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Investments (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2016
 
 
 
 
 
 
 
Available-for-sale securities at fair value:
 
 
 
 
 
 
 
U.S. government and agencies
$
30,911

 
$
481

 
$
(4
)
 
$
31,388

Government-sponsored entities
344,945

 
5,585

 
—

 
350,530

Municipal bonds
264,375

 
7,334

 
(95
)
 
271,614

Mortgage-backed securities (1)
477,488

 
3,657

 
(1,595
)
 
479,550

Other
18,161

 
291

 
(5
)
 
18,447

Total
$
1,135,880

 
$
17,348

 
$
(1,699
)
 
$
1,151,529

 
 
 
 
 
 
 
 
Held-to-maturity securities at amortized cost:
 
 
 
 
 
 
 
Mortgage-backed securities (1)
$
111,337

 
$
1,524

 
$
—

 
$
112,861

Total
$
111,337

 
$
1,524

 
$
—

 
$
112,861

 
 
 
 
 
 
 
 
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 March 31, 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
$
78,573

 
$
78,999

After one, but within five years
339,665

 
345,000

After five, but within ten years
199,337

 
203,373

Greater than ten years
518,305

 
524,157

Total
$
1,135,880

 
$
1,151,529



The following table presents the maturities of held-to-maturity investment securities, based on contractual maturity, as of March 31, 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
111,337

 
112,861

Total
$
111,337

 
$
112,861
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 March 31,
2016
 
2015
(In thousands)
Proceeds from sales
$
15,292

 
$
5,015

Realized gains
2

 
8

Realized losses
(1
)
 
—
Schedule of Unrealized Loss on Investments [Table Text Block]
The following table presents information regarding securities as of March 31, 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
$
—

 
$
—

 
$
729

 
$
(4
)
 
$
729

 
$
(4
)
 
2

Government-sponsored entities
—

 
—

 
—

 
—

 
—

 
—

 
—

Municipal bonds
10,635

 
(29
)
 
2,772

 
(66
)
 
13,407

 
(95
)
 
10

Mortgage-backed securities (1)
26,422

 
(150
)
 
101,846

 
(1,445
)
 
128,268

 
(1,595
)
 
38

Other
70

 
(3
)
 
12

 
(2
)
 
82

 
(5
)
 
9

Total
$
37,127

 
$
(182
)
 
$
105,359

 
$
(1,517
)
 
$
142,486

 
$
(1,699
)
 
59

 
 
 
 
 
 
 
 
 
 
 
 
 
 
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.