Derivative Instruments (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 31, 2019 USD ($)	Sep. 30, 2019 USD ($) contract	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) contract	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) contract
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense		$ 25,791	$ 23,133	$ 76,644	$ 66,189
Interest Rate Derivatives [Abstract]
Number of interest rate swaps | contract		2		2
Fair value		$ 345		$ 345		$ 4,649
Reclassification during next 12 months		500		500
Termination value		300		300
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense		25,791	23,133	76,644	66,189
Interest Rate Swap
Interest Rate Derivatives [Abstract]
Aggregate notional amount		65,100		65,100		$ 66,800
Interest Rate Swap | Other Comprehensive Income (Loss) | Designated as Hedging Instrument | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain related to the effective portion recognized in other comprehensive (loss) income		13	$ 69	424	$ 619
Interest Rate Lock Commitments
Interest Rate Derivatives [Abstract]
Number of interest rate swaps | contract						2
Aggregate notional amount						$ 200,000
Gain (loss) on contract termination	$ 5,700
Interest Rate Lock Agreement A
Interest Rate Derivatives [Abstract]
Aggregate notional amount						100,000
Derivative, gain on derivative						$ 2,400
Number of derivative instruments expired | contract						1
Interest Rate Lock Agreement B
Interest Rate Derivatives [Abstract]
Aggregate notional amount	100,000
Derivative, gain on derivative	$ 3,300
Other Liabilities | Interest Rate Swap
Interest Rate Derivatives [Abstract]
Fair value		345		345		$ 677
Other Liabilities | Interest Rate Lock Commitments
Interest Rate Derivatives [Abstract]
Fair value		$ 0		$ 0		$ 3,972