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Investments (Tables)
 12 Months Ended
Dec. 31, 2017
Investments [Abstract]  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
The following tables present a summary of investment securities:
 
Amortized
Cost
 
Unrealized
 
Fair
Value
Gains
 
Losses
 
(In thousands)
At December 31, 2017:
 
 
 
 
 
 
 
Available-for-sale securities at fair value:
 
 
 
 
 
 
 
U.S. government and agencies
$
35,132

 
$
—

 
$
(833
)
 
$
34,299

Government-sponsored entities
305,101

 
22

 
(2,622
)
 
302,501

Municipal bonds
299,647

 
4,559

 
(1,148
)
 
303,058

Mortgage-backed securities (1)
521,753

 
491

 
(12,568
)
 
509,676

Other
20,794

 
—

 
—

 
20,794

Total
$
1,182,427

 
$
5,072

 
$
(17,171
)
 
$
1,170,328

 
 
 
 
 
 
 
 
Held-to-maturity securities at amortized cost:
 
 
 
 
 
 
 
Mortgage-backed securities (1)
$
74,576

 
$
—

 
$
(795
)
 
$
73,781

Total
$
74,576

 
$
—

 
$
(795
)
 
$
73,781

 
Amortized
Cost
 
Unrealized
 
Fair
Value
Gains
 
Losses
 
(In thousands)
At 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 tables present the maturities of available-for-sale investment securities, based on contractual maturity, and the weighted average yields of such securities as of December 31, 2017:
 
U.S. government and agencies (1)
 
Government-sponsored entities (1)
Amortized
cost
 
Fair
value
 
Weighted
average
yield
 
Amortized
cost
 
Fair
value
 
Weighted
average
yield
(In thousands)
Within one year
$
—

 
$
—

 
—
%
 
$
44,033

 
$
43,967

 
1.39
%
After one, but within five years
15,192

 
15,105

 
1.53
%
 
224,747

 
223,315

 
1.86
%
After five, but within ten years
19,940

 
19,194

 
1.73
%
 
36,321

 
35,219

 
2.05
%
Greater than ten years
—

 
—

 
—
%
 
—

 
—

 
—
%
Total
$
35,132

 
$
34,299

 
1.64
%
 
$
305,101

 
$
302,501

 
1.81
%
 
Municipal bonds (1)
 
Mortgage-backed securities (2)
Amortized
cost
 
Fair
value
 
Weighted
average
yield (3)
 
Amortized
cost
 
Fair
value
 
Weighted
average
yield
(In thousands)
Within one year
$
15,770

 
$
15,756

 
1.85
%
 
$
17

 
$
17

 
2.33
%
After one, but within five years
57,178

 
57,260

 
2.63
%
 
11,460

 
11,407

 
2.25
%
After five, but within ten years
33,979

 
34,719

 
3.73
%
 
236,360

 
229,770

 
2.18
%
Greater than ten years
192,720

 
195,323

 
4.07
%
 
273,916

 
268,482

 
2.10
%
Total
$
299,647

 
$
303,058

 
3.64
%
 
$
521,753

 
$
509,676

 
2.14
%
 
Other (4)
Amortized
cost
 
Fair
value
 
Weighted
average
yield
(In thousands)
Within one year
$
20,794

 
$
20,794

 
—
%
After one, but within five years
—

 
—

 
—
%
After five, but within ten years
—

 
—

 
—
%
Greater than ten years
—

 
—

 
—
%
Total
$
20,794

 
$
20,794

 
—
%
The following table presents the maturities of held-to-maturity investment securities, based on contractual maturity, and the weighted average yields of such securities as of December 31, 2017:
 
Mortgage-backed securities (2)
Amortized
cost
 
Fair
value
 
Weighted
average
yield
(In thousands)
Within one year
$
—

 
$
—

 
—
%
After one, but within five years
—

 
—

 
—
%
After five, but within ten years
16,722

 
16,551

 
2.17
%
Greater than ten years
57,854

 
57,230

 
2.30
%
Total
$
74,576

 
$
73,781

 
2.27
%
___________________
(1)
Certain securities are callable before their final maturity. 
(2)
Mortgage-backed securities are shown based on their final (contractual) maturity, but, due to prepayments, they are expected to have shorter lives.
(3)
Yields shown on a fully taxable equivalent (“FTE”) basis. The tax rate used in the table above was the tax rate in effect on December 31, 2017. The recent enactment of the Tax Act will reduce the rate applied in future periods, which will result in a lower FTE yield.
(4)
Other securities consist of money market mutual funds and equity securities held by certain Wealth Advisory and Investment Management businesses.
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 investment securities that were sold during the following years:
 
Year Ended December 31,
2017
 
2016
 
2015
(In thousands)
Proceeds from sales
$
148,407

 
$
50,049

 
$
34,160

Realized gains
519

 
522

 
272

Realized losses
(143
)
 
(1
)
 
(36
)
Schedule of Unrealized Loss on Investments [Table Text Block]
The following tables present information regarding securities at December 31, 2017 and 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
 
(In thousands, except number of securities)
December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 
 
Available-for-sale securities
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agencies
$
14,902

 
$
(79
)
 
$
19,397

 
$
(754
)
 
$
34,299

 
$
(833
)
 
6

Government-sponsored entities
220,275

 
(1,350
)
 
38,273

 
(1,272
)
 
258,548

 
(2,622
)
 
36

Municipal bonds
46,112

 
(131
)
 
50,842

 
(1,017
)
 
96,954

 
(1,148
)
 
63

Mortgage-backed securities (1)
97,117

 
(903
)
 
386,785

 
(11,665
)
 
483,902

 
(12,568
)
 
103

Total
$
378,406

 
$
(2,463
)
 
$
495,297

 
$
(14,708
)
 
$
873,703

 
$
(17,171
)
 
208

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Held-to-maturity securities
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities (1)
$
59,218

 
$
(534
)
 
$
14,563

 
$
(261
)
 
$
73,781

 
$
(795
)
 
16

Total
$
59,218

 
$
(534
)
 
$
14,563

 
$
(261
)
 
$
73,781

 
$
(795
)
 
16

 
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

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.
Concentration Risk Disclosure [Text Block]
The following table presents the concentration of securities with any one issuer that exceeds ten percent of shareholders’ equity as of December 31, 2017:
 
Amortized cost
 
Fair value
(In thousands)
Government National Mortgage Association
$
104,188

 
$
101,941

Federal Home Loan Mortgage Corporation
349,926

 
342,374

Federal Home Loan Bank
163,151

 
161,747

Federal National Mortgage Association
259,108

 
255,143

Total
$
876,373

 
$
861,205