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Derivatives (Details 6) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Derivatives Assets    
Gross Amounts including Contracts Not Subject to Master Netting Arrangement $ 69,809 $ 83,780
Contracts Not Subject to Master Netting Arrangements 44,570 51,218
Gross Amounts 25,239 32,562
Gross Amounts Offset on the Consolidated Balance Sheets 0 0
Net Amounts Presented on the Consolidated Balance Sheets 25,239 32,562
Gross Amounts Not Offset on the Consolidated Balance Sheets    
Derivative Amount (20,964) (20,991)
Collateral Received (4,162) (10,687)
Net Amount 113 884
Cash collateral received 1,000 8,100
Derivatives Liabilities    
Gross Amounts including Contracts Not Subject to Master Netting Arrangement 74,356 82,323
Contracts Not Subject to Master Netting Arrangements 22,699 24,097
Gross Amounts 51,657 58,226
Gross Amounts Offset on the Consolidated Balance Sheets 0 0
Net Amounts Presented on the Consolidated Balance Sheets 51,657 58,226
Gross Amounts Not Offset on the Consolidated Balance Sheets    
Derivative Amount (20,964) (20,991)
Collateral Posted (29,833) (36,349)
Net Amount 860 886
Cash collateral posted $ 1,200 $ 170