Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended
		Dec. 31, 2022		Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period		$ 218,569	[1]	$ 206,899
Balance at end of period		223,549		210,375
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	[2]	(717)		59
Other comprehensive income (loss)	[2]	(18)		(17)
Balance at end of period	[2]	(735)		42
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]	(706)		75
Other comprehensive income (loss)	[2]	(19)		(18)
Balance at end of period	[2]	(725)		57
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]	(11)		(16)
Other comprehensive income (loss)	[2]	1		1
Balance at end of period	[2]	$ (10)		$ (15)

[1] Derived from audited consolidated financial statements.

[2] All amounts are net of income taxes.