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Investments (Tables)
 6 Months Ended
Jun. 30, 2014
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
The following table presents amortized cost, gross unrealized gains and losses, and carrying values of securities available-for-sale. As of June 30, 2014 and December 31, 2013, our investment securities, available-for-sale were as follows:
 
June 30, 2014
 
December 31, 2013
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
 
(In thousands)
Residential mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Government agency and
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
government-sponsored enterprise
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
pass through securities
$
563,820

 
$
21,382

 
$
(445
)
 
$
584,757

 
$
691,944

 
$
18,012

 
$
(2,768
)
 
$
707,188

Government agency and
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
government-sponsored enterprise
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
collateralized mortgage obligations
286,347

 
2,766

 
(1,509
)
 
287,604

 
197,069

 
388

 
(4,584
)
 
192,873

Covered private label collateralized
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
mortgage obligations
28,913

 
7,709

 
(100
)
 
36,522

 
30,502

 
7,552

 
(150
)
 
37,904

Other private label collateralized
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
mortgage obligations
14,287

 
9

 
(8
)
 
14,288

 
—

 
—

 
—

 
—

Municipal securities
453,890

 
9,286

 
(6,610
)
 
456,566

 
459,182

 
1,749

 
(24,273
)
 
436,658

Corporate debt securities
107,669

 
1,789

 
(67
)
 
109,391

 
84,119

 
71

 
(1,483
)
 
82,707

Government-sponsored enterprise debt
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
securities
36,198

 
467

 
—

 
36,665

 
10,046

 
—

 
(174
)
 
9,872

Other securities
26,301

 
45

 
(24
)
 
26,322

 
27,654

 
2

 
(113
)
 
27,543

Total
$
1,517,425

 
$
43,453

 
$
(8,763
)
 
$
1,552,115

 
$
1,500,516

 
$
27,774

 
$
(33,545
)
 
$
1,494,745
Unrealized losses on investment securities
Unrealized Losses on Investment Securities
As of June 30, 2014 and December 31, 2013, the gross unrealized losses and fair values of investment securities that were in unrealized loss positions, for which other-than-temporary impairments have not been recognized in earnings, were as follows:
 
June 30, 2014
 
Less Than 12 Months
 
12 Months or More
 
Total
 
Fair Value
 
Gross Unrealized Losses
 
Fair Value
 
Gross Unrealized Losses
 
Fair Value
 
Gross Unrealized Losses
 
(In thousands)
Residential mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
Government agency and government-
 
 
 
 
 
 
 
 
 
 
 
sponsored enterprise pass through
 
 
 
 
 
 
 
 
 
 
 
securities
$
954

 
$
(2
)
 
$
42,325

 
$
(443
)
 
$
43,279

 
$
(445
)
Government agency and government-
 
 
 
 
 
 
 
 
 
 
 
sponsored enterprise collateralized
 
 
 
 
 
 
 
 
 
 
 
mortgage obligations
95,351

 
(374
)
 
42,971

 
(1,135
)
 
138,322

 
(1,509
)
Covered private label collateralized
 
 
 
 
 
 
 
 
 
 
 
mortgage obligations
—

 
—

 
1,088

 
(100
)
 
1,088

 
(100
)
Other private label collateralized
 
 
 
 
 
 
 
 
 
 
 
mortgage obligations
6,809

 
(8
)
 
—

 
—

 
6,809

 
(8
)
Municipal securities
9,655

 
(10
)
 
206,241

 
(6,600
)
 
215,896

 
(6,610
)
Corporate debt securities
22,219

 
(29
)
 
2,795

 
(38
)
 
25,014

 
(67
)
Government-sponsored enterprise debt
 
 
 
 
 
 
 
 
 
 
 
securities
—

 
—

 
—

 
—

 
—

 
—

Other securities
—

 
—

 
10,029

 
(24
)
 
10,029

 
(24
)
     Total
$
134,988

 
$
(423
)
 
$
305,449

 
$
(8,340
)
 
$
440,437

 
$
(8,763
)

 
December 31, 2013
 
Less Than 12 Months
 
12 Months or More
 
Total
 
Fair Value
 
Gross Unrealized Losses
 
Fair Value
 
Gross Unrealized Losses
 
Fair Value
 
Gross Unrealized Losses
 
(In thousands)
Residential mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 
 
Government agency and government-
 
 
 
 
 
 
 
 
 
 
 
sponsored enterprise pass through
 
 
 
 
 
 
 
 
 
 
 
securities
$
148,662

 
$
(2,767
)
 
$
32

 
$
(1
)
 
$
148,694

 
$
(2,768
)
Government agency and government-
 
 
 
 
 
 
 
 
 
 
 
sponsored enterprise collateralized
 
 
 
 
 
 
 
 
 
 
 
mortgage obligations
179,938

 
(4,486
)
 
4,383

 
(98
)
 
184,321

 
(4,584
)
Covered private label collateralized
 
 
 
 
 
 
 
 
 
 
 
mortgage obligations
1,640

 
(60
)
 
617

 
(90
)
 
2,257

 
(150
)
Municipal securities
337,208

 
(24,273
)
 
—

 
—

 
337,208

 
(24,273
)
Corporate debt securities
72,636

 
(1,483
)
 
—

 
—

 
72,636

 
(1,483
)
Government-sponsored enterprise debt
 
 
 
 
 
 
 
 
 
 
 
securities
9,872

 
(174
)
 
—

 
—

 
9,872

 
(174
)
Other securities
23,969

 
(113
)
 
—

 
—

 
23,969

 
(113
)
Total
$
773,925

 
$
(33,356
)
 
$
5,032

 
$
(189
)
 
$
778,957

 
$
(33,545
)
Investments Classified by Contractual Maturity Date
The following table presents the contractual maturities of our available-for-sale securities portfolio based on amortized cost and carrying value as of the date indicated.
 
June 30, 2014
 
Amortized Cost
 
Estimated Fair Value
 
(In thousands)
Due in one year or less
$
2,803

 
$
2,804

Due after one year through five years
58,523

 
58,864

Due after five years through ten years
264,647

 
268,537

Due after ten years
1,191,452

 
1,221,910

Total securities available-for-sale
$
1,517,425

 
$
1,552,115
Investment Income [Table Text Block]
The following table presents the composition of our interest income on investment securities:
 
Three Months Ended
 
Six Months Ended June 30,
 
June 30, 2014
 
March 31, 2014
 
June 30, 2013
 
2014
 
2013
 
(In thousands)
Taxable interest
$
7,668

 
$
6,920

 
$
5,388

 
$
14,584

 
$
10,951

Non-taxable interest
3,333

 
3,328

 
2,716

 
6,661

 
5,141

Dividend income
985

 
575

 
310

 
1,564

 
538

Total interest income on investment securities
$
11,986

 
$
10,823

 
$
8,414

 
$
22,809

 
$
16,630