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Investment Securities
 9 Months Ended
Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Investment Securities
Investment Securities
Investment securities available for sale consisted of the following at the dates indicated (in thousands):
 
September 30, 2015
 
Amortized Cost
 
Gross Unrealized
 
Fair Value
 
 
Gains
 
Losses
 
U.S. Treasury securities
$
54,947

 
$
339

 
$
—

 
$
55,286

U.S. Government agency and sponsored enterprise residential mortgage-backed securities
1,267,439

 
24,783

 
(461
)
 
1,291,761

U.S. Government agency and sponsored enterprise commercial mortgage-backed securities
91,325

 
1,763

 
—

 
93,088

Resecuritized real estate mortgage investment conduits (“Re-Remics”)
110,809

 
1,947

 
(22
)
 
112,734

Private label residential mortgage-backed securities and collateralized mortgage obligations ("CMOs")
494,572

 
50,969

 
(998
)
 
544,543

Private label commercial mortgage-backed securities
1,098,343

 
12,049

 
(2,438
)
 
1,107,954

Single family rental real estate-backed securities
578,743

 
136

 
(6,587
)
 
572,292

Collateralized loan obligations
309,595

 
150

 
(2,785
)
 
306,960

Non-mortgage asset-backed securities
57,284

 
1,950

 
—

 
59,234

Preferred stocks
75,823

 
9,253

 
—

 
85,076

State and municipal obligations
175,047

 
3,362

 
(218
)
 
178,191

Small Business Administration ("SBA") securities
242,340

 
4,298

 
(598
)
 
246,040

Other debt securities
3,818

 
4,469

 
—

 
8,287

 
$
4,560,085

 
$
115,468

 
$
(14,107
)
 
$
4,661,446

 
December 31, 2014
 
Amortized Cost
 
Gross Unrealized
 
Fair Value
 
 
Gains
 
Losses
 
U.S. Treasury securities
$
54,924

 
$
43

 
$
—

 
$
54,967

U.S. Government agency and sponsored enterprise residential mortgage-backed securities
1,501,504

 
29,613

 
(6,401
)
 
1,524,716

U.S. Government agency and sponsored enterprise commercial mortgage-backed securities
101,089

 
769

 
—

 
101,858

Re-Remics
179,664

 
3,613

 
(5
)
 
183,272

Private label residential mortgage-backed securities and CMOs
350,300

 
54,222

 
(543
)
 
403,979

Private label commercial mortgage-backed securities
1,156,166

 
10,254

 
(4,935
)
 
1,161,485

Single family rental real estate-backed securities
446,079

 
468

 
(3,530
)
 
443,017

Collateralized loan obligations
174,767

 
—

 
(435
)
 
174,332

Non-mortgage asset-backed securities
96,250

 
3,824

 
(6
)
 
100,068

Preferred stocks
96,294

 
9,148

 
—

 
105,442

State and municipal obligations
15,317

 
385

 
—

 
15,702

SBA securities
298,424

 
10,540

 
(236
)
 
308,728

Other debt securities
3,712

 
4,416

 
—

 
8,128

 
$
4,474,490

 
$
127,295

 
$
(16,091
)
 
$
4,585,694


Investment securities held to maturity at September 30, 2015 and December 31, 2014 consisted of one State of Israel bond with a carrying value of $10 million. Fair value approximated carrying value at September 30, 2015 and December 31, 2014. The bond matures in 2024.
At September 30, 2015, contractual maturities of investment securities available for sale, adjusted for anticipated prepayments of mortgage-backed and other pass-through securities, were as follows (in thousands): 
 
