Loans (Schedule of Aging of Recorded Investment in Loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2016		Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 1,971,502	[1],[2]	$ 1,574,027	[3],[4]
Loans Past Due	14,500	[2]	4,831	[4]
Loans Not Past Due	1,957,002	[2]	1,569,196	[4]
Accrued interest	7,220		5,952
Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	464,728	[1]	419,176	[3]
Loans Past Due	924		323
Loans Not Past Due	463,804		418,853
Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	842,104	[1]	620,163	[3]
Loans Past Due	3,736		403
Loans Not Past Due	838,368		619,760
Agricultural Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	288,348	[1]	249,699	[3]
Loans Past Due	1,851		0
Loans Not Past Due	286,497		249,699
Home Equity Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	124,711	[1]	98,167	[3]
Loans Past Due	392		437
Loans Not Past Due	124,319		97,730
Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	58,506	[1]	50,169	[3]
Loans Past Due	534		231
Loans Not Past Due	57,972		49,938
Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	193,105	[1]	136,653	[3]
Loans Past Due	7,063		3,437
Loans Not Past Due	186,042		133,216
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	7,454	[2]	3,159	[4]
30-59 Days Past Due | Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	235		82
30-59 Days Past Due | Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	2,097		136
30-59 Days Past Due | Agricultural Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	192		0
30-59 Days Past Due | Home Equity Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	223		225
30-59 Days Past Due | Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	347		101
30-59 Days Past Due | Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	4,360		2,615
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	3,136	[2]	482	[4]
60-89 Days Past Due | Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	634		117
60-89 Days Past Due | Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	595		163
60-89 Days Past Due | Agricultural Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	136		0
60-89 Days Past Due | Home Equity Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	29		8
60-89 Days Past Due | Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	4		40
60-89 Days Past Due | Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	1,738		154
90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	3,910	[2]	1,190	[4]
90 Days or More Past Due | Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	55		124
90 Days or More Past Due | Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	1,044		104
90 Days or More Past Due | Agricultural Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	1,523		0
90 Days or More Past Due | Home Equity Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	140		204
90 Days or More Past Due | Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	183		90
90 Days or More Past Due | Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	965		668
Receivables Acquired with Deteriorated Credit Quality | Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	13,275		7,555
Loans Past Due	2,131		0
Loans Not Past Due	11,144		7,555
Receivables Acquired with Deteriorated Credit Quality | 30-59 Days Past Due | Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	264		0
Receivables Acquired with Deteriorated Credit Quality | 60-89 Days Past Due | Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	529		0
Receivables Acquired with Deteriorated Credit Quality | 90 Days or More Past Due | Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	1,338		$ 0
River Valley Bancorp
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	293,812
Loans Past Due	9,062
Loans Not Past Due	284,750
River Valley Bancorp | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	3,824
River Valley Bancorp | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	2,046
River Valley Bancorp | 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due	$ 3,192

[1] Total recorded investment in loans includes $7,220 in accrued interest.

[2] Total recorded investment in loans includes $7,220 in accrued interest.

[3] Total recorded investment in loans includes $5,952 in accrued interest.

[4] Total recorded investment in loans includes $5,952 in accrued interest.