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Leases - Cost and Accumulated Depreciation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Dec. 31, 2018
Future minimum rental payments under noncancelable leases |  |  |
Remainder of 2019 | $ 1,635 | $ 1,635 |
2020 |  |  | $ 8,668
2021 |  |  | 7,961
2022 |  |  | 5,101
2023 |  |  | 2,632
Thereafter |  |  | 34,638
Office space leased in headquarters office and to third party lessees |  |  |
Future minimum rental income from related parties |  | $0.1 million and $0.3 million, respectively |
Third party lessees |  |  |
Office space leased in headquarters office and to third party lessees |  |  |
Cost | 288,800 | $ 288,800 | 289,200
Buildings |  |  |
Office space leased in headquarters office and to third party lessees |  |  |
Accumulated Depreciation | 139,300 | 139,300 | $ 133,700
Related parties associated with its branch premises |  |  |
Lease payments to related parties | 100 | 300 |
Future minimum rental payments under noncancelable leases |  |  |
2020 | 300 | 300 |
2021 | 300 | 300 |
2022 | 200 | 200 |
2023 | 200 | 200 |
Thereafter | $ 7,500 | $ 7,500 |

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- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease having an initial or remaining lease term in excess of one year due in remainder of fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details
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