River Financial Corporation (Parent Company Only) Financial Information - Statements of Financial Condition (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets
Deferred income taxes	$ 6,253	$ 1,625
Other assets	14,434	9,343
Total assets	2,395,680	1,864,650
Liabilities
Note payable		20,392
Subordinated debentures, net of loan costs	39,344
Total liabilities	2,213,002	1,696,470
Common stock related to 401(k) Employee Stock Option Plan	3,116	1,732
Stockholders' Equity
Common stock	6,570	6,529
Additional paid in capital	101,583	100,707
Retained earnings	75,815	53,391
Accumulated other comprehensive (loss) income	(1,222)	8,310
Treasury stock, at cost	(68)	(757)
Common stock related to 401(k) Employee Stock Option Plan	(3,116)	(1,732)
Total stockholders' equity	179,562	166,448	$ 145,192
Total equity	182,678	168,180
Total liabilities and stockholders' equity	2,395,680	1,864,650
River Financial Corporation
Assets
Cash	7,994	2,919
Investment in River Bank & Trust	214,532	185,797
Deferred income taxes	45	28
Other assets		103
Total assets	222,571	188,847
Liabilities
Note payable		20,392
Subordinated debentures, net of loan costs	39,344
Accrued expenses	549	275
Total liabilities	39,893	20,667
Common stock related to 401(k) Employee Stock Option Plan	3,116	1,732
Stockholders' Equity
Common stock	6,570	6,529
Additional paid in capital	101,583	100,707
Retained earnings	75,815	53,391
Accumulated other comprehensive (loss) income	(1,222)	8,310
Treasury stock, at cost	(68)	(757)
Common stock related to 401(k) Employee Stock Option Plan	(3,116)	(1,732)
Total stockholders' equity	179,562	166,448
Total equity	182,678	168,180
Total liabilities and stockholders' equity	$ 222,571	$ 188,847