CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	CedarPoint Common stock	CedarPoint Capital surplus	CedarPoint	Centrue Preferred stock.	Centrue Common stock	Centrue Capital surplus	Centrue	Preferred stock.	Common stock	Capital surplus	Retained earnings	Accumulated other comprehensive income (loss)	Total
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of change in accounting principle | Adjustments for New Accounting Principle, Early Adoption [Member] | Accounting Standards Update 2016-09 [Member]										$ 87	$ (87)
Beginning Balance (Scenario, Previously Reported [Member]) at Dec. 31, 2015									$ 118	135,822	90,911	$ 6,029	$ 232,880
Beginning Balance at Dec. 31, 2015									118	135,909	90,824	6,029	232,880
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income											11,908		11,908
Compensation expense for stock option grants										212			212
Amortization of restricted stock awards										251			251
Common dividends declared											(4,272)		(4,272)
Initial public offering of 3,590,065 shares of common stock, net of issuance costs									36	71,662			71,698
Issuance of common stock under employee benefits plans										145			145
Other comprehensive income (loss)												3,446	3,446
Ending Balance at Jun. 30, 2016									154	208,179	98,460	9,475	316,268
Beginning Balance at Dec. 31, 2016									155	209,712	112,513	(610)	321,770
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income											12,029		12,029
Compensation expense for stock option grants										273			273
Amortization of restricted stock awards										393			393
Preferred dividends declared											(19)		(19)
Common dividends declared											(6,322)		(6,322)
Acquisition	$ 1	$ 3,350	$ 3,351	$ 3,134	$ 32	$ 112,480	$ 115,646
Issuance of common stock under employee benefits plans									3	3,139			3,142
Other comprehensive income (loss)												1,689	1,689
Ending Balance at Jun. 30, 2017								$ 3,134	$ 191	$ 329,347	$ 118,201	$ 1,079	$ 451,952