Borrowings - Line of Credit and other disclosures (Details) $ in Thousands	Dec. 31, 2015 USD ($)
Long-term borrowings
Unused line of credit	$ 264,980
FHLB
Long-term borrowings
Unused line of credit	102,980
FRB
Long-term borrowings
Unused line of credit	15,030
Federal Funds Agreements
Long-term borrowings
Unused line of credit	65,000
Repurchase Lines of Credit
Long-term borrowings
Unused line of credit	50,000
Non-Recourse Revolving Bank Line of Credit
Long-term borrowings
Unused line of credit	$ 31,970

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Subparagraph b
-Article 5

Name:	us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant