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Loans - Loans Individually Evaluated for Impairment by Portfolio Segment of Loans (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Other real estate owned - residential mortgages [Member]
Impaired Loans By Type [Line Items]
Recorded Investment	$ 300	$ 647
Unpaid Principal Balance	300	748
Related Allowance	78	70
Average Recorded Investment	342	723
Interest Income Recognized	15	13
Agricultural Real Estate [Member]
Impaired Loans By Type [Line Items]
Recorded Investment	88
Unpaid Principal Balance	88
Related Allowance	9
Average Recorded Investment	72
Interest Income Recognized
Agricultural [Member]
Impaired Loans By Type [Line Items]
Recorded Investment
Unpaid Principal Balance
Related Allowance
Average Recorded Investment
Interest Income Recognized
Commercial Real Estate [Member]
Impaired Loans By Type [Line Items]
Recorded Investment	1,675	877
Unpaid Principal Balance	2,022	1,300
Related Allowance	295	25
Average Recorded Investment	1,148	863
Interest Income Recognized	43
Commercial [Member]
Impaired Loans By Type [Line Items]
Recorded Investment	377	3,067
Unpaid Principal Balance	377	3,114
Related Allowance	134	770
Average Recorded Investment	1,752	1,848
Interest Income Recognized	2	13
Consumer [Member]
Impaired Loans By Type [Line Items]
Recorded Investment
Unpaid Principal Balance
Related Allowance
Average Recorded Investment		2
Interest Income Recognized
With no related allowance recorded [Member] | Other real estate owned - residential mortgages [Member]
Impaired Loans By Type [Line Items]
Recorded Investment	18	236
Unpaid Principal Balance	18	236
Related Allowance
Average Recorded Investment	138	269
Interest Income Recognized	10	12
With no related allowance recorded [Member] | Agricultural Real Estate [Member]
Impaired Loans By Type [Line Items]
Recorded Investment
Unpaid Principal Balance
Related Allowance
Average Recorded Investment
Interest Income Recognized
With no related allowance recorded [Member] | Agricultural [Member]
Impaired Loans By Type [Line Items]
Recorded Investment
Unpaid Principal Balance
Related Allowance
Average Recorded Investment
Interest Income Recognized
With no related allowance recorded [Member] | Commercial Real Estate [Member]
Impaired Loans By Type [Line Items]
Recorded Investment	906	207
Unpaid Principal Balance	906	384
Related Allowance
Average Recorded Investment	630	206
Interest Income Recognized	21
With no related allowance recorded [Member] | Commercial [Member]
Impaired Loans By Type [Line Items]
Recorded Investment		287
Unpaid Principal Balance		334
Related Allowance
Average Recorded Investment	203	212
Interest Income Recognized
With no related allowance recorded [Member] | Consumer [Member]
Impaired Loans By Type [Line Items]
Recorded Investment
Unpaid Principal Balance
Related Allowance
Average Recorded Investment
Interest Income Recognized
With a specific allowance recorded [Member] | Other real estate owned - residential mortgages [Member]
Impaired Loans By Type [Line Items]
Recorded Investment	282	411
Unpaid Principal Balance	282	512
Related Allowance	78	70
Average Recorded Investment	204	454
Interest Income Recognized	5	1
With a specific allowance recorded [Member] | Agricultural Real Estate [Member]
Impaired Loans By Type [Line Items]
Recorded Investment	88
Unpaid Principal Balance	88
Related Allowance	9
Average Recorded Investment	72
Interest Income Recognized
With a specific allowance recorded [Member] | Agricultural [Member]
Impaired Loans By Type [Line Items]
Recorded Investment
Unpaid Principal Balance
Related Allowance
Average Recorded Investment
Interest Income Recognized
With a specific allowance recorded [Member] | Commercial Real Estate [Member]
Impaired Loans By Type [Line Items]
Recorded Investment	769	670
Unpaid Principal Balance	1,116	916
Related Allowance	295	25
Average Recorded Investment	518	657
Interest Income Recognized	22
With a specific allowance recorded [Member] | Commercial [Member]
Impaired Loans By Type [Line Items]
Recorded Investment	377	2,780
Unpaid Principal Balance	377	2,780
Related Allowance	134	770
Average Recorded Investment	1,549	1,636
Interest Income Recognized	2	13
With a specific allowance recorded [Member] | Consumer [Member]
Impaired Loans By Type [Line Items]
Recorded Investment
Unpaid Principal Balance
Related Allowance
Average Recorded Investment		2
Interest Income Recognized

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- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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Impaired Financing Receivable Related Allowance During Period

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- Definition

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