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Derivative Instruments Schedule of Interest Rate Swaps by Maturity (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Derivative [Line Items]    
Derivative, Fair Value, Net $ 534 $ (5,628)
Interest Rate Swap [Member]    
Derivative [Line Items]    
Derivative notional 573,422 424,820
Derivative, Fair Value, Net $ 322 $ (4,508)
Weighted Average Pay Rate 1.76% 1.87%
Weighted Average Receive Rate 0.28% 0.23%
Weighted Average Years to Maturity 6 years 277 days 8 years 204 days
Year 2016 [Member] | Interest Rate Swap [Member]    
Derivative [Line Items]    
Derivative notional $ 48,000 $ 48,000
Derivative, Fair Value, Net $ (191) $ (91)
Weighted Average Pay Rate 0.80% 0.80%
Weighted Average Receive Rate 0.28% 0.23%
Weighted Average Years to Maturity 1 year 102 days 1 year 281 days
Year 2017 [Member] | Interest Rate Swap [Member]    
Derivative [Line Items]    
Derivative notional $ 74,750 $ 74,750
Derivative, Fair Value, Net $ (676) $ (388)
Weighted Average Pay Rate 1.21% 1.21%
Weighted Average Receive Rate 0.28% 0.24%
Weighted Average Years to Maturity 2 years 37 days 2 years 215 days
Year 2018 [Member] | Interest Rate Swap [Member]    
Derivative [Line Items]    
Derivative notional $ 71,529 $ 10,000
Derivative, Fair Value, Net $ (1) $ 167
Weighted Average Pay Rate 1.11% 0.84%
Weighted Average Receive Rate 0.28% 0.23%
Weighted Average Years to Maturity 2 years 288 days 3 years 120 days
Year 2020 [Member] | Interest Rate Swap [Member]    
Derivative [Line Items]    
Derivative notional $ 88,000 $ 23,500
Derivative, Fair Value, Net $ 96 $ 471
Weighted Average Pay Rate 1.62% 1.42%
Weighted Average Receive Rate 0.28% 0.23%
Weighted Average Years to Maturity 4 years 288 days 5 years 139 days
Year 2022 [Member] | Interest Rate Swap [Member]    
Derivative [Line Items]    
Derivative notional $ 27,700  
Derivative, Fair Value, Net $ 8  
Weighted Average Pay Rate 2.04%  
Weighted Average Receive Rate 0.28%  
Weighted Average Years to Maturity 6 years 299 days  
Year 2023 [Member] | Interest Rate Swap [Member]    
Derivative [Line Items]    
Derivative notional $ 131,164 $ 209,350
Derivative, Fair Value, Net $ 758 $ 140
Weighted Average Pay Rate 2.13% 2.13%
Weighted Average Receive Rate 0.28% 0.23%
Weighted Average Years to Maturity 7 years 329 days 8 years 146 days
Year 2024 [Member] | Interest Rate Swap [Member]    
Derivative [Line Items]    
Derivative notional $ 12,900 $ 12,900
Derivative, Fair Value, Net $ (474) $ (605)
Weighted Average Pay Rate 2.73% 2.73%
Weighted Average Receive Rate 0.28% 0.23%
Weighted Average Years to Maturity 8 years 347 days 9 years 164 days
Year 2025 [Member] | Interest Rate Swap [Member]    
Derivative [Line Items]    
Derivative notional $ 90,290  
Derivative, Fair Value, Net $ 1,737  
Weighted Average Pay Rate 2.21%  
Weighted Average Receive Rate 0.26%  
Weighted Average Years to Maturity 9 years 288 days  
Year 2043 [Member] | Interest Rate Swap [Member]    
Derivative [Line Items]    
Derivative notional $ 29,089 $ 46,320
Derivative, Fair Value, Net $ (935) $ (4,202)
Weighted Average Pay Rate 3.06% 3.12%
Weighted Average Receive Rate 0.28% 0.23%
Weighted Average Years to Maturity 27 years 329 days 28 years 153 days