Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Commitments And Contingencies [Line Items]
Additional successive terms extendable at the option	4 years
Period of extendable lease term, in years	5 years
Lease term, description	Less than one year
Sale leaseback transaction, gain recognized over lease term	$ 71.4	$ 79.9
Loan commitments	1,382		1,271
Fixed rate loan commitment	1,303
Floating rate loan commitment	79
Standby letters of credit	68.7		62.0
Loan commitments fixed interest rate, minimum	0.00%
Loan commitments fixed interest rate, maximum	21.00%
Allowance for unfunded loan commitments	3.5		2.7
Extended credit	13.5		15.6
Credit extensions with collateral	$ 10.4		$ 12.4
Minimum [Member]
Commitments And Contingencies [Line Items]
Lease Term	1 year
Minimum [Member] | Indiana Community Bancorp [Member]
Commitments And Contingencies [Line Items]
Lease Term	5 years
Maximum [Member]
Commitments And Contingencies [Line Items]
Lease Term	24 years
Maximum [Member] | Indiana Community Bancorp [Member]
Commitments And Contingencies [Line Items]
Lease Term	24 years