Subordinated Debentures (Details)	12 Months Ended		37 Months Ended	61 Months Ended	63 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Apr. 30, 2007 USD ($) debt	Jul. 31, 2012	Sep. 30, 2014	Apr. 30, 2004 USD ($)
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Trust preferred issuance, amount	$ 268,000	$ 268,000
Subordinated debentures	20,620,000	$ 20,620,000
Centrue Statutory Trust II and Centrue Statutory Trust III | Other assets
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Investments	600,000
London Interbank Offered Rate (LIBOR) | Subordinated debt
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Distributions, cumulative and payable quarterly at a variable rate		2.95%
Centrue Statutory Trust III | Subordinated debt
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Fixed rate for subordinated debentures				5 years
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	$ 600,000
Permitted default period for interest payments					5 years
Accrued interest payable	100,000	$ 4,800,000
Centrue Statutory Trust II and Centrue Statutory Trust III
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Trust preferred issuance, amount			$ 10,000,000.0
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
Centrue Statutory Trust II | Trust Preferred Stock
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
LIBOR rate	0.52575%
Effective interest rate	3.18%	2.89%
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	0.3255%
Effective interest rate	1.98%	1.89%
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%