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Interest Rate Swap Derivatives (Details Narrative)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Number
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
Number
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Notional amount $ 250,000       $ 250,000               $ 250,000 $ 250,000  
Designated cash flow hedge derivatives reclassified from accumulated oci into interest $ 23,869 $ 21,069 $ 18,086 $ 13,269 11,167 $ 10,434 $ 9,646 $ 8,900 $ 8,771 $ 7,703 $ 5,950 $ 5,216 $ 76,293 40,147 $ 27,640
Interest Rate Swap [Member]                              
Derivative, number of instruments held | Number 3                       3    
Notional amount $ 250,000       $ 250,000               $ 250,000 250,000  
Unrealized gain (loss) on derivatives                         3,700 2,300  
Derivative instruments, gain (loss) reclassified from accumulated oci into income, effective portion, net                         560 1,600  
Designated cash flow hedge derivatives reclassified from accumulated oci into interest $ 27,500                       3,700 $ 2,300  
Estimated amount to be reclassified to interest expense (based on existing interest rates) for cash flow hedges                         $ 2,000    
Estimate of time to transfer from AOCI to interest income/expense for designated cash flow hedge derivatives                         12 months