Intangible Assets (Schedule of Goodwill and Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Schedule of Goodwill and Intangible Assets [Line Items]
Core Deposit and Other Intangibles, Amortization	$ (1,964)	$ (2,316)	$ (234)
Capital City Bancshares, Inc. [Member]
Schedule of Goodwill and Intangible Assets [Line Items]
Goodwill Balance	9,324	7,989	0
Goodwill, Acquired During Period			7,989
Goodwill, Purchase Accounting Adjustments	0	1,335
Goodwill, Amortization	0	0	0
Goodwill Balance	9,324	9,324	7,989
Core Deposit and Other Intangibles Balance	7,503	9,819	0
Core Deposit and Other Intangibles, Acquired During Period			10,052
Core Deposit and Other Intangibles, Purchase Accounting Adjustments	0	0
Core Deposit and Other Intangibles, Amortization	(1,964)	(2,316)	(234)
Core Deposit and Other Intangibles Balance	$ 5,539	$ 7,503	$ 9,819