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INVESTMENT SECURITIES (Tables)
 9 Months Ended
Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Summary of Amortized Cost and Fair Value of Available-for-Sale Investment Securities
The following table presents the amortized cost and fair value of the investment securities portfolio as of the dates indicated: 
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
(In thousands)
September 30, 2015
 
 
 
 
 
 
 
Held to maturity
 
 
 
 
 
 
 
Corporate bonds
$
239,079

 
$
875

 
$
(2,919
)
 
$
237,035

Collateralized loan obligations
290,453

 
55

 
(585
)
 
289,923

Total securities held to maturity
$
529,532

 
$
930

 
$
(3,504
)
 
$
526,958

Available for sale
 
 
 
 
 
 
 
SBA loan pool securities
$
1,485

 
$
31

 
$
—

 
$
1,516

U.S. government-sponsored entities and agency securities
1,949

 
52

 
—

 
2,001

Private label residential mortgage-backed securities
1,904

 
15

 
(2
)
 
1,917

Corporate bonds
26,662

 
—

 
(415
)
 
26,247

Commercial mortgage-backed securities
114,361

 
904

 
(31
)
 
115,234

Agency mortgage-backed securities
544,182

 
2,253

 
(131
)
 
546,304

Total securities available for sale
$
690,543

 
$
3,255

 
$
(579
)
 
$
693,219

December 31, 2014
 
 
 
 
 
 
 
Available for sale
 
 
 
 
 
 
 
SBA loan pool securities
$
1,697

 
$
18

 
$
—

 
$
1,715

U.S. government-sponsored entities and agency securities
1,940

 
42

 
—

 
1,982

Private label residential mortgage-backed securities
3,169

 
12

 
(13
)
 
3,168

Agency mortgage-backed securities
338,072

 
1,363

 
(605
)
 
338,830

Total securities available for sale
$
344,878

 
$
1,435

 
$
(618
)
 
$
345,695
Summary of Amortized Cost and Fair Value of Available-for-Sale Investment Securities Portfolio by Maturity Date
The following table presents amortized cost and fair value of the held to maturity and available for sale investment securities portfolio by expected maturity. In the case of mortgage-backed securities, collateralized loan obligations, and SBA loan pool securities, expected maturities may differ from contractual maturities because borrowers generally have the right to call or prepay obligations with or without call or prepayment penalties. For that reason, mortgage-backed securities, collateralized loan obligations, and SBA loan pool securities are not included in the maturity categories. 
 
September 30, 2015
Held To Maturity
 
Available For Sale
Amortized
Cost
 
Fair
Value
 
Amortized
Cost
 
Fair
Value
 
(In thousands)
Maturity:
 
 
 
 
 
 
 
Within one year
$
—

 
$
—

 
$
—

 
$
—

One to five years
—

 
—

 
1,949

 
2,001

Five to ten years
186,438

 
184,615

 
26,662

 
26,247

Greater than ten years
52,641

 
52,420

 
—

 
—

Collateralized loan obligations, SBA loan pool, private label residential mortgage-backed, commercial mortgage-backed, and agency mortgage-backed securities
290,453

 
289,923

 
661,932

 
664,971

Total
$
529,532

 
$
526,958

 
$
690,543

 
$
693,219
Proceeds from Sales and Calls of Securities and Associated Gross Gains and Losses
The following table presents proceeds from sales and calls of securities and the associated gross gains and losses realized through earnings upon the sale of available for sale securities for the periods indicated: 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
2015
 
2014
 
2015
 
2014
 
(In thousands)
Gross realized gains on sales of securities available for sale
$
1,750

 
$
—

 
$
1,750

 
$
560

Gross realized losses on sales of securities available for sale
—

 
—

 
(2
)
 
(38
)
Net realized gains on sales of securities available for sale
$
1,750

 
$
—

 
$
1,748

 
$
522

Proceeds from sales of securities available for sale
$
403,032

 
$
—

 
$
403,206

 
$
52,245

Tax benefit on sales of securities available for sale
$
736

 
$
—

 
$
735

 
$
—
Summary of Investment Securities with Unrealized Losses
The following table summarizes the investment securities with unrealized losses by security type and length of time in a continuous unrealized loss position as of the dates indicated: 
 
Less Than 12 Months
 
12 Months or Longer
 
Total
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
 
(In thousands)
September 30, 2015
 
 
 
 
 
 
 
 
 
 
 
Held to maturity
 
 
 
 
 
 
 
 
 
 
 
Corporate bonds
$
147,632

 
$
(2,919
)
 
$
—

 
$
—

 
$
147,632

 
$
(2,919
)
Collateralized loan obligation
198,800

 
(585
)
 
—

 
—

 
198,800

 
(585
)
Total securities held to maturity
$
346,432

 
$
(3,504
)
 
$
—

 
$
—

 
$
346,432

 
$
(3,504
)
Available for sale
 
 
 
 
 
 
 
 
 
 
 
Private label residential mortgage-backed securities
$
—

 
$
—

 
$
442

 
$
(2
)
 
$
442

 
$
(2
)
Corporate bonds
19,747

 
(415
)
 
—

 
—

 
19,747

 
(415
)
Commercial mortgage-backed securities
33,949

 
(31
)
 
—

 
—

 
33,949

 
(31
)
Agency mortgage-backed securities
15,226

 
(69
)
 
7,246

 
(62
)
 
22,472

 
(131
)
Total securities available for sale
$
68,922

 
$
(515
)
 
$
7,688

 
$
(64
)
 
$
76,610

 
$
(579
)
December 31, 2014
 
 
 
 
 
 
 
 
 
 
 
Available for sale
 
 
 
 
 
 
 
 
 
 
 
Private label residential mortgage-backed securities
$
372

 
$
(9
)
 
$
1,355

 
$
(4
)
 
$
1,727

 
$
(13
)
Agency mortgage-backed securities
68,200

 
(332
)
 
22,212

 
(273
)
 
90,412

 
(605
)
Total securities available for sale
$
68,572

 
$
(341
)
 
$
23,567

 
$
(277
)
 
$
92,139

 
$
(618
)