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Investments
 6 Months Ended
Jun. 30, 2017
Investments [Abstract]  
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]
    Investments
The following table presents a summary of investment securities:
 
Amortized
Cost
 
Unrealized
 
Fair
Value
Gains
 
Losses
 
(In thousands)
As of June 30, 2017
 
 
 
 
 
 
 
Available-for-sale securities at fair value:
 
 
 
 
 
 
 
U.S. government and agencies
$
35,214

 
$
38

 
$
(593
)
 
$
34,659

Government-sponsored entities
305,318

 
997

 
(1,185
)
 
305,130

Municipal bonds
294,616

 
4,674

 
(2,187
)
 
297,103

Mortgage-backed securities (1)
557,148

 
785

 
(11,429
)
 
546,504

Other
4,875

 
454

 
(5
)
 
5,324

Total
$
1,197,171

 
$
6,948

 
$
(15,399
)
 
$
1,188,720

 
 
 
 
 
 
 
 
Held-to-maturity securities at amortized cost:
 
 
 
 
 
 
 
U.S. government and agencies
$
14,975

 
$
—

 
(4
)
 
$
14,971

Mortgage-backed securities (1)
$
84,049

 
$
75

 
$
(382
)
 
$
83,742

Total
$
99,024

 
$
75

 
$
(386
)
 
$
98,713

 
 
 
 
 
 
 
 
As of December 31, 2016
 
 
 
 
 
 
 
Available-for-sale securities at fair value:
 
 
 
 
 
 
 
U.S. government and agencies
$
40,704

 
$
86

 
$
(854
)
 
$
39,936

Government-sponsored entities
337,865

 
1,058

 
(2,259
)
 
336,664

Municipal bonds
296,271

 
2,116

 
(4,990
)
 
293,397

Mortgage-backed securities (1)
584,960

 
928

 
(15,561
)
 
570,327

Other
23,361

 
447

 
—

 
23,808

Total
$
1,283,161

 
$
4,635

 
$
(23,664
)
 
$
1,264,132

 
 
 
 
 
 
 
 
Held-to-maturity securities at amortized cost:
 
 
 
 
 
 
 
Mortgage-backed securities (1)
$
93,079

 
$
1

 
$
(476
)
 
$
92,604

Total
$
93,079

 
$
1

 
$
(476
)
 
$
92,604

_____________________
(1)
 All mortgage-backed securities are guaranteed by U.S. government agencies or government-sponsored entities.
The following table presents the maturities of available-for-sale investment securities, based on contractual maturity, as of June 30, 2017. 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
$
47,251

 
$
47,738

After one, but within five years
334,792

 
336,184

After five, but within ten years
334,083

 
327,470

Greater than ten years
481,045

 
477,328

Total
$
1,197,171

 
$
1,188,720


The following table presents the maturities of held-to-maturity investment securities, based on contractual maturity, as of June 30, 2017.
 
Held-to-maturity Securities
Amortized
cost
 
Fair
value
(In thousands)
Within one year
$
14,975

 
$
14,971

After one, but within five years
—

 
—

After five, but within ten years
14,327

 
14,300

Greater than ten years
69,722

 
69,442

Total
$
99,024

 
$
98,713


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 June 30,
 
Six months ended June 30,
2017
 
2016
 
2017
 
2016
(In thousands)
Proceeds from sales and calls
$
70,314

 
$
13,840

 
$
103,031

 
$
29,132

Realized gains
255

 
245

 
274

 
247

Realized losses
(18
)
 
—

 
(18
)
 
(1
)

The following tables present information regarding securities as of June 30, 2017 and December 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
June 30, 2017
 
 
 
 
 
 
 
 
 
 
 
 
 
Available-for-sale securities
(In thousands)
U.S. government and agencies
$
24,367

 
$
(587
)
 
$
292

 
$
(6
)
 
$
24,659

 
$
(593
)
 
4

Government-sponsored entities
97,093

 
(1,185
)
 
—

 
—

 
97,093

 
(1,185
)
 
