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Investments (Tables)
 9 Months Ended
Sep. 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 September 30, 2016
 
 
 
 
 
 
 
Available-for-sale securities at fair value:
 
 
 
 
 
 
 
U.S. government and agencies
$
40,725

 
$
627

 
$
(9
)
 
$
41,343

Government-sponsored entities
318,570

 
6,142

 
—

 
324,712

Municipal bonds
276,582

 
8,558

 
(505
)
 
284,635

Mortgage-backed securities (1)
571,487

 
6,684

 
(1,321
)
 
576,850

Other
21,703

 
340

 
(5
)
 
22,038

Total
$
1,229,067

 
$
22,351

 
$
(1,840
)
 
$
1,249,578

 
 
 
 
 
 
 
 
Held-to-maturity securities at amortized cost:
 
 
 
 
 
 
 
Mortgage-backed securities (1)
$
98,881

 
$
1,639

 
$
(11
)
 
$
100,509

Total
$
98,881

 
$
1,639

 
$
(11
)
 
$
100,509

 
 
 
 
 
 
 
 
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 September 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
$
76,630

 
$
77,071

After one, but within five years
316,612

 
322,158

After five, but within ten years
321,670

 
327,746

Greater than ten years
514,155

 
522,603

Total
$
1,229,067

 
$
1,249,578



The following table presents the maturities of held-to-maturity investment securities, based on contractual maturity, as of September 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
98,881

 
100,509

Total
$
98,881

 
$
100,509
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 or called during the following periods:
 
Three months ended September 30,
 
Nine months ended September 30,
2016
 
2015
 
2016
 
2015
(In thousands)
Proceeds from sales and calls
$
12,829

 
$
15

 
$
41,961

 
$
5,850

Realized gains
273

 
5

 
520

 
21

Realized losses
—

 
—

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

 
$
—

 
$
649

 
$
(9
)
 
$
649

 
$
(9
)
 
2

Government-sponsored entities
—

 
—

 
—

 
—

 
—

 
—

 
—

Municipal bonds
33,558

 
(449
)
 
2,741

 
(56
)
 
36,299

 
(505
)
 
28

Mortgage-backed securities (1)
64,537

 
(258
)
 
43,934

 
(1,063
)
 
108,471

 
(1,321
)
 
39

Other
61

 
(3
)
 
23

 
(2
)
 
84

 
(5
)
 
8

Total
$
98,156

 
$
(710
)
 
$
47,347

 
$
(1,130
)
 
$
145,503

 
$
(1,840
)
 
77

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Held-to-maturity securities
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities (1)
$
5,239

 
$
(11
)
 
$
—

 
$
—

 
$
5,239

 
$
(11
)
 
1

Total
$
5,239

 
$
(11
)
 
$
—

 
$
—

 
$
5,239

 
$
(11
)
 
1


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