Amortized Cost
 
Fair Value
Due in one year or less
$
627,272

 
$
638,794

Due after one year through five years
2,299,502

 
2,337,361

Due after five years through ten years
1,090,732

 
1,114,166

Due after ten years
466,756

 
486,049

Preferred stocks with no stated maturity
75,823

 
85,076

 
$
4,560,085

 
$
4,661,446

Based on the Company’s proprietary assumptions, the estimated weighted average life of the investment portfolio as of September 30, 2015 was 3.9 years. The effective duration of the investment portfolio as of September 30, 2015 was 1.5 years. The model results are based on assumptions that may differ from actual results. 
The carrying value of securities pledged as collateral for Federal Home Loan Bank ("FHLB") advances, public deposits, interest rate swaps and to secure borrowing capacity at the Federal Reserve Bank ("FRB") totaled $1.2 billion and $1.0 billion at September 30, 2015 and December 31, 2014, respectively. 
The following table provides information about gains and losses on investment securities available for sale for the periods indicated (in thousands): 
 
Three Months Ended  
 September 30,
 
Nine Months Ended 
 September 30,
 
2015
 
2014
 
2015
 
2014
Proceeds from sale of investment securities available for sale
$
324,536


$
83,536

 
$
799,450

 
$
203,360

 
 
 
 
 
 
 
 
Gross realized gains
$
2,343

 
$
795

 
$
5,968

 
$
2,075

Gross realized losses
—

 
—

 
(475
)
 
(919
)
Gain on investment securities available for sale, net
$
2,343

 
$
795

 
$
5,493

 
$
1,156


The following tables present the aggregate fair value and the aggregate amount by which amortized cost exceeded fair value for investment securities in unrealized loss positions, aggregated by investment category and length of time that individual securities had been in continuous unrealized loss positions at the dates indicated (in thousands): 
 
September 30, 2015
 
Less than 12 Months
 
12 Months or Greater
 
Total
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
U.S. Government agency and sponsored enterprise residential mortgage-backed securities
$
1,276

 
$
(6
)
 
$
105,195

 
$
(455
)
 
$
106,471

 
$
(461
)
Re-Remics
8,004

 
(22
)
 
—

 
—

 
8,004

 
(22
)
Private label residential mortgage-backed securities and CMOs
54,758

 
(721
)
 
11,715

 
(277
)
 
66,473

 
(998
)
Private label commercial mortgage-backed securities
271,225

 
(2,101
)
 
62,726

 
(337
)
 
333,951

 
(2,438
)
Single family rental real estate-backed securities
308,633

 
(2,107
)
 
213,699

 
(4,480
)
 
522,332

 
(6,587
)
Collateralized loan obligations
222,653

 
(2,175
)
 
49,390

 
(610
)
 
272,043

 
(2,785
)
State and municipal obligations
14,927

 
(218
)
 
—

 
—

 
14,927

 
(218
)
SBA securities
25,613

 
(598
)
 
—

 
—

 
25,613

 
(598
)
 
$
907,089

 
$
(7,948
)
 
$
442,725

 
$
(6,159
)
 
$
1,349,814

 
$
(14,107
)
 
December 31, 2014
 
Less than 12 Months
 
12 Months or Greater
 
Total
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
U.S. Government agency and sponsored enterprise residential mortgage-backed securities
$
7,058

 
$
(34
)
 
$
300,057

 
$
(6,367
)
 
$
307,115

 
$
(6,401
)
Re-Remics
—

 
—

 
335

 
(5
)
 
335

 
(5
)
Private label residential mortgage-backed securities and CMOs
60,076

 
(189
)
 
14,653

 
(354
)
 
74,729

 
(543
)
Private label commercial mortgage-backed securities
103,900

 
(1,150
)
 
239,456

 
(3,785
)
 
343,356

 
(4,935
)
Single family rental real estate-backed securities
233,012

 
(3,530
)
 
—

 
—

 
233,012

 
(3,530
)
Collateralized loan obligations
49,565

 
(435
)
 
—

 
—

 
49,565

 
(435
)
Non-mortgage asset-backed securities
2,796

 
(6
)
 
—

 
—

 
2,796

 
(6
)
SBA securities
49,851

 
(236
)
 
—

 
—

 
49,851

 
(236
)
 
$
506,258

 
$
(5,580
)
 
$
554,501

 
$
(10,511
)
 
$
1,060,759

 
$
(16,091
)

