Junior Subordinated Debentures Held by Trust Subsidiaries (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Debt Instrument [Line Items]
Amount of Trust Preferred Securities Issued by Trust	$ 62,250		$ 62,250
Principal Amount of Debenture Issued to Trust	64,178		64,178
Junior Subordinated Notes, Maturing 2033 | Junior Subordinated Debt | Commercebank Capital Trust VI
Debt Instrument [Line Items]
Principal Amount of Debenture Issued to Trust	$ 9,537		$ 9,537
Junior Subordinated Notes, Maturing 2033 | Junior Subordinated Debt | Commercebank Capital Trust VI | SOFR
Debt Instrument [Line Items]
Annual Rate of Trust Preferred Securities and Debentures	3.61%
Junior Subordinated Notes, Maturing 2033 | Junior Subordinated Debt | Commercebank Capital Trust VI | LIBOR
Debt Instrument [Line Items]
Annual Rate of Trust Preferred Securities and Debentures			3.35%
Junior Subordinated Notes, Maturing 2033 | Junior Subordinated Debt | Commercebank Capital Trust VII
Debt Instrument [Line Items]
Principal Amount of Debenture Issued to Trust	$ 8,248		$ 8,248
Junior Subordinated Notes, Maturing 2033 | Junior Subordinated Debt | Commercebank Capital Trust VII | SOFR
Debt Instrument [Line Items]
Annual Rate of Trust Preferred Securities and Debentures	3.51%
Junior Subordinated Notes, Maturing 2033 | Junior Subordinated Debt | Commercebank Capital Trust VII | LIBOR
Debt Instrument [Line Items]
Annual Rate of Trust Preferred Securities and Debentures		3.25%
Junior Subordinated Notes, Maturing 2033 | Commercebank Capital Trust VI
Debt Instrument [Line Items]
Amount of Trust Preferred Securities Issued by Trust	$ 9,250		9,250
Junior Subordinated Notes, Maturing 2033 | Commercebank Capital Trust VII
Debt Instrument [Line Items]
Amount of Trust Preferred Securities Issued by Trust	8,000		8,000
Junior Subordinated Notes, Maturing 2034 | Junior Subordinated Debt | Commercebank Capital Trust VIII
Debt Instrument [Line Items]
Principal Amount of Debenture Issued to Trust	$ 5,155		5,155
Junior Subordinated Notes, Maturing 2034 | Junior Subordinated Debt | Commercebank Capital Trust VIII | SOFR
Debt Instrument [Line Items]
Annual Rate of Trust Preferred Securities and Debentures	3.11%
Junior Subordinated Notes, Maturing 2034 | Junior Subordinated Debt | Commercebank Capital Trust VIII | LIBOR
Debt Instrument [Line Items]
Annual Rate of Trust Preferred Securities and Debentures		2.85%
Junior Subordinated Notes, Maturing 2034 | Commercebank Capital Trust VIII
Debt Instrument [Line Items]
Amount of Trust Preferred Securities Issued by Trust	$ 5,000		5,000
Junior Subordinated Notes, Maturing 2038 | Junior Subordinated Debt | Commercebank Capital Trust IX
Debt Instrument [Line Items]
Principal Amount of Debenture Issued to Trust	$ 25,774		25,774
Junior Subordinated Notes, Maturing 2038 | Junior Subordinated Debt | Commercebank Capital Trust IX | SOFR
Debt Instrument [Line Items]
Annual Rate of Trust Preferred Securities and Debentures	2.01%
Junior Subordinated Notes, Maturing 2038 | Junior Subordinated Debt | Commercebank Capital Trust IX | LIBOR
Debt Instrument [Line Items]
Annual Rate of Trust Preferred Securities and Debentures		1.75%
Junior Subordinated Notes, Maturing 2038 | Commercebank Capital Trust IX
Debt Instrument [Line Items]
Amount of Trust Preferred Securities Issued by Trust	$ 25,000		25,000
Junior Subordinated Notes, Maturing 2036 | Junior Subordinated Debt | Commercebank Capital Trust X
Debt Instrument [Line Items]
Principal Amount of Debenture Issued to Trust	$ 15,464		15,464
Junior Subordinated Notes, Maturing 2036 | Junior Subordinated Debt | Commercebank Capital Trust X | SOFR
Debt Instrument [Line Items]
Annual Rate of Trust Preferred Securities and Debentures	2.04%
Junior Subordinated Notes, Maturing 2036 | Junior Subordinated Debt | Commercebank Capital Trust X | LIBOR
Debt Instrument [Line Items]
Annual Rate of Trust Preferred Securities and Debentures		1.78%
Junior Subordinated Notes, Maturing 2036 | Commercebank Capital Trust X
Debt Instrument [Line Items]
Amount of Trust Preferred Securities Issued by Trust	$ 15,000		$ 15,000