15

Municipal bonds
74,816

 
(2,144
)
 
2,020

 
(43
)
 
76,836

 
(2,187
)
 
47

Mortgage-backed securities (1)
457,585

 
(9,874
)
 
45,366

 
(1,555
)
 
502,951

 
(11,429
)
 
103

Other
16

 
(5
)
 
—

 
—

 
16

 
(5
)
 
2

Total
$
653,877

 
$
(13,795
)
 
$
47,678

 
$
(1,604
)
 
$
701,555

 
$
(15,399
)
 
171

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Held-to-maturity securities
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agencies
14,971

 
(4
)
 
—

 
—

 
14,971

 
(4
)
 
4

Mortgage-backed securities (1)
$
66,362

 
$
(382
)
 
$
—

 
$
—

 
$
66,362

 
$
(382
)
 
13

Total
$
81,333

 
$
(386
)
 
$
—

 
$
—

 
$
81,333

 
$
(386
)
 
17


 
Less than 12 months
 
12 months or longer
 
Total
 
Fair
value
 
Unrealized
losses
 
Fair
value
 
Unrealized
losses
 
Fair
value
 
Unrealized
losses
 
# of
securities
 
(In thousands, except number of securities)
December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
 
 
Available-for-sale securities
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agencies
$
19,094

 
$
(838
)
 
$
643

 
$
(16
)
 
$
19,737

 
$
(854
)
 
4

Government-sponsored entities
125,412

 
(2,259
)
 
—

 
—

 
125,412

 
(2,259
)
 
18

Municipal bonds
182,395

 
(4,957
)
 
2,720

 
(33
)
 
185,115

 
(4,990
)
 
109

Mortgage-backed securities (1)
492,008

 
(13,988
)
 
41,544

 
(1,573
)
 
533,552

 
(15,561
)
 
99

Other
—

 
—

 
—

 
—

 
—

 
—

 
—

Total
$
818,909

 
$
(22,042
)
 
$
44,907

 
$
(1,622
)
 
$
863,816

 
$
(23,664
)
 
230

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Held-to-maturity securities
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities (1)
$
87,483

 
$
(476
)
 
$
—

 
$
—

 
$
87,483

 
$
(476
)
 
15

Total
$
87,483

 
$
(476
)
 
$
—

 
$
—

 
$
87,483

 
$
(476
)
 
15

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

As of June 30, 2017, the U.S. government and agencies securities in the table above had current Standard and Poor’s credit ratings of at least AA+. The mortgage-backed securities in the table above had current Standard and Poor’s credit ratings of at least AA. The municipal bonds in the table above had a current Standard and Poor’s credit rating of at least AA- or a current Moody’s credit rating of at least Aa2. The other securities consisted of equity securities. At June 30, 2017, the Company does not consider these investments other-than-temporarily impaired because the decline in fair value on investments is primarily attributed to changes in interest rates and not credit quality.
As of December 31, 2016, the U.S. government and agencies, and mortgage-backed securities in the table above had current Standard and Poor’s credit ratings of AAA. The municipal bonds in the table above had a current Standard and Poor’s credit rating of at least AA-. The other securities consisted of equity securities.
At June 30, 2017 and December 31, 2016, the amount of investment securities in an unrealized loss position greater than 12 months, as well as in total, was primarily due to changes in interest rates. As of June 30, 2017, the Company had no intent to sell any securities in an unrealized loss position and it is not more likely than not that the Company would be forced to sell any of these securities prior to the full recovery of all unrealized loss amounts.
Cost method investments, which are included in other assets, can be temporarily impaired when the fair values decline below the amortized costs of the individual investments. There were no cost method investments with unrealized losses as of June 30, 2017 or December 31, 2016. The Company’s cost method investments primarily include low income housing partnerships which generate tax credits. The Company also holds partnership interests in venture capital funds formed to provide financing to small businesses and to promote community development. The Company had $34.1 million and $34.2 million in cost method investments included in other assets as of June 30, 2017 and December 31, 2016, respectively.