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Investments (Tables)
 12 Months Ended
Dec. 31, 2015
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)
At 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

At December 31, 2014:
 
 
 
 
 
 
 
Available-for-sale securities at fair value:
 
 
 
 
 
 
 
U.S. government and agencies
$
16,894

 
$
32

 
$
(44
)
 
$
16,882

Government-sponsored entities
273,538

 
983

 
(268
)
 
274,253

Municipal bonds
232,415

 
3,268

 
(435
)
 
235,248

Mortgage-backed securities (1)
284,403

 
2,191

 
(2,890
)
 
283,704

Other
19,608

 
309

 
(11
)
 
19,906

Total
$
826,858

 
$
6,783

 
$
(3,648
)
 
$
829,993

Held-to-maturity securities at amortized cost:
 
 
 
 
 
 
 
Mortgage-backed securities (1)
$
140,727

 
$
1,638

 
$
(26
)
 
$
142,339

Total
$
140,727

 
$
1,638

 
$
(26
)
 
$
142,339

_________________
(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, and the weighted average yields of such securities as of December 31, 2015:
 
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
$
—

 
$
—

 
—
%
 
$
19,324

 
$
19,336

 
0.86
%
After one, but within five years
21,214

 
21,251

 
1.63
%
 
250,526

 
251,018

 
1.51
%
After five, but within ten years
—

 
—

 
—
%
 
75,183

 
74,208

 
1.94
%
Greater than ten years
—

 
—

 
—
%
 
—

 
—

 
—
%
Total
$
21,214

 
$
21,251

 
1.63
%
 
$
345,033

 
$
344,562

 
1.57
%
 
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
$
21,153

 
$
21,237

 
2.10
%
 
$
—

 
$
—

 
—
%
After one, but within five years
92,649

 
93,316

 
2.14
%
 
3,087

 
3,118

 
2.44
%
After five, but within ten years
41,403

 
42,074

 
2.99
%
 
20,591

 
21,109

 
3.14
%
Greater than ten years
108,456

 
112,017

 
4.28
%
 
407,768

 
402,814

 
2.02
%
Total
$
263,661

 
$
268,644

 
3.15
%
 
$
431,446

 
$
427,041

 
2.08
%
 
Other (4)
Amortized
cost
 
Fair
value
 
Weighted
average
yield
(In thousands)
Within one year
$
22,751

 
$
23,012

 
—
%
After one, but within five years
—

 
—

 
—
%
After five, but within ten years
—

 
—

 
—
%
Greater than ten years
—

 
—

 
—
%
Total
$
22,751

 
$
23,012

 
—
%
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, 2015:
 
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
—

 
—

 
—
%
Greater than ten years
116,352

 
116,384

 
2.26
%
Total
$
116,352

 
$
116,384

 
2.26
%
___________________
(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)
Yield shown on a fully taxable equivalent (“FTE”) basis.
(4)
Other securities consist of money market mutual funds and equity securities held at 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,
2015
 
2014
 
2013
(In thousands)
Proceeds from sales
$
34,160

 
$
6,450

 
$
4,062

Realized gains
272

 
16

 
49

Realized losses
(36
)
 
(23
)
 
—
Schedule of Unrealized Loss on Investments [Table Text Block]
The following table presents information regarding securities at December 31, 2015 and 2014 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, 2015
 
 
 
 
 
 
 
 
 
 
 
 
 
Available-for-sale securities
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agencies
$
4,935

 
$
(18
)
 
$
1,001

 
$
(9
)
 
$
5,936

 
$
(27
)
 
3

Government-sponsored entities
167,691

 
(1,345
)
 
—

 
—

 
167,691

 
(1,345
)
 
24

Municipal bonds
14,483

 
(43
)
 
3,173

 
(73
)
 
17,656

 
(116
)
 
12

Mortgage-backed securities (1)
318,156

 
(3,486
)
 
62,753

 
(2,248
)
 
380,909

 
(5,734
)
 
68

Other
47

 
(4
)
 
11

 
(3
)
 
58

 
(7
)
 
6

Total
$
505,312

 
$
(4,896
)
 
$
66,938

 
$
(2,333
)
 
$
572,250

 
$
(7,229
)
 
113

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Held-to-maturity securities
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities (1)
$
40,606

 
$
(262
)
 
$
—

 
$
—

 
$
40,606

 
$
(262
)
 
5

Total
$
40,606

 
$
(262
)
 
$
—

 
$
—

 
$
40,606

 
$
(262
)
 
5

 
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, 2014
 
 
 
 
 
 
 
 
 
 
 
 
 
Available-for-sale securities
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agencies
$
10,364

 
$
(4
)
 
$
632

 
$
(40
)
 
$
10,996

 
$
(44
)
 
2

Government-sponsored entities
51,980

 
(99
)
 
28,957

 
(169
)
 
80,937

 
(268
)
 
8

Municipal bonds
62,871

 
(255
)
 
15,473

 
(180
)
 
78,344

 
(435
)
 
41

Mortgage-backed securities (1)
56,711

 
(192
)
 
91,133

 
(2,698
)
 
147,844

 
(2,890
)
 
34

Other
74

 
(11
)
 
—

 
—

 
74

 
(11
)
 
7

Total
$
182,000

 
$
(561
)
 
$
136,195

 
$
(3,087
)
 
$
318,195

 
$
(3,648
)
 
92

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Held-to-maturity securities
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities (1)
$
13,871

 
$
(26
)
 
$
—

 
$
—

 
$
13,871

 
$
(26
)
 
1

Total
$
13,871

 
$
(26
)
 
$
—

 
$
—

 
$
13,871

 
$
(26
)
 
1

___________________
(1)
All mortgage-backed securities are guaranteed by U.S. government agencies or Government-sponsored entities.
The U.S. government and agencies securities, government-sponsored entities securities, and mortgage-backed securities in the table above had Standard and Poor’s credit ratings of AA+. The municipal bonds in the table above had Standard and Poor’s credit ratings of AA-. The other securities consisted of equity securities. At December 31, 2015, 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.
At December 31, 2015 and 2014, 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. The Company has no intent to sell any securities in an unrealized loss position at December 31, 2015 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. Subsequent to December 31, 2015 and through the date of the filing of this Annual Report on Form 10-K, no securities were downgraded to below investment grade, nor were any securities in an unrealized loss position sold.
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, 2015:
 
Amortized cost
 
Fair value
(In thousands)
Government National Mortgage Association
$
111,340

 
$
109,627

Federal Home Loan Mortgage Corporation
171,582

 
171,450

Federal Home Loan Bank
103,806

 
103,251

Federal National Mortgage Association
368,690

 
366,356

Total
$
755,418

 
$
750,684