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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

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