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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Oct. 01, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period |  | $ 124,657 | [1] | $ 111,000 |
Balance at end of period |  | 156,905 |  | 114,112 |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period | [2] | (129) |  | (124) |
Other comprehensive loss | [2] | (79) |  | (12) |
Balance at end of period | [2] | (145) |  | (136) |
Accumulated Net Unrealized Investment Gain (Loss) | Available-for-sale Securities |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period | [2] | (58) |  | (19) |
Other comprehensive loss | [2] | (86) |  | (7) |
Balance at end of period | [2] | (81) |  | (26) |
Accumulated Net Unrealized Investment Gain (Loss) | Held-to-maturity Securities |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period | [2] | (71) |  | (105) |
Other comprehensive loss | [2] | 7 |  | (5) |
Balance at end of period | [2] | $ (64) |  | $ (110) |
Accounting Standards Update 2016-01 |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Adoption of ASU 2016-01 |  |  |  |  | $ 0
Accounting Standards Update 2016-01 | Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Adoption of ASU 2016-01 |  |  |  |  | 63
Accounting Standards Update 2016-01 | Accumulated Net Unrealized Investment Gain (Loss) | Available-for-sale Securities |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Adoption of ASU 2016-01 |  |  |  |  | 63
Accounting Standards Update 2016-01 | Accumulated Net Unrealized Investment Gain (Loss) | Held-to-maturity Securities |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Adoption of ASU 2016-01 |  |  |  |  | $ 0
[1] | Derived from audited consolidated financial statements.
[2] | All amounts are net of income taxes.

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