INCOME TAX - Deferred tax asset (liability) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Assets
Allowance for loan losses	$ 8,590	$ 8,474
State net operating loss carryforward	3,876	3,543
Credit carryforwards	6,439	8,401
OREO write-downs	583	514
Other	3,456	3,019
Total assets	22,944	23,951
Liabilities
Depreciation	(6,041)	(6,864)
Mortgage servicing rights	(2,717)	(2,209)
Unrealized gain on securities AFS	(1,658)	(6,798)
Intangibles	(434)	(2,981)
Deferred loan fees/costs	(2,058)	(1,901)
Other	(3,725)	(2,336)
Total liabilities	(16,633)	(23,089)
Less: Valuation allowance	(2,934)	(3,091)
Net deferred tax asset	3,377
Net deferred tax liability		(2,229)
Indiana state operating loss carryforwards	102,365
Valuation allowance for deferred tax assets, excluding Indiana state loss carryforward and all Indiana deferred tax activity since 2004	0
Retained earnings for which no deferred income tax liability has been recognized	16,112
Deferred income tax liability recognized on retained earnings related to previously acquired institutions	0
Unrecorded deferred income tax liability	5,639	4,589
Unrecognized Tax Benefits
Interest and penalties recorded in the income statement	0	0
Amount accrued for interest and penalties	0	$ 0
Alternative minimum tax credit carryforwards
Liabilities
Tax credit carryforwards	3,288
General business credit carryforwards
Liabilities
Tax credit carryforwards	$ 3,152