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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
Dec. 31, 2018
Dec. 31, 2017
Other assets    
Derivative Assets [Abstract]    
Gross Amounts of Recognized Assets $ 22,874 $ 6,530
Gross Amounts Offset in the Balance Sheet 3,991 893
Net Amounts of Assets Presented in the Balance Sheet 18,883 5,637
Collateral 0 0
Net Amount 18,883 5,637
Other assets | Interest rate futures    
Derivative Assets [Abstract]    
Gross Amounts of Recognized Assets 2,361 684
Gross Amounts Offset in the Balance Sheet 1,660 524
Net Amounts of Assets Presented in the Balance Sheet 701 160
Collateral 0 0
Net Amount 701 160
Other assets | Interest rate swaps    
Derivative Assets [Abstract]    
Gross Amounts of Recognized Assets 860 424
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Assets Presented in the Balance Sheet 860 424
Collateral 0 0
Net Amount 860 424
Other assets | Foreign currency forward contracts    
Derivative Assets [Abstract]    
Gross Amounts of Recognized Assets 16,459 3,865
Gross Amounts Offset in the Balance Sheet 2,260 358
Net Amounts of Assets Presented in the Balance Sheet 14,199 3,507
Collateral 0 0
Net Amount 14,199 3,507
Other assets | Foreign currency forward contracts    
Derivative Assets [Abstract]    
Gross Amounts of Recognized Assets 3,194 39
Gross Amounts Offset in the Balance Sheet 71 11
Net Amounts of Assets Presented in the Balance Sheet 3,123 28
Collateral 0 0
Net Amount 3,123 28
Other assets | Credit default swaps    
Derivative Assets [Abstract]    
Gross Amounts of Recognized Assets   1,518
Gross Amounts Offset in the Balance Sheet   0
Net Amounts of Assets Presented in the Balance Sheet   1,518
Collateral   0
Net Amount   1,518
Other liabilities    
Derivative Liabilities [Abstract]    
Gross Amounts of Recognized Liabilities 8,225 1,536
Gross Amounts Offset in the Balance Sheet 1,741 535
Net Amounts of Liabilities Presented in the Balance Sheet 6,484 1,001
Collateral Pledged 2,076 227
Net Amount 4,408 774
Other liabilities | Interest rate futures    
Derivative Liabilities [Abstract]    
Gross Amounts of Recognized Liabilities 1,887 729
Gross Amounts Offset in the Balance Sheet 1,670 524
Net Amounts of Liabilities Presented in the Balance Sheet 217 205
Collateral Pledged 217 205
Net Amount 0 0
Other liabilities | Interest rate swaps    
Derivative Liabilities [Abstract]    
Gross Amounts of Recognized Liabilities 506  
Gross Amounts Offset in the Balance Sheet 0  
Net Amounts of Liabilities Presented in the Balance Sheet 506  
Collateral Pledged 254  
Net Amount 252  
Other liabilities | Foreign currency forward contracts    
Derivative Liabilities [Abstract]    
Gross Amounts of Recognized Liabilities 4,154 670
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Balance Sheet 4,154 670
Collateral Pledged 0 0
Net Amount 4,154 670
Other liabilities | Foreign currency forward contracts    
Derivative Liabilities [Abstract]    
Gross Amounts of Recognized Liabilities 72 115
Gross Amounts Offset in the Balance Sheet 71 11
Net Amounts of Liabilities Presented in the Balance Sheet 1 104
Collateral Pledged 0 0
Net Amount 1 104
Other liabilities | Credit default swaps    
Derivative Liabilities [Abstract]    
Gross Amounts of Recognized Liabilities 1,606 22
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts of Liabilities Presented in the Balance Sheet 1,606 22
Collateral Pledged 1,605 22
Net Amount $ 1 $ 0