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Fair Values of Financial Instruments (Tables)
 12 Months Ended
Sep. 30, 2012
Fair Value of Financial Instruments [Abstract]  
Fair value of financial instruments by balance sheet grouping
 
 
2012
2011
  
Level in Fair Value Hierarchy
Carrying
Amount
Estimated
Fair Value
Carrying
Amount
Estimated
Fair Value
 
 
(In thousands)
Financial assets
 
 
 
 
 
Cash and cash equivalents
1
$
751,430

$
751,430

$
816,002

$
816,002

Available-for-sale securities:
2


 
 
Equity securities
 


—

—

—

Obligations of U.S. government
 
183,560

183,560

190,527

190,527

Obligations of states and political subdivisions
 
24,844

24,844

23,568

23,568

Obligations of foreign governments
 
—

—

—

—

Corporate debt securities
 
403,325

403,325

29,959

29,959

Mortgage-backed securities
 


 
 
Agency pass-through certificates
 
1,169,976

1,169,976

3,011,090

3,011,090

Other debt securities
 
—

—

—

—

Total available-for-sale securities
 
1,781,705

1,781,705

3,255,144

3,255,144

Held-to-maturity securities:
2
 
 
 
 
Equity securities
 
—

—

—

—

Obligations of U.S. government
 
—

—

—

—

Obligations of states and political subdivisions
 
795

802

1,950

2,023

Obligations of foreign governments
 
—

—

—

—

Corporate debt securities
 
—

—

—

—

Mortgage-backed securities
 


 
 
Agency pass-through certificates
 
1,190,692

1,216,421

45,086

48,593

Other debt securities
 
—

—

—

—

Total held-to-maturity securities
 
1,191,487

1,217,223

47,036

50,616

Loans receivable
3
7,451,998

7,949,892

7,935,877

8,479,307

Covered loans
3
288,376

289,754

382,183

375,027

FDIC indemnification asset
3
87,571

85,846

98,871

101,751

FHLB stock
2
149,840

149,840

151,755

151,755

Financial liabilities
 


 
 
Customer accounts
2
8,576,618

8,406,432

8,665,903

8,557,357

FHLB advances and other borrowings
2
1,880,000

2,110,223

2,762,066

3,038,127