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Derivative Activities (Interest rate swap and their term) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Interest rate swap designated as cash flow hedges
  
Derivative [Line Items]  
Amount $ 265,277
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 40,277
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 16,594
Interest rate swaps not designated as hedges - offered to clients
  
Derivative [Line Items]  
Amount $ 16,594