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Derivative Instruments (Consolidated Balance Sheets and Fair Value of the Principal Derivative Instruments) (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Other assets    
Derivative Assets    
Gross Amounts of Recognized Assets $ 9,460 $ 6,530
Gross Amounts Offset in the Balance Sheet 224 893
Net Amounts of Assets Presented in the Balance Sheet 9,236 5,637
Collateral 0 0
Net Amount 9,236 5,637
Other assets | Interest rate futures    
Derivative Assets    
Gross Amounts of Recognized Assets 438 684
Gross Amounts Offset in the Balance Sheet 184 524
Net Amounts of Assets Presented in the Balance Sheet 254 160
Collateral 0 0
Net Amount 254 160
Other assets | Interest rate swaps    
Derivative Assets    
Gross Amounts of Recognized Assets 782 424
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Assets Presented in the Balance Sheet 782 424
Collateral 0 0
Net Amount 782 424
Other assets | Foreign currency forward contracts, underwriting and non-investment operations    
Derivative Assets    
Gross Amounts of Recognized Assets 6,547 3,865
Gross Amounts Offset in the Balance Sheet 0 358
Net Amounts of Assets Presented in the Balance Sheet 6,547 3,507
Collateral 0 0
Net Amount 6,547 3,507
Other assets | Foreign currency forward contracts, investment operations    
Derivative Assets    
Gross Amounts of Recognized Assets 1,416 39
Gross Amounts Offset in the Balance Sheet 40 11
Net Amounts of Assets Presented in the Balance Sheet 1,376 28
Collateral 0 0
Net Amount 1,376 28
Other assets | Credit default swaps    
Derivative Assets    
Gross Amounts of Recognized Assets 277 1,518
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Assets Presented in the Balance Sheet 277 1,518
Collateral 0 0
Net Amount 277 1,518
Other liabilities    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 8,370 1,536
Gross Amounts Offset in the Balance Sheet 728 535
Net Amounts of Liabilities Presented in the Balance Sheet 7,642 1,001
Collateral Pledged 237 227
Net Amount 7,405 774
Other liabilities | Interest rate futures    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 189 729
Gross Amounts Offset in the Balance Sheet 184 524
Net Amounts of Liabilities Presented in the Balance Sheet 5 205
Collateral Pledged 5 205
Net Amount 0 0
Other liabilities | Interest rate swaps    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 232  
Gross Amounts Offset in the Balance Sheet 0  
Net Amounts of Liabilities Presented in the Balance Sheet 232  
Collateral Pledged 232  
Net Amount 0  
Other liabilities | Foreign currency forward contracts, underwriting and non-investment operations    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 7,272 670
Gross Amounts Offset in the Balance Sheet 504 0
Net Amounts of Liabilities Presented in the Balance Sheet 6,768 670
Collateral Pledged 0 0
Net Amount 6,768 670
Other liabilities | Foreign currency forward contracts, investment operations    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 663 115
Gross Amounts Offset in the Balance Sheet 40 11
Net Amounts of Liabilities Presented in the Balance Sheet 623 104
Collateral Pledged 0 0
Net Amount 623 104
Other liabilities | Credit default swaps    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 14 22
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Balance Sheet 14 22
Collateral Pledged 0 22
Net Amount $ 14 $ 0