Allowance for Loan Losses - Company's Recorded Investment and Customers' Unpaid Principal Balances for Impaired Loans, with Associated Allowance Amount (Detail) (USD $) | 3 Months Ended | 6 Months Ended | |
In Thousands, unless otherwise specified | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | | ' | | ' | | ' | | ' | |
With no related allowance, Recorded Investment | $3,664 | | ' | | $3,664 | | ' | | $3,912 | |
With no related allowance, Customers' Unpaid Principal Balance | 3,697 | | ' | | 3,697 | | ' | | 3,925 | |
With no related allowance, Related Allowance | ' | | ' | | ' | | ' | | ' | |
With an allowance recorded, Recorded Investment | 2,825 | | ' | | 2,825 | | ' | | 2,744 | |
With an allowance recorded, Customers' Unpaid Principal Balance | 2,844 | | ' | | 2,844 | | ' | | 3,377 | |
With an allowance recorded, Related Allowance | 756 | | ' | | 756 | | ' | | 667 | |
Total Impaired Loans, Recorded Investment | 6,489 | | ' | | 6,489 | | ' | | 6,656 | |
Total Impaired Loans, Customers' Unpaid Principal Balance | 6,541 | | ' | | 6,541 | | ' | | 7,302 | |
Total Impaired Loans, Related Allowance | 756 | | ' | | 756 | | ' | | 667 | |
With no related allowance, Average Recorded Investment | 3,674 | | 2,530 | | 3,686 | | 2,435 | | ' | |
With no related allowance, Interest Income Recognized | 35 | | 32 | | 73 | | 57 | | ' | |
With an allowance recorded, Average Recorded Investment | 2,686 | | 3,775 | | 2,644 | | 3,655 | | ' | |
With an allowance recorded, Interest Income Recognized | 30 | | 30 | | 54 | | 60 | | ' | |
Total, Average Recorded Investment | 6,360 | | 6,305 | | 6,330 | | 6,090 | | ' | |
Total, Interest Income Recognized | 65 | | 62 | | 127 | | 117 | | ' | |
Construction, Land and Land Development | ' | | ' | | ' | | ' | | ' | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | | ' | | ' | | ' | | ' | |
With no related allowance, Recorded Investment | 451 | | ' | | 451 | | ' | | 453 | |
With no related allowance, Customers' Unpaid Principal Balance | 453 | | ' | | 453 | | ' | | 453 | |
With no related allowance, Related Allowance | ' | | ' | | ' | | ' | | ' | |
With an allowance recorded, Recorded Investment | 428 | | ' | | 428 | | ' | | 151 | |
With an allowance recorded, Customers' Unpaid Principal Balance | 447 | | ' | | 447 | | ' | | 156 | |
With an allowance recorded, Related Allowance | 211 | | ' | | 211 | | ' | | 51 | |
Total Impaired Loans, Recorded Investment | 879 | | ' | | 879 | | ' | | 604 | |
Total Impaired Loans, Customers' Unpaid Principal Balance | 900 | | ' | | 900 | | ' | | 609 | |
Total Impaired Loans, Related Allowance | 211 | | ' | | 211 | | ' | | 51 | |
With no related allowance, Average Recorded Investment | 451 | | 13 | | 452 | | 13 | | ' | |
With no related allowance, Interest Income Recognized | 1 | | ' | | 2 | | ' | | ' | |
With an allowance recorded, Average Recorded Investment | 288 | | 200 | | 242 | | 200 | | ' | |
With an allowance recorded, Interest Income Recognized | 1 | | ' | | 1 | | ' | | ' | |
Total, Average Recorded Investment | 739 | | 213 | | 694 | | 213 | | ' | |
Total, Interest Income Recognized | 2 | | ' | | 3 | | ' | | ' | |
Residential First Mortgages | ' | | ' | | ' | | ' | | ' | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | | ' | | ' | | ' | | ' | |
With no related allowance, Recorded Investment | 1,039 | | ' | | 1,039 | | ' | | 1,053 | |
