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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 |  |

X
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