Accounting For Certain Loans Acquired In a Purchase - Carrying Amount of Loans Included in Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired	$ 690,218
Carrying Amount	636,182
Allowance	229	0
Carrying Amount	635,953
Merger with CFS Bancorp, Inc. (Citizens)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired	629,184
Carrying Amount	585,913
Carrying Amount	585,913
SCB Bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired	61,034	80,165
Carrying Amount	50,269	65,600
Allowance	229
Carrying Amount	50,040	65,600
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired	89,487
Commercial and industrial loans | Merger with CFS Bancorp, Inc. (Citizens)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired	81,303
Commercial and industrial loans | SCB Bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired	8,184	12,645
Agriculture Production financing and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired	1,161
Agriculture Production financing and other loans to farmers | SCB Bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired	1,161	1,179
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired	17,962
Construction | Merger with CFS Bancorp, Inc. (Citizens)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired	17,962
Construction | SCB Bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired		65
Commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired	335,049
Commercial and farmland | Merger with CFS Bancorp, Inc. (Citizens)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired	311,631
Commercial and farmland | SCB Bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired	23,418	30,303
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired	176,113
Residential | Merger with CFS Bancorp, Inc. (Citizens)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired	166,754
Residential | SCB Bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired	9,359	13,724
Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired	67,278
Home Equity | Merger with CFS Bancorp, Inc. (Citizens)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired	49,042
Home Equity | SCB Bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired	18,236	21,544
Individuals' loans for household and other personal expenditures
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired	2,629
Individuals' loans for household and other personal expenditures | Merger with CFS Bancorp, Inc. (Citizens)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired	2,360
Individuals' loans for household and other personal expenditures | SCB Bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired	269	705
Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired	539
Other loans | Merger with CFS Bancorp, Inc. (Citizens)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired	132
Other loans | SCB Bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Acquired	$ 407