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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Consumer Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | $ 165 | $ 524 | $ 165 | $ 524
Unpaid Principal Balance | 165 | 596 | 165 | 596
Related Allowance | 49 | 114 | 49 | 114
Average Recorded Investment | 138 | 497 | 160 | 334
Interest Income Recognized | 1 | 7 | 25 | 11
Agricultural Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 0 | 88 | 0 | 88
Unpaid Principal Balance | 0 | 88 | 0 | 88
Related Allowance | 0 | 9 | 0 | 9
Average Recorded Investment | 94 | 88 | 125 | 66
Interest Income Recognized | 7 | 0 | 8 | 0
Agricultural [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 0 | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0 | 0
Related Allowance | 0 | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 0 | 0
Interest Income Recognized | 0 | 0 | 0 | 0
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 709 | 571 | 709 | 571
Unpaid Principal Balance | 709 | 818 | 709 | 818
Related Allowance | 0 | 219 | 0 | 219
Average Recorded Investment | 739 | 878 | 861 | 929
Interest Income Recognized | 0 | 0 | 9 | 0
Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 812 | 378 | 812 | 378
Unpaid Principal Balance | 812 | 378 | 812 | 378
Related Allowance | 203 | 81 | 203 | 81
Average Recorded Investment | 817 | 416 | 843 | 2,138
Interest Income Recognized | 7 | 0 | 7 | 1
Consumer [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 0 | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0 | 0
Related Allowance | 0 | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 0 | 0
Interest Income Recognized | 0 | 0 | 0 | 0
With no related allowance recorded [Member] | Consumer Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 26 | 152 | 26 | 152
Unpaid Principal Balance | 26 | 224 | 26 | 224
Related Allowance | 0 | 0 | 0 | 0
Average Recorded Investment | 26 | 224 | 38 | 162
Interest Income Recognized | 0 | 6 | 1 | 7
With no related allowance recorded [Member] | Agricultural Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 0 | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0 | 0
Related Allowance | 0 | 0 | 0 | 0
Average Recorded Investment | 94 | 0 | 125 | 0
Interest Income Recognized | 7 | 0 | 8 | 0
With no related allowance recorded [Member] | Agricultural [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 0 | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0 | 0
Related Allowance | 0 | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 0 | 0
Interest Income Recognized | 0 | 0 | 0 | 0
With no related allowance recorded [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 709 | 101 | 709 | 101
Unpaid Principal Balance | 709 | 101 | 709 | 101
Related Allowance | 0 | 0 | 0 | 0
Average Recorded Investment | 739 | 364 | 829 | 536
Interest Income Recognized | 0 | 0 | 9 | 0
With no related allowance recorded [Member] | Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 474 | 0 | 474 | 0
Unpaid Principal Balance | 474 | 0 | 474 | 0
Related Allowance | 0 | 0 | 0 | 0
Average Recorded Investment | 476 | 0 | 279 | 198
Interest Income Recognized | 7 | 0 | 7 | 0
With no related allowance recorded [Member] | Consumer [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 0 | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0 | 0
Related Allowance | 0 | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 0 | 0
Interest Income Recognized | 0 | 0 | 0 | 0
With a specific allowance recorded [Member] | Consumer Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 139 | 372 | 139 | 372
Unpaid Principal Balance | 139 | 372 | 139 | 372
Related Allowance | 49 | 114 | 49 | 114
Average Recorded Investment | 112 | 273 | 0 | 172
Interest Income Recognized | 1 | 1 | 24 | 4
With a specific allowance recorded [Member] | Agricultural Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 0 | 88 | 0 | 88
Unpaid Principal Balance | 0 | 88 | 0 | 88
Related Allowance | 0 | 9 | 0 | 9
Average Recorded Investment | 0 | 88 | 0 | 66
Interest Income Recognized | 0 | 0 | 0 | 0
With a specific allowance recorded [Member] | Agricultural [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 0 | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0 | 0
Related Allowance | 0 | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 0 | 0
Interest Income Recognized | 0 | 0 | 0 | 0
With a specific allowance recorded [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 0 | 470 | 0 | 470
Unpaid Principal Balance | 0 | 717 | 0 | 717
Related Allowance | 0 | 219 | 0 | 219
Average Recorded Investment | 0 | 514 | 32 | 393
Interest Income Recognized | 0 | 0 | 0 | 0
With a specific allowance recorded [Member] | Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 338 | 378 | 338 | 378
Unpaid Principal Balance | 338 | 378 | 338 | 378
Related Allowance | 203 | 81 | 203 | 81
Average Recorded Investment | 341 | 416 | 564 | 1,940
Interest Income Recognized | 0 | 0 | 0 | 1
With a specific allowance recorded [Member] | Consumer [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 0 | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0 | 0
Related Allowance | 0 | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 0 | 0
Interest Income Recognized | $ 0 | $ 0 | $ 0 | $ 0

X
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