With no related allowance, Customers' Unpaid Principal Balance | 1,049 | | ' | | 1,049 | | ' | | 1,057 | |
With no related allowance, Related Allowance | ' | | ' | | ' | | ' | | ' | |
With an allowance recorded, Recorded Investment | 2,185 | | ' | | 2,185 | | ' | | 2,198 | |
With an allowance recorded, Customers' Unpaid Principal Balance | 2,185 | | ' | | 2,185 | | ' | | 2,198 | |
With an allowance recorded, Related Allowance | 436 | | ' | | 436 | | ' | | 409 | |
Total Impaired Loans, Recorded Investment | 3,224 | | ' | | 3,224 | | ' | | 3,251 | |
Total Impaired Loans, Customers' Unpaid Principal Balance | 3,234 | | ' | | 3,234 | | ' | | 3,255 | |
Total Impaired Loans, Related Allowance | 436 | | ' | | 436 | | ' | | 409 | |
With no related allowance, Average Recorded Investment | 1,042 | | 1,668 | | 1,046 | | 1,570 | | ' | |
With no related allowance, Interest Income Recognized | 10 | | 24 | | 21 | | 42 | | ' | |
With an allowance recorded, Average Recorded Investment | 2,186 | | 1,845 | | 2,190 | | 1,778 | | ' | |
With an allowance recorded, Interest Income Recognized | 26 | | 24 | | 47 | | 50 | | ' | |
Total, Average Recorded Investment | 3,228 | | 3,513 | | 3,236 | | 3,348 | | ' | |
Total, Interest Income Recognized | 36 | | 48 | | 68 | | 92 | | ' | |
Residential Revolving and Junior Mortgages | ' | | ' | | ' | | ' | | ' | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | | ' | | ' | | ' | | ' | |
With no related allowance, Related Allowance | ' | [1] | ' | | ' | [1] | ' | | ' | [1] |
With an allowance recorded, Recorded Investment | 174 | [1] | ' | | 174 | [1] | ' | | 251 | [1] |
With an allowance recorded, Customers' Unpaid Principal Balance | 174 | [1] | ' | | 174 | [1] | ' | | 879 | [1] |
With an allowance recorded, Related Allowance | 77 | [1] | ' | | 77 | [1] | ' | | 173 | [1] |
Total Impaired Loans, Recorded Investment | 174 | [1] | ' | | 174 | [1] | ' | | 251 | [1] |
Total Impaired Loans, Customers' Unpaid Principal Balance | 174 | [1] | ' | | 174 | [1] | ' | | 879 | [1] |
Total Impaired Loans, Related Allowance | 77 | [1] | ' | | 77 | [1] | ' | | 173 | [1] |
With no related allowance, Average Recorded Investment | ' | | 97 | [1] | ' | | 98 | [1] | ' | |
With an allowance recorded, Average Recorded Investment | 174 | [1] | 1,124 | [1] | 174 | [1] | 1,068 | [1] | ' | |
With an allowance recorded, Interest Income Recognized | 2 | [1] | 2 | [1] | 4 | [1] | 4 | [1] | ' | |
Total, Average Recorded Investment | 174 | [1] | 1,221 | [1] | 174 | [1] | 1,166 | [1] | ' | |
Total, Interest Income Recognized | 2 | [1] | 2 | [1] | 4 | [1] | 4 | [1] | ' | |
Commercial Mortgages (Non-Owner Occupied) | ' | | ' | | ' | | ' | | ' | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | | ' | | ' | | ' | | ' | |
With no related allowance, Recorded Investment | 264 | | ' | | 264 | | ' | | 264 | |
With no related allowance, Customers' Unpaid Principal Balance | 264 | | ' | | 264 | | ' | | 264 | |
With no related allowance, Related Allowance | ' | | ' | | ' | | ' | | ' | |
Total Impaired Loans, Recorded Investment | 264 | | ' | | 264 | | ' | | 264 | |
Total Impaired Loans, Customers' Unpaid Principal Balance | 264 | | ' | | 264 | | ' | | 264 | |
With no related allowance, Average Recorded Investment | 264 | | ' | | 264 | | ' | | ' | |
With no related allowance, Interest Income Recognized | 4 | | ' | | 8 | | ' | | ' | |
Total, Average Recorded Investment | 264 | | ' | | 264 | | ' | | ' | |
