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Loans (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) contract	Dec. 31, 2015 USD ($)
Financing Receivable, Recorded Investment [Line Items]
Loans to related parties	$ 9,900	$ 10,000
Loans and Leases Receivable, Related Parties, Additions	55
Repayments on related party loans	$ 100
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract	0
Loans Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	$ 2,210,000	2,220,000
Federal Reserve Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	$ 50,200	$ 50,100

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- Definition

Federal Reserve Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged

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- Definition

Amount of the collateral pledged in support of federal home loan bank advances outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

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-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953682-111524

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(e))
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Reflects the amount of new advances made to related parties in the form of loan and lease receivables.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(e))
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Reflects the amount of collections received from related parties to reduce the carrying amounts of loans and leases receivable due from them.

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-Name Accounting Standards Codification
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