Segment Reporting (Financial Statements Information) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Net interest income	$ 9,576	$ 8,053
Net gains on sales of loans, SBA	964	1,539
Mortgage banking income	3,289	115
Noncash items:
Provision for loan losses	315	462
Depreciation and amortization	484	300
Income tax expense (benefit)	522	622
Segment profit (loss)	3,104	3,493
Segment assets	1,073,989	930,152
Core Banking Segment [Member]
Net interest income	8,820	7,519
Net gains on sales of loans, SBA	0	0
Mortgage banking income	27	115
Noncash items:
Provision for loan losses	(16)	(394)
Depreciation and amortization	452	287
Income tax expense (benefit)	670	687
Segment profit (loss)	2,934	3,155
Segment assets	1,048,386	924,594
SBA Lending Segment [Member]
Net interest income	908	527
Net gains on sales of loans, SBA	964	1,539
Mortgage banking income	0	0
Noncash items:
Provision for loan losses	331	856
Depreciation and amortization	12	13
Income tax expense (benefit)	0	0
Segment profit (loss)	353	218
Segment assets	70,127	63,030
Mortgage Banking Segment [Member]
Net interest income	154	0
Net gains on sales of loans, SBA		0
Mortgage banking income	3,262	0
Noncash items:
Provision for loan losses	0	0
Depreciation and amortization	20	0
Income tax expense (benefit)	(13)	0
Segment profit (loss)	(37)	0
Segment assets	17,059
Other Segment [Member]
Net interest income	(306)	7
Net gains on sales of loans, SBA	0	0
Mortgage banking income	0	0
Noncash items:
Provision for loan losses	0	0
Depreciation and amortization	0	0
Income tax expense (benefit)	(135)	(65)
Segment profit (loss)	(146)	120
Segment assets	$ (61,583)	$ (57,472)