Accounting for Certain Loans Acquired in a Purchase - Contractually Required Payments (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required payments receivable at acquisition date	$ 31,725
Nonaccretable difference	14,365
Expected cash flows at acquisition date	17,360
Accretable difference	2,993
Basis in loans at acquisition date	14,367
Ameriana
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required payments receivable at acquisition date	29,093
Nonaccretable difference	13,728
Expected cash flows at acquisition date	15,365
Accretable difference	2,848
Basis in loans at acquisition date	12,517
C Financial
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required payments receivable at acquisition date	2,632
Nonaccretable difference	637
Expected cash flows at acquisition date	1,995
Accretable difference	145
Basis in loans at acquisition date	$ 1,850
Community
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required payments receivable at acquisition date		$ 26,032
Nonaccretable difference		3,498
Expected cash flows at acquisition date		22,534
Accretable difference		2,234
Basis in loans at acquisition date		$ 20,300