Subordinated Debentures (Details)		12 Months Ended		37 Months Ended	63 Months Ended
	Oct. 27, 2016	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Apr. 30, 2007 USD ($) debt	Sep. 30, 2014	Apr. 30, 2004 USD ($)
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Trust preferred issuance, amount		$ 209,000	$ 268,000
Subordinated debentures		10,310,000	20,620,000
Gain on extinguishment of debt		1,000,000	1,750,000
Centrue Statutory Trust II and Centrue Statutory Trust III | Other assets
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Investments		300,000
Subordinated debentures | Centrue Statutory Trust II and Centrue Statutory Trust III
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Subordinated debentures				$ 20,600,000
Trust Preferred Stock
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Interest expense on trust preferred securities		500,000	$ 500,000
Permitted default period for interest payments					5 years
Centrue Statutory Trust II and Centrue Statutory Trust III
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Stated liquidation amount per preferred security		$ 1,000
Centrue Statutory Trust II and Centrue Statutory Trust III | Subordinated debentures
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Number of trust preferred issuances (in debt) | debt				2
Trust preferred issuance, amount				$ 10,000,000.0		$ 10,000,000
Centrue Statutory Trust II | Trust Preferred Stock
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
LIBOR rate		0.9932%
Effective interest rate		3.64%	3.18%
Centrue Statutory Trust II | Trust Preferred Stock | London Interbank Offered Rate (LIBOR)
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Distributions, cumulative and payable quarterly at a variable rate		2.65%
Centrue Statutory Trust III | Trust Preferred Stock
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
LIBOR rate	0.8456%
Effective interest rate	2.50%		1.98%
Centrue Statutory Trust III | Trust Preferred Stock | London Interbank Offered Rate (LIBOR)
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Distributions, cumulative and payable quarterly at a variable rate	1.65%