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Derivative Financial Instruments (Location and Fair Value of Derivative Instruments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Derivatives not designated as hedging instruments, fair value |  |
Fair value of interest rate swaps | $ 8,337 | $ 4,637
Interest rate swap contracts not designated as hedging instruments - liabilities, gross | 8,337 | 4,637
Effective portion of interest rate cash flow hedge, Fair Value included in accumulated other comprehensive income | 1,093 | 142
Interest Rate Cash Flow Hedge Asset at Fair Value | $ 1,093 |
Interest Rate Cash Flow Hedge Liability at Fair Value |  | $ 142
Accrued interest receivable and other assets |  |
Derivatives not designated as hedging instruments, fair value |  |
Description of location of interest rate derivative instruments not designated as hedging instruments on balance sheet | Accrued interest receivable and other assets | Accrued interest receivable and other assets
Description of Location of Interest Rate Cash Flow Hedge Derivative on Balance Sheet | Accumulated other comprehensive income (1) |
Accrued interest payable and other liabilities |  |
Derivatives not designated as hedging instruments, fair value |  |
Description of location of interest rate derivative instruments not designated as hedging instruments on balance sheet | Accrued interest payable and other liabilities | Accrued interest payable and other liabilities
Description of Location of Interest Rate Cash Flow Hedge Derivative on Balance Sheet |  | Accrued interest payable and other liabilities
Accumulated other comprehensive income |  |
Derivatives not designated as hedging instruments, fair value |  |
Description of Location of Interest Rate Cash Flow Hedge Derivative on Balance Sheet | Accrued interest payable and other liabilities | Accumulated other comprehensive income (1)

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