Deposits and Related Interest (Interest expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest Expense Domestic Deposit Liabilities [Abstract]
Demand and saving deposits	$ 17,724	$ 22,498	$ 11,232
Certificates of Deposits	16,230	18,479	18,417
Total	$ 33,954us-gaap_InterestExpenseDeposits	$ 40,977us-gaap_InterestExpenseDeposits	$ 29,649us-gaap_InterestExpenseDeposits

Aggregate amount of interest expense on all deposits.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.6)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 6

-Article 9

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- Definition

Amount of interest expense on domestic certificates of deposit liabilities.

+ References

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- Definition

The aggregate interest expense incurred on the following for deposits in domestic offices: (1) transaction accounts (NOW, and telephone and preauthorized transfer accounts), (2) money market deposits and (3) savings deposits.

+ References

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