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Investments (Tables)
 3 Months Ended
Mar. 31, 2015
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 March 31, 2015
 
 
 
 
 
 
 
Available for sale securities at fair value:
 
 
 
 
 
 
 
U.S. government and agencies
$
16,685

 
$
191

 
$
(45
)
 
$
16,831

Government-sponsored entities
293,321

 
2,796

 
(82
)
 
296,035

Municipal bonds
234,230

 
3,601

 
(189
)
 
237,642

Mortgage-backed securities (1)
405,338

 
2,977

 
(2,517
)
 
405,798

Other
15,228

 
332

 
(24
)
 
15,536

Total
$
964,802

 
$
9,897

 
$
(2,857
)
 
$
971,842

 
 
 
 
 
 
 
 
Held to maturity securities at amortized cost:
 
 
 
 
 
 
 
Mortgage-backed securities (1)
$
134,978

 
$
2,249

 
$
—

 
$
137,227

Total
$
134,978

 
$
2,249

 
$
—

 
$
137,227

 
 
 
 
 
 
 
 
As of December 31, 2014
 
 
 
 
 
 
 
Available for sale securities at fair value:
 
 
 
 
 
 
 
U.S. government and agencies
$
16,894

 
$
32

 
$
(44
)
 
$
16,882

Government-sponsored entities
273,538

 
983

 
(268
)
 
274,253

Municipal bonds
232,415

 
3,268

 
(435
)
 
235,248

Mortgage-backed securities (1)
284,403

 
2,191

 
(2,890
)
 
283,704

Other
19,608

 
309

 
(11
)
 
19,906

Total
$
826,858

 
$
6,783

 
$
(3,648
)
 
$
829,993

 
 
 
 
 
 
 
 
Held to maturity securities at amortized cost:
 
 
 
 
 
 
 
Mortgage-backed securities (1)
$
140,727

 
$
1,638

 
$
(26
)
 
$
142,339

Total
$
140,727

 
$
1,638

 
$
(26
)
 
$
142,339

___________________
(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 March 31, 2015. 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
$
43,864

 
$
44,378

After one, but within five years
404,426

 
407,753

After five, but within ten years
87,761

 
89,482

Greater than ten years
428,751

 
430,229

Total
$
964,802

 
$
971,842



The following table presents the maturities of investment securities held to maturity, based on contractual maturity, as of March 31, 2015.
 
Held to Maturity Securities
Amortized
cost
 
Fair
value
(In thousands)
Within one year
$
—

 
$
—

After one, but within five years
—

 
—

After five, but within ten years
—

 
—

Greater than ten years
134,978

 
137,227

Total
$
134,978

 
$
137,227
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 March 31,
2015
 
2014
(In thousands)
Proceeds from sales
$
5,015

 
$
5,328

Realized gains
8

 
1

Realized losses
—

 
—
Schedule of Unrealized Loss on Investments [Table Text Block]
The following table presents information regarding securities as of March 31, 2015 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
$
721

 
$
(14
)
 
$
591

 
$
(31
)
 
$
1,312

 
$
(45
)
 
2

Government-sponsored entities
9,982

 
(13
)
 
29,055

 
(69
)
 
39,037

 
(82
)
 
4

Municipal bonds
33,103

 
(144
)
 
4,399

 
(45
)
 
37,502

 
(189
)
 
22

Mortgage-backed securities
154,473

 
(626
)
 
81,724

 
(1,891
)
 
236,197

 
(2,517
)
 
47

Other
82

 
(21
)
 
9

 
(3
)
 
91

 
(24
)
 
11

Total
$
198,361

 
$
(818
)
 
$
115,778

 
$
(2,039
)
 
$
314,139

 
$
(2,857
)
 
86

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Held to maturity securities
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
—

Total
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
—