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Investments (Tables)
 9 Months Ended
Sep. 30, 2017
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, 2017
 
 
 
 
 
 
 
Available-for-sale securities at fair value:
 
 
 
 
 
 
 
U.S. government and agencies
$
35,129

 
$
24

 
$
(590
)
 
$
34,563

Government-sponsored entities
305,210

 
789

 
(1,143
)
 
304,856

Municipal bonds
301,436

 
4,900

 
(1,829
)
 
304,507

Mortgage-backed securities (1)
539,064

 
739

 
(10,180
)
 
529,623

Other
15,796

 
485

 
(3
)
 
16,278

Total
$
1,196,635

 
$
6,937

 
$
(13,745
)
 
$
1,189,827

 
 
 
 
 
 
 
 
Held-to-maturity securities at amortized cost:
 
 
 
 
 
 
 
U.S. government and agencies
$
4,996

 
$
—

 
$
—

 
$
4,996

Mortgage-backed securities (1)
79,094

 
89

 
(301
)
 
78,882

Total
$
84,090

 
$
89

 
$
(301
)
 
$
83,878

 
 
 
 
 
 
 
 
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.
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, 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
$
60,984

 
$
61,511

After one, but within five years
342,959

 
344,253

After five, but within ten years
321,379

 
315,209

Greater than ten years
471,313

 
468,854

Total
$
1,196,635

 
$
1,189,827


The following table presents the maturities of held-to-maturity investment securities, based on contractual maturity, as of September 30, 2017.
 
Held-to-maturity Securities
Amortized
cost
 
Fair
value
(In thousands)
Within one year
$
4,996

 
$
4,996

After one, but within five years
—

 
—

After five, but within ten years
13,418

 
13,409

Greater than ten years
65,676

 
65,473

Total
$
84,090

 
$
83,878
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,
2017
 
2016
 
2017
 
2016
(In thousands)
Proceeds from sales and calls
$
16,207

 
$
12,829

 
$
119,238

 
$
41,961

Realized gains
235

 
273

 
509

 
520

Realized losses
(5
)
 
—

 
(23
)
 
(1
)
Schedule of Unrealized Loss on Investments [Table Text Block]
The following tables present information regarding securities as of September 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
September 30, 2017
 
 
 
 
 
 
 
 
 
 
 
 
 
Available-for-sale securities
(In thousands)
U.S. government and agencies
$
14,883

 
$
(129
)
 
$
9,690

 
$
(461
)
 
$
24,573

 
$
(590
)
 
4

Government-sponsored entities
101,977

 
(818
)
 
10,351

 
(325
)
 
112,328

 
(1,143
)
 
16

Municipal bonds
42,281

 
(399
)
 
40,093

 
(1,430
)
 
82,374

 
(1,829
)
 
45

Mortgage-backed securities (1)
265,098

 
(3,376
)
 
219,521

 
(6,804
)
 
484,619

 
(10,180
)
 
99

Other
21

 
(3
)
 
—

 
—

 
21

 
(3
)
 
2

Total
$
424,260

 
$
(4,725
)
 
$
279,655

 
$
(9,020
)
 
$
703,915

 
$
(13,745
)
 
166

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Held-to-maturity securities
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities (1)
$
54,384

 
$
(239
)
 
$
4,008

 
$
(62
)
 
$
58,392

 
$
(301
)
 
11

Total
$
54,384

 
$
(239
)
 
$
4,008

 
$
(62
)
 
$
58,392

 
$
(301
)
 
11


 
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.