Derivatives - Summary of Designated Derivative Instruments Classified as Derivative Assets (Details) $ in Thousands	Dec. 31, 2018 USD ($) Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair Market Value	$ 6,958
Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	1,381,615
Fair Market Value	$ (4,952)
Interest rate swaps | Interest rate swap, effective 5/21/2018, maturity 9/20/2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	1
Hedge Interest Rates	2.69%
Notional Amount	$ 80,453
Fair Market Value	$ (254)
Interest rate swaps | Interest rate swap, effective 4/29/2016, maturity 8/31/2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	1
Notional Amount	$ 13,660
Fair Market Value	$ 444
Interest rate swaps | Interest rate swap, effective 4/29/2016, maturity 8/31/2022 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Interest Rates	1.27%
Interest rate swaps | Interest rate swap, effective 4/29/2016, maturity 8/31/2022 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Interest Rates	2.37%
Interest rate swaps | Interest rate swap, effective 7/31/2017-1/31/2019, maturity 4/30/2024-10/31/2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	10
Notional Amount	$ 346,867
Fair Market Value	$ 3,201
Interest rate swaps | Interest rate swap, effective 7/31/2017-1/31/2019, maturity 4/30/2024-10/31/2024 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Interest Rates	2.16%
Interest rate swaps | Interest rate swap, effective 7/31/2017-1/31/2019, maturity 4/30/2024-10/31/2024 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Interest Rates	2.69%
Interest rate swaps | Interest rate swap, effective 4/30/2021, maturity 10/30/2026-10/31/2026
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	3
Notional Amount	$ 102,720
Fair Market Value	$ (1,895)
Interest rate swaps | Interest rate swap, effective 4/30/2021, maturity 10/30/2026-10/31/2026 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Interest Rates	2.89%
Interest rate swaps | Interest rate swap, effective 4/30/2021, maturity 10/30/2026-10/31/2026 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Interest Rates	3.08%
Interest rate swaps | Interest rate swap, effective 10/22/2018, maturity 9/20/2027
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	1
Hedge Interest Rates	2.97%
Notional Amount	$ 30,182
Fair Market Value	$ (669)
Interest rate swaps | Interest rate swap, effective 9/20/2020, maturity 6/20/2030
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	1
Hedge Interest Rates	2.57%
Notional Amount	$ 67,013
Fair Market Value	$ (95)
Interest rate swaps | Interest rate swap, effective 9/20/2020, maturity 1/20/2031
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	1
Hedge Interest Rates	2.61%
Notional Amount	$ 9,899
Fair Market Value	$ 57
Interest rate swaps | Interest rate swap, effective 1/31/2019-10/31/2024, maturity 7/31/2034
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	5
Notional Amount	$ 144,379
Fair Market Value	$ 1,049
Interest rate swaps | Interest rate swap, effective 1/31/2019-10/31/2024, maturity 7/31/2034 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Interest Rates	2.48%
Interest rate swaps | Interest rate swap, effective 1/31/2019-10/31/2024, maturity 7/31/2034 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Interest Rates	3.04%
Interest rate swaps | Interest rate swap, effective 7/31/2017-4/30/2024, maturity 7/31/2035
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	5
Notional Amount	$ 151,778
Fair Market Value	$ 658
Interest rate swaps | Interest rate swap, effective 7/31/2017-4/30/2024, maturity 7/31/2035 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Interest Rates	2.56%
Interest rate swaps | Interest rate swap, effective 7/31/2017-4/30/2024, maturity 7/31/2035 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Interest Rates	2.95%
Interest rate swaps | Interest rate swap, effective 1/31/2018-10/18/2024, maturity 10/31/2036
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	5
Notional Amount	$ 183,529
Fair Market Value	$ 648
Interest rate swaps | Interest rate swap, effective 1/31/2018-10/18/2024, maturity 10/31/2036 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Interest Rates	2.62%
Interest rate swaps | Interest rate swap, effective 1/31/2018-10/18/2024, maturity 10/31/2036 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Interest Rates	2.95%
Interest rate swaps | Interest rate swap, effective 1/31/2019-4/30/2021, maturity 4/30/2037
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	4
Notional Amount	$ 150,000
Fair Market Value	$ (7,268)
Interest rate swaps | Interest rate swap, effective 1/31/2019-4/30/2021, maturity 4/30/2037 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Interest Rates	3.25%
Interest rate swaps | Interest rate swap, effective 1/31/2019-4/30/2021, maturity 4/30/2037 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Interest Rates	3.30%
Interest rate swaps | Interest rate swap, effective 10/30/2026-10/31/2026, maturity 1/31/2038
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	3
Notional Amount	$ 101,135
Fair Market Value	$ (828)
Interest rate swaps | Interest rate swap, effective 10/30/2026-10/31/2026, maturity 1/31/2038 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Interest Rates	3.01%
Interest rate swaps | Interest rate swap, effective 10/30/2026-10/31/2026, maturity 1/31/2038 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Interest Rates	3.16%