Accounting for Certain Loans Acquired in a Purchase - Carrying Amount of Loans Included in Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 860,185	$ 961,382
Carrying Amount	821,158	917,589
Allowance	202	153
Carrying Amount Net of Allowance	820,956	917,436
Loans acquired and accounted for under ASC 310-30, outstanding balance	76,600	95,800
Loans acquired and accounted for under ASC 310-30, carrying amount	55,800	69,600
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	80,739	85,441
Agricultural production financing and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,874	3,049
Real estate loans - Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	47,178	40,991
Real estate loans - Commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	366,642	425,014
Real estate loans - Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	286,823	325,141
Real estate loans - Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	71,343	77,053
Individuals' loans for household and other personal expenditures
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,677	2,693
Other commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,909	2,000
Ameriana
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	302,961	330,918
Carrying Amount	290,946	319,664
Carrying Amount Net of Allowance	290,946	319,664
Ameriana | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	21,544	21,888
Ameriana | Real estate loans - Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	32,597	23,365
Ameriana | Real estate loans - Commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	120,330	144,514
Ameriana | Real estate loans - Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	112,520	123,231
Ameriana | Real estate loans - Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	13,029	14,261
Ameriana | Individuals' loans for household and other personal expenditures
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,101	1,731
Ameriana | Other commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,840	1,928
C Financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	87,586	99,166
Carrying Amount	85,505	96,829
Allowance	180
Carrying Amount Net of Allowance	85,325	96,829
C Financial | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	95	104
C Financial | Real estate loans - Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	5,034	6,214
C Financial | Real estate loans - Commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	25,024	27,838
C Financial | Real estate loans - Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	48,782	55,856
C Financial | Real estate loans - Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	8,646	9,144
C Financial | Individuals' loans for household and other personal expenditures
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	5	10
Community
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	82,740	99,541
Carrying Amount	77,933	93,355
Allowance	22	4
Carrying Amount Net of Allowance	77,911	93,351
Community | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	5,613	6,769
Community | Agricultural production financing and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,802	1,761
Community | Real estate loans - Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	8,923	10,436
Community | Real estate loans - Commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	45,281	49,997
Community | Real estate loans - Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	12,159	21,886
Community | Real estate loans - Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	7,724	8,231
Community | Individuals' loans for household and other personal expenditures
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	238	461
CFS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	352,193	393,014
Carrying Amount	336,031	373,649
Allowance		149
Carrying Amount Net of Allowance	336,031	373,500
CFS | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	49,079	52,060
CFS | Agricultural production financing and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	25
CFS | Real estate loans - Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	624	976
CFS | Real estate loans - Commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	164,742	189,372
CFS | Real estate loans - Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	107,895	118,105
CFS | Real estate loans - Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	29,464	31,986
CFS | Individuals' loans for household and other personal expenditures
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	295	443
CFS | Other commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	69	72
SCB
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	34,705	38,743
Carrying Amount	30,743	34,092
Carrying Amount Net of Allowance	30,743	34,092
SCB | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,408	4,620
SCB | Agricultural production financing and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,047	1,288
SCB | Real estate loans - Commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	11,265	13,293
SCB | Real estate loans - Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	5,467	6,063
SCB | Real estate loans - Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	12,480	13,431
SCB | Individuals' loans for household and other personal expenditures
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 38	$ 48