Accounting for Certain Loans Acquired in a Purchase - Contractually Required Payments (Details) $ in Thousands	Dec. 31, 2015 USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required payments receivable at acquisition date	$ 25,804
Nonaccretable difference	12,229
Expected cash flows at acquisition date	13,575
Accretable difference	2,305
Basis in loans at acquisition date	11,270
Ameriana
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required payments receivable at acquisition date	23,172
Nonaccretable difference	11,592
Expected cash flows at acquisition date	11,580
Accretable difference	2,160
Basis in loans at acquisition date	9,420
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