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Loans Receivable - Interest Rate Terms (Details) $ in Thousands	Sep. 30, 2016 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at fixed-rate	$ 6,952,290
Loans at adjustable-rate	3,998,318
Within 1 year
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at fixed-rate	29,428
Loans at adjustable-rate	1,362,480
1 to 3 years
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at fixed-rate	326,859
Loans at adjustable-rate	1,457,584
3 to 5 years
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at fixed-rate	192,202
Loans at adjustable-rate	552,402
5 to 10 years
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at fixed-rate	693,099
Loans at adjustable-rate	625,852
10 to 20 years
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at fixed-rate	1,020,654
Loans at adjustable-rate	0
Over 20 years
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at fixed-rate	4,690,048
Loans at adjustable-rate	$ 0

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+ References

No definition available.

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- Definition

Amount of loan with fixed rate of interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522

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- Definition

Amount of loan with variable or adjustable rate of interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
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