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Investments (Tables)
 9 Months Ended
Sep. 30, 2012
Investments [Abstract]  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
The following table presents a summary of investment securities:
 
Amortized
Cost
 
Unrealized
 
Fair
Value
Gains
 
Losses
 
(In thousands)
As of September 30, 2012
 
 
 
 
 
 
 
Available for sale securities at fair value:
 
 
 
 
 
 
 
U.S. government and agencies
$
2,789

 
$
—

 
$
(11
)
 
$
2,778

Government-sponsored entities
227,204

 
1,260

 
—

 
228,464

Corporate bonds
4,990

 
—

 
(34
)
 
4,956

Municipal bonds
198,712

 
3,816

 
(36
)
 
202,492

Mortgage-backed securities (1)
299,246

 
6,868

 
(280
)
 
305,834

Other
10,514

 
106

 
(19
)
 
10,601

Total
$
743,455

 
$
12,050

 
$
(380
)
 
$
755,125

 
 
 
 
 
 
 
 
As of December 31, 2011
 
 
 
 
 
 
 
Available for sale securities at fair value:
 
 
 
 
 
 
 
U.S. government and agencies
$
4,603

 
$
20

 
$
(21
)
 
$
4,602

Government-sponsored entities
378,055

 
1,458

 
(90
)
 
379,423

Corporate bonds
4,953

 
—

 
(41
)
 
4,912

Municipal bonds
196,961

 
3,733

 
(19
)
 
200,675

Mortgage-backed securities (1)
248,329

 
6,403

 
(388
)
 
254,344

Other
474

 
95

 
(29
)
 
540

Total
$
833,375

 
$
11,709

 
$
(588
)
 
$
844,496

___________________
(1)
 All mortgage-backed securities are guaranteed by U.S. government agencies or Government-sponsored entities.
Investments Classified by Contractual Maturity Date [Table Text Block]
The following table presents the maturities of investment securities available for sale, based on contractual maturity, as of September 30, 2012. Certain securities are callable before their final maturity. Additionally, certain securities (such as mortgage-backed securities) are shown within the table below based on their final (contractual) maturity, but, due to prepayments and amortization, are expected to have shorter lives.
 
Available for Sale Securities
Amortized
cost
 
Fair
value
(In thousands)
Within one year
$
57,379

 
$
57,889

After one, but within five years
277,400

 
280,763

After five, but within ten years
111,201

 
112,823

Greater than ten years
297,475

 
303,650

Total
$
743,455

 
$
755,125
Realized Gain (Loss) on Investments [Table Text Block]
The following table presents the proceeds from sales, gross realized gains and gross realized losses for securities available for sale that were sold during the following periods:
 
Three months ended September 30,
 
Nine months ended September 30,
2012
 
2011
 
2012
 
2011
(In thousands)
Proceeds from sales
$
86

 
$
2,110

 
$
49,323

 
$
131,041

Realized gains
25

 
108

 
924

 
976

Realized losses
—

 
(5
)
 
(46
)
 
(287
)
Schedule of Unrealized Loss on Investments [Table Text Block]
The following tables presents information regarding securities as of September 30, 2012 having temporary impairment, due to the fair values having declined below the amortized cost of the individual securities, and the time period that the investments have been temporarily impaired.
 
Less than 12 months
 
12 months or longer
 
Total
 
Fair
value
 
Unrealized
losses
 
Fair
value
 
Unrealized
losses
 
Fair
value
 
Unrealized
losses
 
# of
securities
Available for sale securities
(In thousands)
U.S. government and agencies
$
1,500

 
$
(5
)
 
$
1,278

 
$
(6
)
 
$
2,778

 
$
(11
)
 
2

Government-sponsored entities
—

 
—

 
—

 
—

 
—

 
—

 
—

Corporate bonds
4,956

 
(34
)
 
—

 
—

 
4,956

 
(34
)
 
1

Municipal bonds
6,526

 
(36
)
 
—

 
—

 
6,526

 
(36
)
 
4

Mortgage-backed securities
54,330

 
(252
)
 
3,091

 
(28
)
 
57,421

 
(280
)
 
9

Other
98

 
(10
)
 
42

 
(9
)
 
140

 
(19
)
 
14

Total
$
67,410

 
$
(337
)
 
$
4,411

 
$
(43
)
 
$
71,821

 
$
(380
)
 
30