Total, Interest Income Recognized | 4 | | ' | | 8 | | ' | | ' | |
Commercial Mortgages (Owner Occupied) | ' | | ' | | ' | | ' | | ' | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | | ' | | ' | | ' | | ' | |
With no related allowance, Recorded Investment | 1,910 | | ' | | 1,910 | | ' | | 1,831 | |
With no related allowance, Customers' Unpaid Principal Balance | 1,931 | | ' | | 1,931 | | ' | | 1,840 | |
With no related allowance, Related Allowance | ' | | ' | | ' | | ' | | ' | |
With an allowance recorded, Recorded Investment | ' | | ' | | ' | | ' | | 105 | |
With an allowance recorded, Customers' Unpaid Principal Balance | ' | | ' | | ' | | ' | | 105 | |
With an allowance recorded, Related Allowance | ' | | ' | | ' | | ' | | 1 | |
Total Impaired Loans, Recorded Investment | 1,910 | | ' | | 1,910 | | ' | | 1,936 | |
Total Impaired Loans, Customers' Unpaid Principal Balance | 1,931 | | ' | | 1,931 | | ' | | 1,945 | |
Total Impaired Loans, Related Allowance | ' | | ' | | ' | | ' | | 1 | |
With no related allowance, Average Recorded Investment | 1,917 | | 752 | | 1,924 | | 754 | | ' | |
With no related allowance, Interest Income Recognized | 20 | | 8 | | 42 | | 15 | | ' | |
With an allowance recorded, Average Recorded Investment | ' | | 533 | | ' | | 536 | | ' | |
With an allowance recorded, Interest Income Recognized | ' | | 3 | | ' | | 3 | | ' | |
Total, Average Recorded Investment | 1,917 | | 1,285 | | 1,924 | | 1,290 | | ' | |
Total, Interest Income Recognized | 20 | | 11 | | 42 | | 18 | | ' | |
Commercial and Industrial loans | ' | | ' | | ' | | ' | | ' | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | | ' | | ' | | ' | | ' | |
With no related allowance, Recorded Investment | ' | | ' | | ' | | ' | | 311 | |
With no related allowance, Customers' Unpaid Principal Balance | ' | | ' | | ' | | ' | | 311 | |
With no related allowance, Related Allowance | ' | | ' | | ' | | ' | | ' | |
Total Impaired Loans, Recorded Investment | ' | | ' | | ' | | ' | | 311 | |
Total Impaired Loans, Customers' Unpaid Principal Balance | ' | | ' | | ' | | ' | | 311 | |
Consumer Loans | ' | | ' | | ' | | ' | | ' | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | ' | | ' | | ' | | ' | | ' | |
With no related allowance, Related Allowance | ' | [2] | ' | | ' | [2] | ' | | ' | [2] |
With an allowance recorded, Recorded Investment | 38 | [2] | ' | | 38 | [2] | ' | | 39 | [2] |
With an allowance recorded, Customers' Unpaid Principal Balance | 38 | [2] | ' | | 38 | [2] | ' | | 39 | [2] |
With an allowance recorded, Related Allowance | 32 | [2] | ' | | 32 | [2] | ' | | 33 | [2] |
Total Impaired Loans, Recorded Investment | 38 | [2] | ' | | 38 | [2] | ' | | 39 | [2] |
Total Impaired Loans, Customers' Unpaid Principal Balance | 38 | [2] | ' | | 38 | [2] | ' | | 39 | [2] |
Total Impaired Loans, Related Allowance | 32 | [2] | ' | | 32 | [2] | ' | | 33 | [2] |
With an allowance recorded, Average Recorded Investment | 38 | [2] | 73 | [2] | 38 | [2] | 73 | [2] | ' | |
With an allowance recorded, Interest Income Recognized | 1 | [2] | 1 | [2] | 2 | [2] | 3 | [2] | ' | |
Total, Average Recorded Investment | 38 | [2] | 73 | [2] | 38 | [2] | 73 | [2] | ' | |
Total, Interest Income Recognized | $1 | [2] | $1 | [2] | $2 | [2] | $3 | [2] | ' | |
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[1] | Junior mortgages include equity lines. |
[2] | Includes credit cards. |