River Financial Corporation (Parent Company Only) Financial Information - Statements of Financial Condition (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets
Deferred income taxes	$ 29,901	$ 30,540
Other assets	15,995	11,235
Total assets	3,235,250	2,833,382
Liabilities
Subordinated debentures, net of loan costs	39,492	39,419
Total liabilities	3,032,429	2,695,196
Common stock related to 401(k) Employee Stock Option Plan	4,483	4,160
Stockholders' Equity
Common stock	7,670	6,666
Additional paid in capital	137,017	104,294
Retained earnings	124,333	100,826
Accumulated other comprehensive loss	(64,003)	(71,564)
Unvested restricted stock	(1,700)	(1,730)
Treasury stock, at cost	(496)	(306)
Common stock related to 401(k) Employee Stock Option Plan	(4,483)	(4,160)
Total stockholders' equity	198,338	134,026	$ 179,562
Total equity	202,821	138,186
Total liabilities and stockholders' equity	3,235,250	2,833,382
River Financial Corporation
Assets
Cash	4,206	2,425
Investment in River Bank & Trust	239,185	175,694
Deferred income taxes	16	18
Other assets		23
Total assets	243,407	178,160
Liabilities
Subordinated debentures, net of loan costs	39,492	39,419
Accrued expenses	568	555
Other liabilities	526
Total liabilities	40,586	39,974
Common stock related to 401(k) Employee Stock Option Plan	4,483	4,160
Stockholders' Equity
Common stock	7,670	6,666
Additional paid in capital	137,017	104,294
Retained earnings	124,333	100,826
Accumulated other comprehensive loss	(64,003)	(71,564)
Unvested restricted stock	(1,700)	(1,730)
Treasury stock, at cost	(496)	(306)
Common stock related to 401(k) Employee Stock Option Plan	(4,483)	(4,160)
Total stockholders' equity	198,338	134,026
Total equity	202,821	138,186
Total liabilities and stockholders' equity	$ 243,407	$ 178,160