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Investment Securities (Tables)
 12 Months Ended
Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Investments by contractual maturity date
September 30,
2015
 
Amortized
Cost
 
Gross Unrealized    
 
Fair
Value
 
Yield
Gains
 
Losses
 
 
(In thousands)
Available-for-sale securities
 
 
 
 
 
 
 
 
 
U.S. government and agency securities due
 
 
 
 
 
 
 
 
 
1 to 5 years
$
105,065

 
$
1,923

 
$
(274
)
 
$
106,714

 
1.74
%
5 to 10 years
119,071

 
35

 
(1,247
)
 
117,859

 
1.54
%
Over 10 years
262,832

 
—

 
(4,941
)
 
257,891

 
1.23
%
Equity Securities
 
 
 
 
 
 
 
 
 
Within 1 year
500

 
17

 
—

 
517

 
1.80
%
1 to 5 years
99,922

 
1,513

 
—

 
101,435

 
1.90
%
5 to 10 years
—

 
—

 
—

 
—

 
—
%
Corporate bonds due
 
 
 
 
 
 
 
 
 
Within 1 year
24,787

 
191

 
—

 
24,978

 
0.53
%
1 to 5 years
311,435

 
1,190

 
(58
)
 
312,567

 
0.88
%
5 to 10 years
100,000

 
876

 
(3,524
)
 
97,352

 
1.47
%
  Over 10 years
69,950

 
953

 
—

 
70,903

 
3.00
%
Municipal bonds due
 
 
 
 
 
 
 
 
 
1 to 5 years
2,285

 
8

 
—

 
2,293

 
1.23
%
5 to 10 years
1,303

 
7

 
—

 
1,310

 
2.05
%
  Over 10 years
20,382

 
3,138

 
—

 
23,520

 
6.45
%
Mortgage-backed securities
 
 
 
 
 
 
 
 
 
Agency pass-through certificates
1,144,787

 
18,222

 
(2,491
)
 
1,160,518

 
2.48
%
Other commercial MBS
103,131

 
85

 
(510
)
 
102,706

 
1.51
%
 
2,365,450

 
28,158

 
(13,045
)
 
2,380,563

 
1.97
%
Held-to-maturity securities
 
 
 
 
 
 
 
 
 
Mortgage-backed securities

 

 

 

 

Agency pass-through certificates
1,643,216

 
10,516

 
(16,312
)
 
1,637,420

 
3.19
%
 
1,643,216

 
10,516

 
(16,312
)
 
1,637,420

 
3.19
%
 
$
4,008,666

 
$
38,674

 
$
(29,357
)
 
$
4,017,983

 
2.46
%
 
 
 
 
 
 
 

 
 
September 30,
2014
 
Amortized
Cost
 
Gross Unrealized
 
Fair
Value
 
Yield
 
Gains
 
Losses
 
 
(In thousands)
Available-for-sale securities
 
 
 
 
 
 
 
 
 
U.S. government and agency securities due
 
 
 
 
 
 
 
 
 
1 to 5 years
$
171,154

 
$
2,585

 
$
(748
)
 
$
172,991

 
1.26
%
5 to 10 years
203,317

 
300

 
(102
)
 
203,515

 
1.45
%
Over 10 years
354,828

 
1,028

 
(419
)
 
355,437

 
1.25
%
Equity Securities
 
 
 
 
 
 
 
 
 
Within 1 year
 
 
 
 
 
 
 
 
 
1 to 5 years
100,500

 
887

 
—

 
101,387

 
1.90
%
  5 to 10 years
—

 
 
 
—

 
—

 
—
%
Corporate bonds due

 

 

 

 

Within 1 year
15,000

 
75

 
—

 
15,075

 
1.00
%
1 to 5 years
302,540

 
2,372

 
—

 
304,912

 
0.71
%
5 to 10 years
138,201

 
1,789

 
(970
)
 
139,020

 
1.43
%
Over 10 years
50,000

 
—

 
—

 
50,000

 
3.00
%
Municipal bonds due

 

 

 

 

1 to 5 years
—

 
—

 
—

 
—

 
—
%
5 to 10 years
—

 
—

 
—

 
—

 
—
%
  Over 10 years
20,402

 
3,279

 
—

 
23,681

 
6.45
%
Mortgage-backed securities

 

 

 

 

Agency pass-through certificates
1,561,639

 
24,893

 
(2,024
)
 
1,584,508

 
2.57
%
Other commercial MBS
98,851

 
65

 
—

 
98,916

 
1.49
%
 
3,016,432

 
37,273

 
(4,263
)
 
3,049,442

 
1.99
%
Held-to-maturity securities
 
 
 
 
 
 
 
 
 
Mortgage-backed securities

 

 

 

 

Agency pass-through certificates
1,548,265

 
4,855

 
(53,902
)
 
1,499,218

 
3.13
%
 
1,548,265

 
4,855

 
(53,902
)
 
1,499,218

 
3.13
%
 
$
4,564,697

 
$
42,128

 
$
(58,165
)
 
$
4,548,660

 
2.38
%
Schedule of unrealized losses and fair value of securities
The following table shows the gross unrealized losses and fair value of securities at September 30, 2015 and September 30, 2014, by length of time that individual securities in each category have been in a continuous loss position. The Bank had $1,297,408,000 securities in a continuous loss position for 12 or more months at September 30, 2015, and $1,642,718,000 securities in a continuous loss position for 12 or more months at September 30, 2014, which consisted of corporate bonds, U.S. government and agency securities, and mortgage-backed securities. Management believes that the declines in fair value of these investments are not an other than temporary impairment as these losses are due to a change in interest rates rather than any credit deterioration. The impairment is also deemed to be temporary because: 1) the Bank does not intend to sell the security, and 2) it is not more likely than not that it will be required to sell the security before recovery of the entire amortized cost basis of the security.
 
As of September 30,
2015
  
Less than 12 months
12 months or more
Total
  
Unrealized
Gross Losses
Fair
Value
Unrealized
Gross Losses
Fair
Value
Unrealized
Gross Losses
Fair
Value
 
(In thousands)
Corporate Bonds
$
(183
)
$
72,862

$
(3,399
)
$
46,601

$
(3,582
)
$
119,463

U.S. agency securities
(5,010
)
336,243

(1,452
)
57,344

(6,462
)
393,587

Agency pass-through certificates
(1,036
)
169,541

(18,277
)
1,193,463

(19,313
)
1,363,004

 
$
(6,229
)
$
578,646

$
(23,128
)
$
1,297,408

$
(29,357
)
$
1,876,054




As of September 30,
2014
  
Less than 12 months
12 months or more
Total
  
Unrealized
Gross Losses
Fair
Value
Unrealized
Gross Losses
Fair
Value
Unrealized
Gross Losses
Fair
Value
 
(In thousands)
Corporate Bonds
$
(125
)
$
24,875

$
(845
)
$
24,155

$
(970
)
$
49,030

U.S. agency securities
(472
)
316,578

(797
)
109,354

(1,269
)
425,932

Agency pass-through certificates
(215
)
19,212

(55,711
)
1,509,209

(55,926
)
1,528,421

 
$
(812
)
$
360,665

$
(57,353
)
$
1,642,718

$
(58,165
)
$
2,003,383