Accounting for Certain Loans Acquired in a Purchase - Carrying Amount of Loans Included in Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	$ 961,382	$ 698,457
Carrying Amount	917,589	658,471
Allowance	153	650
Carrying Amount	917,436	657,821
Ameriana
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	330,918
Carrying Amount	319,664
Carrying Amount	319,664
C Financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	99,166
Carrying Amount	96,829
Carrying Amount	96,829
Community
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	99,541	142,989
Carrying Amount	93,355	134,198
Allowance	4
Carrying Amount	93,351	134,198
CFS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	393,014	509,660
Carrying Amount	373,649	484,949
Allowance	149	650
Carrying Amount	373,500	484,299
SCB
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	38,743	45,808
Carrying Amount	$ 34,092	39,324
Allowance
Carrying Amount	$ 34,092	39,324
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	85,441	79,124
Commercial and industrial loans | Ameriana
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	21,888
Commercial and industrial loans | C Financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	104
Commercial and industrial loans | Community
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	6,769	8,168
Commercial and industrial loans | CFS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	52,060	64,897
Commercial and industrial loans | SCB
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	4,620	6,059
Agriculture production financing and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	3,049	1,993
Agriculture production financing and other loans to farmers | Community
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	$ 1,761	1,100
Agriculture production financing and other loans to farmers | CFS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance
Agriculture production financing and other loans to farmers | SCB
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	$ 1,288	893
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	40,991	28,176
Construction | Ameriana
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	23,365
Construction | C Financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	6,214
Construction | Community
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	10,436	19,063
Construction | CFS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	$ 976	9,113
Construction | SCB
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance
Commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	$ 425,014	341,195
Commercial and farmland | Ameriana
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	144,514
Commercial and farmland | C Financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	27,838
Commercial and farmland | Community
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	49,997	74,600
Commercial and farmland | CFS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	189,372	251,002
Commercial and farmland | SCB
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	13,293	15,593
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	325,141	180,643
Residential | Ameriana
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	123,231
Residential | C Financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	55,856
Residential | Community
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	21,886	28,863
Residential | CFS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	118,105	144,396
Residential | SCB
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	6,063	7,384
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	77,053	64,883
Home equity | Ameriana
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	14,261
Home equity | C Financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	9,144
Home equity | Community
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	8,231	9,881
Home equity | CFS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	31,986	39,244
Home equity | SCB
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	13,431	15,758
Individuals' loans for household and other personal expenditures
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	2,693	2,357
Individuals' loans for household and other personal expenditures | Ameriana
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	1,731
Individuals' loans for household and other personal expenditures | C Financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	10
Individuals' loans for household and other personal expenditures | Community
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	461	1,314
Individuals' loans for household and other personal expenditures | CFS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	443	922
Individuals' loans for household and other personal expenditures | SCB
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	48	121
Other commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	2,000	86
Other commercial loans | Ameriana
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	$ 1,928
Other commercial loans | Community
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance
Other commercial loans | CFS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance	$ 72	$ 86
Other commercial loans | SCB
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Balance