 
26.1
%
Hotel
89,376

 
3.4
%
 
94,045

 
3.5
%
Apartment
220,698

 
8.4
%
 
219,335

 
8.2
%
Mixed use/other
171,527

 
6.5
%
 
171,684

 
6.5
%
 
$
2,625,737

 
100.0
%
 
$
2,658,883

 
100.0
%
Allowance for Credit Losses on Financing Receivables [Table Text Block]
The following tables present a rollforward of our specific and general valuation allowances for mortgage loans on real estate:
 
Three Months Ended
March 31, 2013
 
Three Months Ended
March 31, 2012
 
Specific Allowance
 
General Allowance
 
Specific Allowance
 
General Allowance
 
(Dollars in thousands)
Beginning allowance balance
$
(23,134
)
 
$
(11,100
)
 
$
(23,664
)
 
$
(9,300
)
Charge-offs
1,569

 
—

 
900

 
—

Recoveries
—

 
—

 
—

 
—

Provision for credit losses
(1,066
)
 
700

 
(6,831
)
 
(1,000
)
Ending allowance balance
$
(22,631
)
 
$
(10,400
)
 
$
(29,595
)
 
$
(10,300
)
Real Estate Acquired Via Foreclosure or Deed In Lieu [Table Text Block]
During the three months ended March 31, 2013, one mortgage loan was satisfied by taking ownership of the real estate serving as collateral compared to nine mortgage loans for the same period in 2012. The following table summarizes the activity in the real estate owned which was obtained in satisfaction of mortgage loans on real estate:
 
Three Months Ended
March 31,
 
2013
 
2012
 
(Dollars in thousands)
Real estate owned at beginning of period
$
33,172

 
$
36,821

Real estate acquired in satisfaction of mortgage loans
844

 
3,303

Sales
(5,080
)
 
(3,083
)
Impairments
—

 
(974
)
Depreciation
(172
)
 
(243
)
Real estate owned at end of period
$
28,764

 
$
35,824
Financing Receivable Credit Quality Indicators [Table Text Block]
We analyze credit risk of our mortgage loans by analyzing all available evidence on loans that are delinquent and loans that are in a workout period.
 
March 31, 2013
 
December 31, 2012
 
(Dollars in thousands)
Credit Exposure--By Payment Activity
 
 
 
Performing
$
2,578,031

 
$
2,597,440

In workout
28,326

 
26,723

Collateral dependent
19,380

 
34,720

 
$
2,625,737

 
$
2,658,883
Past Due Financing Receivables [Table Text Block]
Aging of financing receivables is summarized in the following table, with loans in a "workout" period as of the reporting date considered current if payments are current in accordance with agreed upon terms:
 
30 - 59 Days
 
60 - 89 Days
 
90 Days and Over
 
Total Past Due
 
Current
 
Collateral Dependent Receivables
 
Total Financing Receivables
 
(Dollars in thousands)
Commercial Mortgage Loans
 
 
 
 
 
 
 
 
 
 
 
 
 
March 31, 2013
$
—

 
$
—

 
$
—

 
$
—

 
$
2,606,357

 
$
19,380

 
$
2,625,737

December 31, 2012
$
—

 
$
—

 
$
—

 
$
—

 
$
2,624,163

 
$
34,720

 
$
2,658,883
Impaired Financing Receivables [Table Text Block]
Financing receivables summarized in the following table represent all loans that we are either not currently collecting or those we feel it is probable we will not collect all amounts due according to the contractual terms of the loan agreements (all loans that we have worked with the borrower to alleviate short-term cash flow issues, loans delinquent for more than 60 days at the reporting date, loans we have determined to be collateral dependent and loans that we have recorded specific impairments on that we feel may continue to have performance issues).
 
Recorded Investment
 
Unpaid Principal Balance
 
Related Allowance
 
Average Recorded Investment
 
Interest Income Recognized
 
(Dollars in thousands)
March 31, 2013
 
 
 
 
 
 
 
 
 
Mortgage loans with an allowance
$
23,887

 
$
46,518

 
$
(22,631
)
 
$
28,384

 
$
331

Mortgage loans with no related allowance
20,413

 
20,413

 
—

 
20,505

 
284

 
$
44,300

 
$
66,931

 
$
(22,631
)
 
$
48,889

 
$
615

December 31, 2012
 
 
 
 
 
 
 
 
 
Mortgage loans with an allowance
$
29,976

 
$
53,110

 
$
(23,134
)
 
$
37,480

 
$
1,946

Mortgage loans with no related allowance
27,765

 
27,765

 
—

 
27,696

 
1,664

 
$
57,741

 
$
80,875

 
$
(23,134
)
 
$
65,176

 
$
3,610
Troubled Debt Restructurings on Financing Receivables Workout Loans [Table Text Block]
Mortgage loan workouts, refinances or restructures that are classified as TDR are individually evaluated and measured for impairment. A summary of mortgage loans on commercial real estate with outstanding principal at March 31, 2013 and December 31, 2012 that we determined to be TDR's are as follows:
Geographic Region
 
Number of TDR's
 
Principal Balance Outstanding
 
Specific Loan Loss Allowance
 
Net Carrying Amount
 
 
 
 
(Dollars in thousands)
March 31, 2013
 
 
 
 
 
 
 
 
East
 
1
 
$
4,208

 
$
(1,425
)
 
$
2,783

Mountain
 
9
 
25,533

 
(1,172
)
 
24,361

South Atlantic
 
7
 
17,287

 
(5,898
)
 
11,389

East North Central
 
1
 
2,219

 
(467
)
 
1,752

West North Central
 
3
 
8,688

 
(2,136
)
 
6,552

 
 
21
 
$
57,935

 
$
(11,098
)
 
$
46,837

December 31, 2012
 
 
 
 
 
 
 
 
East
 
1
 
$
4,208

 
$
(1,425
)
 
$
2,783

Mountain
 
10
 
28,786

 
(1,702
)
 
27,084

South Atlantic
 
9
 
23,358

 
(5,047
)
 
18,311

East North Central
 
1
 
2,232

 
(467
)
 
1,765

West North Central
 
3
 
9,466

 
(2,328
)
 
7,138

 
 
24
 
$
68,050

 
$
(10,969
)
 
$
57,081
Impaired Mortgage Loans on Real Estate by Basis of Impairment [Table Text Block]
The specific allowance is a total of credit loss allowances on loans which are individually evaluated for impairment. The general allowance is the group of loans discussed above which are collectively evaluated for impairment. The following table presents the total outstanding principal of loans evaluated for impairment by basis of impairment method:
 
March 31, 2013
 
December 31, 2012
 
(Dollars in thousands)
Individually evaluated for impairment
$
44,299

 
$
53,110

Collectively evaluated for impairment
2,581,438

 
2,605,773

Total loans evaluated for impairment
$
2,625,737

 
$
2,658,883