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Investments (Tables)
 6 Months Ended
Jun. 30, 2016
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 June 30, 2016
 
 
 
 
 
 
 
Available-for-sale securities at fair value:
 
 
 
 
 
 
 
U.S. government and agencies
$
40,822

 
$
920

 
$
(5
)
 
$
41,737

Government-sponsored entities
335,632

 
7,578

 
—

 
343,210

Municipal bonds
265,507

 
10,877

 
(68
)
 
276,316

Mortgage-backed securities (1)
503,993

 
7,145

 
(1,109
)
 
510,029

Other
19,952

 
288

 
(9
)
 
20,231

Total
$
1,165,906

 
$
26,808

 
$
(1,191
)
 
$
1,191,523

 
 
 
 
 
 
 
 
Held-to-maturity securities at amortized cost:
 
 
 
 
 
 
 
Mortgage-backed securities (1)
$
105,297

 
$
2,092

 
$
—

 
$
107,389

Total
$
105,297

 
$
2,092

 
$
—

 
$
107,389

 
 
 
 
 
 
 
 
As of December 31, 2015
 
 
 
 
 
 
 
Available-for-sale securities at fair value:
 
 
 
 
 
 
 
U.S. government and agencies
$
21,214

 
$
64

 
$
(27
)
 
$
21,251

Government-sponsored entities
345,033

 
874

 
(1,345
)
 
344,562

Municipal bonds
263,661

 
5,099

 
(116
)
 
268,644

Mortgage-backed securities (1)
431,446

 
1,329

 
(5,734
)
 
427,041

Other
22,751

 
268

 
(7
)
 
23,012

Total
$
1,084,105

 
$
7,634

 
$
(7,229
)
 
$
1,084,510

 
 
 
 
 
 
 
 
Held-to-maturity securities at amortized cost:
 
 
 
 
 
 
 
Mortgage-backed securities (1)
$
116,352

 
$
294

 
$
(262
)
 
$
116,384

Total
$
116,352

 
$
294

 
$
(262
)
 
$
116,384

___________________
(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 available-for-sale investment securities, based on contractual maturity, as of June 30, 2016. 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
$
90,599

 
$
91,045

After one, but within five years
310,027

 
316,819

After five, but within ten years
243,664

 
250,725

Greater than ten years
521,616

 
532,934

Total
$
1,165,906

 
$
1,191,523



The following table presents the maturities of held-to-maturity investment securities, based on contractual maturity, as of June 30, 2016.
 
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
105,297

 
107,389

Total
$
105,297

 
$
107,389
Realized Gain (Loss) on Investments [Table Text Block]
The following table presents the proceeds from sales, gross realized gains and gross realized losses for available-for-sale securities that were sold during the following periods:
 
Three months ended June 30,
 
Six months ended June 30,
2016
 
2015
 
2016
 
2015
(In thousands)
Proceeds from sales
$
13,840

 
$
820

 
$
29,132

 
$
5,835

Realized gains
245

 
8

 
247

 
16

Realized losses
—

 
—

 
(1
)
 
—
Schedule of Unrealized Loss on Investments [Table Text Block]
The following table presents information regarding securities as of June 30, 2016 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
$
—

 
$
—

 
$
728

 
$
(5
)
 
$
728

 
$
(5
)
 
2

Government-sponsored entities
—

 
—

 
—

 
—

 
—

 
—

 
—

Municipal bonds
—

 
—

 
2,762

 
(68
)
 
2,762

 
(68
)
 
2

Mortgage-backed securities (1)
14,228

 
(104
)
 
48,167

 
(1,005
)
 
62,395

 
(1,109
)
 
35

Other
54

 
(8
)
 
12

 
(1
)
 
66

 
(9
)
 
8

Total
$
14,282

 
$
(112
)
 
$
51,669

 
$
(1,079
)
 
$
65,951

 
$
(1,191
)
 
47

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Held-to-maturity securities
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities (1)
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
—

Total
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
—


___________________
(1)
 All mortgage-backed securities are guaranteed by U.S. government agencies or Government-sponsored entities.