Derivative Activities (Interest rate swap and their term) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Interest rate swap designated as cash flow hedges
Derivative [Line Items]
Amount	$ 264,317
Interest rate swap designated as cash flow hedges \| Rate 2.4365% [Member]
Derivative [Line Items]
Amount	25,000
Fixed rate	2.4365%
Trade Date	May 05, 2011
Settlement Date	May 04, 2012
Maturity Date	May 04, 2016
Interest rate swap designated as cash flow hedges \| Rate 2.6200% [Member]
Derivative [Line Items]
Amount	25,000
Fixed rate	2.62%
Trade Date	May 05, 2011
Settlement Date	Jul. 24, 2012
Maturity Date	Jul. 24, 2016
Interest rate swap designated as cash flow hedges \| Rate 2.6350% [Member]
Derivative [Line Items]
Amount	25,000
Fixed rate	2.635%
Trade Date	May 05, 2011
Settlement Date	Jul. 30, 2012
Maturity Date	Jul. 30, 2016
Interest rate swap designated as cash flow hedges \| Rate 2.6590% [Member]
Derivative [Line Items]
Amount	50,000
Fixed rate	2.659%
Trade Date	May 05, 2011
Settlement Date	Aug. 10, 2012
Maturity Date	Aug. 10, 2016
Interest rate swap designated as cash flow hedges \| Rate 2.6750% [Member]
Derivative [Line Items]
Amount	100,000
Fixed rate	2.675%
Trade Date	May 05, 2011
Settlement Date	Aug. 16, 2012
Maturity Date	Aug. 16, 2016
Interest rate swap designated as cash flow hedges \| Rate 2.4210% [Member]
Derivative [Line Items]
Amount	39,317
Fixed rate	2.421%
Trade Date	Jul. 03, 2013
Settlement Date	Jul. 03, 2013
Maturity Date	Aug. 01, 2023
Interest rate swaps not designated as hedges - offered to clients
Derivative [Line Items]
Amount	16,457
Interest rate swaps not designated as hedges - offered to clients
Derivative [Line Items]
Amount	$ 16,457

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

The settlement date of an investment contract.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Average fixed interest rate related to the group of interest rate derivatives.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date the entity entered into the derivative contract, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Period Type:	duration

- Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration

- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Data Type:	xbrli:dateItemType
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- Details

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- Details

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Namespace Prefix:
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- Details

Name:	us-gaap_DerivativeByNatureAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
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