Accounting for Certain Loans Acquired in a Purchase - Accretable Yield or Income Expected to be Collected (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Beginning balance	$ 5,612	$ 5,390
Accretion	(1,496)	(1,705)
Reclassification from nonaccretable	1,183	1,132
Ending balance	5,299	4,817
Ameriana
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Beginning balance	2,160
Accretion	(40)
Ending balance	2,120
C Financial
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Beginning balance	114
Accretion	(15)
Reclassification from nonaccretable	1
Ending balance	100
Community
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Beginning balance	1,508	2,122
Accretion	(63)	(179)
Reclassification from nonaccretable	11	47
Ending balance	1,456	1,990
CFS
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Beginning balance	1,188	2,400
Accretion	(1,290)	(1,341)
Reclassification from nonaccretable	1,135	950
Ending balance	1,033	2,009
SCB
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Beginning balance	642	868
Accretion	(88)	(185)
Reclassification from nonaccretable	36	135
Ending balance	$ 590	$ 818