The Company monitors its investment securities available for sale for other-than-temporary impairment ("OTTI") on an individual security basis. No securities were determined to be other-than-temporarily impaired during the nine months ended September 30, 2015 or 2014.  The Company does not intend to sell securities that are in significant unrealized loss positions and it is not more likely than not that the Company will be required to sell these securities before recovery of the amortized cost basis, which may be at maturity. At September 30, 2015, 47 securities were in unrealized loss positions. The amount of impairment related to eight of these securities was considered insignificant, totaling approximately $76 thousand and no further analysis with respect to these securities was considered necessary. The basis for concluding that impairment of the remaining securities was not other-than-temporary is further described below: 
U.S. Government agency and sponsored enterprise residential mortgage-backed securities:
At September 30, 2015, three U.S. Government agency and sponsored enterprise residential mortgage-backed securities were in unrealized loss positions. The unrealized losses were primarily attributable to an increase in medium and long-term market interest rates subsequent to the date the securities were acquired. The amount of impairment of each of the individual securities was 3% or less of amortized cost.  The timely payment of principal and interest on these securities is explicitly or implicitly guaranteed by the U.S. Government. Given the limited severity of impairment and the expectation of timely payment of principal and interest, the impairments were considered to be temporary.
Private label residential mortgage-backed securities and CMOs:
At September 30, 2015, five private label residential mortgage-backed securities were in unrealized loss positions.  The unrealized losses were primarily due to widening credit spreads and an increase in medium and long-term market rates subsequent to acquisition. These securities were assessed for OTTI using credit and prepayment behavioral models that incorporate CUSIP level constant default rates, voluntary prepayment rates and loss severity and delinquency assumptions.  The results of these assessments were not indicative of credit losses that would result in the Company recovering less than its amortized cost basis related to any of these securities as of September 30, 2015. Given the limited severity of impairment and the expectation of timely recovery of outstanding principal, the impairments were considered to be temporary.
Private label commercial mortgage-backed securities:
At September 30, 2015, eleven private label commercial mortgage-backed securities were in unrealized loss positions. The unrealized losses were primarily attributable to widening credit spreads and for certain securities, an increase in medium and long-term market interest rates subsequent to acquisition. The amount of impairment of each of the individual securities was 1% or less of amortized cost.  These securities were assessed for OTTI using credit and prepayment behavioral models incorporating assumptions consistent with the collateral characteristics of each security.  The results of this analysis were not indicative of expected credit losses.  Given the limited severity of impairment and the expectation of timely recovery of outstanding principal, the impairments were considered to be temporary.
Single family rental real estate-backed securities:
At September 30, 2015, thirteen single family rental real estate-backed securities were in unrealized loss positions. The unrealized losses were primarily due to widening credit spreads, leading to increased extension risk. The amount of impairment of each of the individual securities was 2% or less of amortized cost.  Management's analysis of the credit characteristics, including loan-to-value and debt service coverage ratios, and levels of subordination for each of the securities is not indicative of projected credit losses. Given the limited severity of impairment and the absence of projected credit losses, the impairments were considered to be temporary.
Collateralized loan obligations:
At September 30, 2015, four collateralized loan obligations were in unrealized loss positions, due to widening credit spreads. The amount of impairment of each of the individual securities was less than 2% of amortized cost. Given the limited severity of impairment, levels of subordination and the results of independent analyses of the credit quality of loans underlying the securities, the impairments were considered to be temporary.
State and municipal obligations:
At September 30, 2015, two state and municipal obligations were in unrealized loss positions. These securities had been in unrealized loss positions for less than six months and the amount of impairment of each of the individual securities was less than 2% of amortized cost. Given the limited severity and duration of impairment and the results of independent credit surveillance, the impairments were considered to be temporary.
SBA securities:
At September 30, 2015, one SBA security was in an unrealized loss position. The amount of impairment was 2% of amortized cost and was attributable primarily to increased prepayment speeds. The timely payment of principal and interest on this security is guaranteed by this U.S. Government agency. Given the limited severity of impairment and the expectation of timely payment of principal and interest, the impairment was considered to be temporary.