Derivatives - Summary of Derivative Instruments (Details) - Interest rate swaps $ in Thousands	Jun. 30, 2018 USD ($) Instrument
Interest rate swap, 9/20/2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	1
Hedge interest rates	2.69%
Notional amount	$ 110,242
Derivative liability, fair market value	$ (165)
Interest rate swap, 8/31/2022 - 9/30/2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	2
Notional amount	$ 25,726
Derivative asset, fair market value	$ 826
Interest rate swap, 8/31/2022 - 9/30/2022 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	1.27%
Interest rate swap, 8/31/2022 - 9/30/2022 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.37%
Interest rate swap, 4/30/2024 - 10/31/2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	10
Notional amount	$ 342,631
Derivative asset, fair market value	$ 9,241
Interest rate swap, 4/30/2024 - 10/31/2024 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.16%
Interest rate swap, 4/30/2024 - 10/31/2024 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.69%
Interest rate swap, 10/30/2026 - 10/31/2026
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	3
Notional amount	$ 102,720
Derivative liability, fair market value	$ (426)
Interest rate swap, 10/30/2026 - 10/31/2026 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.89%
Interest rate swap, 10/30/2026 - 10/31/2026 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	3.08%
Interest rate swap, 10/31/2028
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	4
Notional amount	$ 124,492
Derivative asset, fair market value	$ 5,581
Interest rate swap, 10/31/2028 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.17%
Interest rate swap, 10/31/2028 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.18%
Interest rate swap, 6/20/2030
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	1
Hedge interest rates	2.57%
Notional amount	$ 67,013
Derivative asset, fair market value	$ 963
Interest rate swap, 9/30/2031
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	1
Hedge interest rates	3.23%
Notional amount	$ 8,642
Derivative liability, fair market value	$ (101)
Interest rate swap, 4/20/2032
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	1
Hedge interest rates	2.60%
Notional amount	$ 33,409
Derivative asset, fair market value	$ 530
Interest rate swap, 7/31/2034
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	5
Notional amount	$ 144,379
Derivative asset, fair market value	$ 3,010
Interest rate swap, 7/31/2034 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.48%
Interest rate swap, 7/31/2034 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.95%
Interest rate swap, 7/31/2035
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	5
Notional amount	$ 151,869
Derivative asset, fair market value	$ 1,880
Interest rate swap, 7/31/2035 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.62%
Interest rate swap, 7/31/2035 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.95%
Interest rate swap, 10/31/2036
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	5
Notional amount	$ 182,267
Derivative asset, fair market value	$ 2,049
Interest rate swap, 10/31/2036 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.62%
Interest rate swap, 10/31/2036 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.95%
Interest rate swap, 1/31/2038
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	3
Notional amount	$ 101,135
Derivative liability, fair market value	$ (568)
Interest rate swap, 1/31/2038 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	3.01%
Interest rate swap, 1/31/2038 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	3.16%