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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Securities Reconciliation
The following table presents amortized cost, gross unrealized gains and losses, and fair values of securities available-for-sale as of the dates indicated:
 
December 31, 2017
 
December 31, 2016
 
 
 
Gross
 
Gross
 
 
 
 
 
Gross
 
Gross
 
 
 
Amortized
 
Unrealized
 
Unrealized
 
Fair
 
Amortized
 
Unrealized
 
Unrealized
 
Fair
Security Type
Cost
 
Gains
 
Losses
 
Value
 
Cost
 
Gains
 
Losses
 
Value
 
(In thousands)
Residential MBS and CMOs:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Agency MBS
$
243,375

 
$
3,743

 
$
(844
)
 
$
246,274

 
$
499,185

 
$
6,222

 
$
(2,964
)
 
$
502,443

Agency CMOs
277,638

 
968

 
(2,897
)
 
275,709

 
145,258

 
1,528

 
(497
)
 
146,289

Private label CMOs
122,816

 
3,813

 
(642
)
 
125,987

 
122,707

 
4,199

 
(1,437
)
 
125,469

Municipal securities
1,627,707

 
53,700

 
(1,339
)
 
1,680,068

 
1,447,064

 
15,406

 
(6,011
)
 
1,456,459

Agency commercial MBS
1,169,969

 
2,758

 
(8,758
)
 
1,163,969

 
555,552

 
1,798

 
(9,658
)
 
547,692

Corporate debt securities
17,000

 
2,295

 
—

 
19,295

 
47,100

 
680

 
(271
)
 
47,509

Collateralized loan obligations
6,960

 
55

 
—

 
7,015

 
155,440

 
1,685

 
(238
)
 
156,887

SBA securities
160,214

 
695

 
(575
)
 
160,334

 
179,085

 
510

 
(750
)
 
178,845

Asset-backed and other securities
95,846

 
938

 
(1,004
)
 
95,780

 
62,264

 
358

 
(385
)
 
62,237

Total
$
3,721,525

 
$
68,965

 
$
(16,059
)
 
$
3,774,431

 
$
3,213,655

 
$
32,386

 
$
(22,211
)
 
$
3,223,830
Unrealized losses on investment securities
Unrealized Losses on Securities Available-for-Sale
The following tables present the gross unrealized losses and fair values of securities available-for-sale that were in unrealized loss positions, for which other-than-temporary impairments have not been recognized in earnings, as of the dates indicated:
 
December 31, 2017
 
Less Than 12 Months
 
12 Months or More
 
Total
 
 
 
Gross
 
 
 
Gross
 
 
 
Gross
 
Fair
 
Unrealized
 
Fair
 
Unrealized
 
Fair
 
Unrealized
Security Type
Value
 
Losses
 
Value
 
Losses
 
Value
 
Losses
 
(In thousands)
Residential MBS and CMOs:
 
 
 
 
 
 
 
 
 
 
 
Agency MBS
$
44,795

 
$
(311
)
 
$
26,010

 
$
(533
)
 
$
70,805

 
$
(844
)
Agency CMOs
163,014

 
(2,452
)
 
20,928

 
(445
)
 
183,942

 
(2,897
)
Private label CMOs
50,521

 
(500
)
 
5,035

 
(142
)
 
55,556

 
(642
)
Municipal securities
67,936

 
(365
)
 
32,326

 
(974
)
 
100,262

 
(1,339
)
Agency commercial MBS
579,373

 
(3,777
)
 
129,060

 
(4,981
)
 
708,433

 
(8,758
)
SBA securities
74,904

 
(575
)
 
—

 
—

 
74,904

 
(575
)
Asset-backed and other securities
46,237

 
(948
)
 
10,473

 
(56
)
 
56,710

 
(1,004
)
     Total
$
1,026,780

 
$
(8,928
)
 
$
223,832

 
$
(7,131
)
 
$
1,250,612

 
$
(16,059
)
 
December 31, 2016
 
Less Than 12 Months
 
12 Months or More
 
Total
 
 
 
Gross
 
 
 
Gross
 
 
 
Gross
 
Fair
 
Unrealized
 
Fair
 
Unrealized
 
Fair
 
Unrealized
Security Type
Value
 
Losses
 
Value
 
Losses
 
Value
 
Losses
 
(In thousands)
Residential MBS and CMOs:
 
 
 
 
 
 
 
 
 
 
 
Agency MBS
$
149,281

 
$
(1,691
)
 
$
122,902

 
$
(1,273
)
 
$
272,183

 
$
(2,964
)
Agency CMOs
44,111

 
(416
)
 
25,316

 
(81
)
 
69,427

 
(497
)
Private label CMOs
49,067

 
(906
)
 
30,155

 
(531
)
 
79,222

 
(1,437
)
Municipal securities
644,424

 
(6,011
)
 
—

 
—

 
644,424

 
(6,011
)
Agency commercial MBS
349,550

 
(9,658
)
 
—

 
—

 
349,550

 
(9,658
)
Corporate debt securities
29,829

 
(271
)
 
—

 
—

 
29,829

 
(271
)
Collateralized loan obligations
12,450

 
(37
)
 
39,231

 
(201
)
 
51,681

 
(238
)
SBA securities
69,293

 
(407
)
 
39,024

 
(343
)
 
108,317

 
(750
)
Asset-backed and other securities
18,213

 
(309
)
 
7,851

 
(76
)
 
26,064

 
(385
)
Total
$
1,366,218

 
$
(19,706
)
 
$
264,479

 
$
(2,505
)
 
$
1,630,697

 
$
(22,211
)
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.
 
December 31, 2017
 
Amortized
 
Fair
Maturity
Cost
 
Value
 
(In thousands)
Due in one year or less
$
14,398

 
$
15,091

Due after one year through five years
375,559

 
378,522

Due after five years through ten years
1,128,639

 
1,130,138

Due after ten years
2,202,929

 
2,250,680

Total securities available-for-sale
$
3,721,525

 
$
3,774,431
Investment Income
The following table presents the composition of our interest income on investment securities for the years indicated:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(In thousands)
Taxable interest
$
52,981

 
$
46,097

 
$
35,103

Non-taxable interest
43,355

 
41,885

 
25,219

Dividend income
1,866

 
2,575

 
4,046

Total interest income on investment securities
$
98,202

 
$
90,557

 
$
64,368