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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
Jun. 30, 2018
Dec. 31, 2017
Other assets    
Derivative Assets    
Gross Amounts of Recognized Assets $ 9,562 $ 6,530
Gross Amounts Offset in the Balance Sheet 86 893
Net Amounts of Assets Presented in the Balance Sheet 9,476 5,637
Collateral 0 0
Net Amount 9,476 5,637
Other assets | Interest rate futures    
Derivative Assets    
Gross Amounts of Recognized Assets 81 684
Gross Amounts Offset in the Balance Sheet 81 524
Net Amounts of Assets Presented in the Balance Sheet 0 160
Collateral 0 0
Net Amount 0 160
Other assets | Interest rate swaps    
Derivative Assets    
Gross Amounts of Recognized Assets 573 424
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Assets Presented in the Balance Sheet 573 424
Collateral 0 0
Net Amount 573 424
Other assets | Foreign currency forward contracts, underwriting and non-investment operations    
Derivative Assets    
Gross Amounts of Recognized Assets 6,687 3,865
Gross Amounts Offset in the Balance Sheet 0 358
Net Amounts of Assets Presented in the Balance Sheet 6,687 3,507
Collateral 0 0
Net Amount 6,687 3,507
Other assets | Foreign currency forward contracts, investment operations    
Derivative Assets    
Gross Amounts of Recognized Assets 1,759 39
Gross Amounts Offset in the Balance Sheet 5 11
Net Amounts of Assets Presented in the Balance Sheet 1,754 28
Collateral 0 0
Net Amount 1,754 28
Other assets | Credit default swaps    
Derivative Assets    
Gross Amounts of Recognized Assets 462 1,518
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Assets Presented in the Balance Sheet 462 1,518
Collateral 0 0
Net Amount 462 1,518
Other liabilities    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 13,869 1,536
Gross Amounts Offset in the Balance Sheet 2,232 535
Net Amounts of Liabilities Presented in the Balance Sheet 11,637 1,001
Collateral Pledged 95 227
Net Amount 11,542 774
Other liabilities | Interest rate futures    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 176 729
Gross Amounts Offset in the Balance Sheet 81 524
Net Amounts of Liabilities Presented in the Balance Sheet 95 205
Collateral Pledged 95 205
Net Amount 0 0
Other liabilities | Foreign currency forward contracts, underwriting and non-investment operations    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 13,100 670
Gross Amounts Offset in the Balance Sheet 2,146 0
Net Amounts of Liabilities Presented in the Balance Sheet 10,954 670
Collateral Pledged 0 0
Net Amount 10,954 670
Other liabilities | Foreign currency forward contracts, investment operations    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities 593 115
Gross Amounts Offset in the Balance Sheet 5 11
Net Amounts of Liabilities Presented in the Balance Sheet 588 104
Collateral Pledged 0 0
Net Amount $ 588 104
Other liabilities | Credit default swaps    
Derivative Liabilities    
Gross Amounts of Recognized Liabilities   22
Gross Amounts Offset in the Balance Sheet   0
Net Amounts of Liabilities Presented in the Balance Sheet   22
Collateral Pledged   22
Net Amount   $ 0