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Loans - Loans Individually Evaluated for Impairment by Portfolio Segment of Loans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Consumer Real Estate [Member]
Impaired Loans By Type [Line Items]
Recorded Investment	$ 181	$ 310
Unpaid Principal Balance	181	382
Related Allowance	44	79
Average Recorded Investment	668	191
Interest Income Recognized	1	4
Agricultural Real Estate [Member]
Impaired Loans By Type [Line Items]
Recorded Investment	141
Unpaid Principal Balance	141
Related Allowance
Average Recorded Investment	505
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	1,385	845
Unpaid Principal Balance	1,385	1,289
Related Allowance	107	29
Average Recorded Investment	2,396	857
Interest Income Recognized	14
Commercial and Industrial [Member]
Impaired Loans By Type [Line Items]
Recorded Investment	352	2,989
Unpaid Principal Balance	352	2,989
Related Allowance	110	751
Average Recorded Investment	1,993	3,029
Interest Income Recognized	16
Consumer [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] | Consumer Real Estate [Member]
Impaired Loans By Type [Line Items]
Recorded Investment	72	33
Unpaid Principal Balance	72	33
Related Allowance
Average Recorded Investment	145	60
Interest Income Recognized		1
With no related allowance recorded [Member] | Agricultural Real Estate [Member]
Impaired Loans By Type [Line Items]
Recorded Investment	141
Unpaid Principal Balance	141
Related Allowance
Average Recorded Investment	328
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	904	801
Unpaid Principal Balance	904	1,225
Related Allowance
Average Recorded Investment	2,112	207
Interest Income Recognized	14
With no related allowance recorded [Member] | Commercial and Industrial [Member]
Impaired Loans By Type [Line Items]
Recorded Investment		285
Unpaid Principal Balance		285
Related Allowance
Average Recorded Investment	25	286
Interest Income Recognized	9
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] | Consumer Real Estate [Member]
Impaired Loans By Type [Line Items]
Recorded Investment	109	277
Unpaid Principal Balance	109	349
Related Allowance	44	79
Average Recorded Investment	523	131
Interest Income Recognized	1	3
With a specific allowance recorded [Member] | Agricultural Real Estate [Member]
Impaired Loans By Type [Line Items]
Recorded Investment
Unpaid Principal Balance
Related Allowance
Average Recorded Investment	177
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	481	44
Unpaid Principal Balance	481	64
Related Allowance	107	29
Average Recorded Investment	284	650
Interest Income Recognized
With a specific allowance recorded [Member] | Commercial and Industrial [Member]
Impaired Loans By Type [Line Items]
Recorded Investment	352	2,704
Unpaid Principal Balance	352	2,704
Related Allowance	110	751
Average Recorded Investment	1,968	2,743
Interest Income Recognized	7
With a specific allowance recorded [Member] | Consumer [Member]
Impaired Loans By Type [Line Items]
Recorded Investment
Unpaid Principal Balance
Related Allowance
Average Recorded Investment
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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