Loans (Schedule of Risk Category of Loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2016		Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	$ 1,971,502	[1],[2]	$ 1,574,027	[3],[4]
Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	464,728	[1]	419,176	[3]
Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	842,104	[1]	620,163	[3]
Agricultural Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	288,348	[1]	249,699	[3]
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	1,505,472		1,222,245
Pass | Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	442,420		393,270
Pass | Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	793,605		586,247
Pass | Agricultural Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	269,447		242,728
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	65,331		44,193
Special Mention | Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	13,293		13,675
Special Mention | Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	35,731		25,341
Special Mention | Agricultural Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	16,307		5,177
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	24,377		22,600
Substandard | Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	9,015		12,231
Substandard | Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	12,768		8,575
Substandard | Agricultural Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	2,594		1,794
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0		0
Doubtful | Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0		0
Doubtful | Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0		0
Doubtful | Agricultural Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0		0
Total
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	1,595,180		1,289,038
Total | Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	464,728		419,176
Total | Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	842,104		620,163
Total | Agricultural Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	288,348		249,699
Receivables Acquired with Deteriorated Credit Quality
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)	13,275		7,555
Receivables Acquired with Deteriorated Credit Quality | Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)	1,379		1,325
Receivables Acquired with Deteriorated Credit Quality | Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)	9,000		5,363
Receivables Acquired with Deteriorated Credit Quality | Agricultural Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)	699		0
Receivables Acquired with Deteriorated Credit Quality | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)	1,659		1,572
Receivables Acquired with Deteriorated Credit Quality | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)	3,251		3,319
Receivables Acquired with Deteriorated Credit Quality | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)	6,168		1,797
Receivables Acquired with Deteriorated Credit Quality | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)	0		0
Receivables Acquired with Deteriorated Credit Quality | Total
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)	11,078		$ 6,688
River Valley Bancorp
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	293,812
River Valley Bancorp | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)	196,478
River Valley Bancorp | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)	17,379
River Valley Bancorp | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)	5,747
River Valley Bancorp | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)	0
River Valley Bancorp | Total
Financing Receivable, Recorded Investment [Line Items]
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)	$ 219,604

[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.