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Investments (Tables)
 6 Months Ended
Jun. 30, 2012
Investments [Abstract]  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
A summary of investment securities follows:
 
Amortized
Cost
 
Unrealized
 
Fair
Value
Gains
 
Losses
 
(In thousands)
At June 30, 2012:
 
 
 
 
 
 
 
Available for sale securities at fair value:
 
 
 
 
 
 
 
U.S. government and agencies
$
4,218

 
$
13

 
$
(6
)
 
$
4,225

Government-sponsored entities
285,192

 
1,393

 
(45
)
 
286,540

Corporate bonds
4,978

 
—

 
(3
)
 
4,975

Municipal bonds
171,338

 
3,047

 
(175
)
 
174,210

Mortgage-backed securities (1)
248,530

 
6,490

 
(178
)
 
254,842

Other
9,484

 
112

 
(26
)
 
9,570

Total
$
723,740

 
$
11,055

 
$
(433
)
 
$
734,362

 
 
 
 
 
 
 
 
At 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 sets forth the maturities of investment securities available for sale, based on contractual maturity, as of June 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
$
47,081

 
$
47,599

After one, but within five years
336,660

 
340,025

After five, but within ten years
99,104

 
99,875

Greater than ten years
240,895

 
246,863

Total
$
723,740

 
$
734,362
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:
 
For the three months
ended June 30,
 
For the six months
ended June 30,
2012
 
2011
 
2012
 
2011
(In thousands)
Proceeds from sales
$
44,878

 
$
46,829

 
$
49,237

 
$
128,931

Realized gains
882

 
212

 
899

 
868

Realized losses
(43
)
 
(45
)
 
(46
)
 
(282
)
Schedule of Unrealized Loss on Investments [Table Text Block]
The following tables set forth information regarding securities at June 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
$
1,424

 
$
(6
)
 
$
—

 
$
—

 
$
1,424

 
$
(6
)
 
1

Government-sponsored entities
27,189

 
(44
)
 
2,006

 
(1
)
 
29,195

 
(45
)
 
4

Corporate bonds
4,975

 
(3
)
 
—

 
—

 
4,975

 
(3
)
 
1

Municipal bonds
24,408

 
(175
)
 
—

 
—

 
24,408

 
(175
)
 
14

Mortgage-backed securities
48,997

 
(135
)
 
2,485

 
(43
)
 
51,482

 
(178
)
 
8

Other
95

 
(15
)
 
34

 
(11
)
 
129

 
(26
)
 
18

Total
$
107,088

 
$
(378
)
 
$
4,525

 
$
(55
)
 
$
111,613

 
$
(433
)
 
46