Loans and allowance for loan losses (Details 2) (USD $) | 3 Months Ended | 12 Months Ended |
In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013 |
Financing Receivable, Impaired [Line Items] | ' | ' |
Impaired Loans, With No Related Allowance, Recorded Investment | $18,203 | $20,904 |
Impaired Loans, With No Related Allowance, Unpaid Principal Balance | 22,056 | 26,481 |
Impaired Loans, With No Related Allowance, Average Recorded Investment | 22,078 | 27,846 |
Impaired Loans, With No Related Allowance, Interest Income Recognized | 193 | 1,025 |
Impaired Loans, With Related Allowance, Recorded Investment | 11,232 | 8,364 |
Impaired Loans, With Related Allowance, Unpaid Principal Balance | 13,435 | 9,185 |
Impaired Loans, With Related Allowance, Related Loan Loss Allowance | 2,854 | 2,063 |
Impaired Loans, With Related Allowance, Average Recorded Investment | 13,514 | 9,408 |
Impaired Loans, With Related Allowance, Interest Income Recognized | 102 | 381 |
Real Estate Construction and Land Develolpment [Member] | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
Impaired Loans, With No Related Allowance, Recorded Investment | 1,599 | 1,800 |
Impaired Loans, With No Related Allowance, Unpaid Principal Balance | 1,599 | 2,101 |
Impaired Loans, With No Related Allowance, Average Recorded Investment | 1,436 | 2,101 |
Impaired Loans, With No Related Allowance, Interest Income Recognized | 2 | 48 |
Impaired Loans, With Related Allowance, Recorded Investment | 576 | 0 |
Impaired Loans, With Related Allowance, Unpaid Principal Balance | 868 | 0 |
Impaired Loans, With Related Allowance, Related Loan Loss Allowance | 26 | 0 |
Impaired Loans, With Related Allowance, Average Recorded Investment | 868 | 0 |
Impaired Loans, With Related Allowance, Interest Income Recognized | 8 | 0 |
Commercial Real Estate [Member] | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
Impaired Loans, With No Related Allowance, Recorded Investment | 11,294 | 13,247 |
Impaired Loans, With No Related Allowance, Unpaid Principal Balance | 13,974 | 16,943 |
Impaired Loans, With No Related Allowance, Average Recorded Investment | 14,128 | 18,001 |
Impaired Loans, With No Related Allowance, Interest Income Recognized | 143 | 646 |
Impaired Loans, With Related Allowance, Recorded Investment | 5,986 | 4,386 |
Impaired Loans, With Related Allowance, Unpaid Principal Balance | 7,288 | 4,619 |
Impaired Loans, With Related Allowance, Related Loan Loss Allowance | 619 | 541 |
Impaired Loans, With Related Allowance, Average Recorded Investment | 7,328 | 4,679 |
Impaired Loans, With Related Allowance, Interest Income Recognized | 37 | 206 |
Home Equity Line of Credit [Member] | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
Impaired Loans, With No Related Allowance, Recorded Investment | 330 | 353 |
Impaired Loans, With No Related Allowance, Unpaid Principal Balance | 529 | 548 |
Impaired Loans, With No Related Allowance, Average Recorded Investment | 529 | 549 |
Impaired Loans, With No Related Allowance, Interest Income Recognized | 4 | 23 |
Impaired Loans, With Related Allowance, Recorded Investment | 196 | 201 |
Impaired Loans, With Related Allowance, Unpaid Principal Balance | 245 | 245 |
Impaired Loans, With Related Allowance, Related Loan Loss Allowance | 29 | 24 |
Impaired Loans, With Related Allowance, Average Recorded Investment | 245 | 245 |
Impaired Loans, With Related Allowance, Interest Income Recognized | 5 | 14 |
Residential Real Estate [Member] | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
Impaired Loans, With No Related Allowance, Recorded Investment | 3,830 | 3,654 |
Impaired Loans, With No Related Allowance, Unpaid Principal Balance | 4,172 | 3,914 |
Impaired Loans, With No Related Allowance, Average Recorded Investment | 4,203 | 4,099 |
Impaired Loans, With No Related Allowance, Interest Income Recognized | 44 | 210 |
Impaired Loans, With Related Allowance, Recorded Investment | 2,055 | 1,812 |
Impaired Loans, With Related Allowance, Unpaid Principal Balance | 2,122 | 1,878 |
Impaired Loans, With Related Allowance, Related Loan Loss Allowance | 195 | 102 |
Impaired Loans, With Related Allowance, Average Recorded Investment | 2,145 | 1,928 |
Impaired Loans, With Related Allowance, Interest Income Recognized | 30 | 79 |
Real Estate [Member] | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
Impaired Loans, With No Related Allowance, Recorded Investment | 17,053 | 19,054 |
Impaired Loans, With No Related Allowance, Unpaid Principal Balance | 20,274 | 23,506 |
Impaired Loans, With No Related Allowance, Average Recorded Investment | 20,296 | 24,750 |
Impaired Loans, With No Related Allowance, Interest Income Recognized | 193 | 927 |
Impaired Loans, With Related Allowance, Recorded Investment | 8,813 | 6,399 |
Impaired Loans, With Related Allowance, Unpaid Principal Balance | 10,523 | 6,742 |
Impaired Loans, With Related Allowance, Related Loan Loss Allowance | 869 | 667 |
Impaired Loans, With Related Allowance, Average Recorded Investment | 10,586 | 6,852 |
Impaired Loans, With Related Allowance, Interest Income Recognized | 80 | 299 |
Commercial and Industrial, Real Estate Loans [Member] | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
Impaired Loans, With No Related Allowance, Recorded Investment | 1,150 | 1,850 |
Impaired Loans, With No Related Allowance, Unpaid Principal Balance | 1,782 | 2,950 |
Impaired Loans, With No Related Allowance, Average Recorded Investment | 1,782 | 3,071 |
Impaired Loans, With No Related Allowance, Interest Income Recognized | 0 | 97 |
Impaired Loans, With Related Allowance, Recorded Investment | 2,374 | 1,965 |
Impaired Loans, With Related Allowance, Unpaid Principal Balance | 2,867 | 2,443 |
Impaired Loans, With Related Allowance, Related Loan Loss Allowance | 1,940 | 1,396 |
Impaired Loans, With Related Allowance, Average Recorded Investment | 2,882 | 2,556 |
Impaired Loans, With Related Allowance, Interest Income Recognized | 22 | 82 |
Consumer Other Financing Receivable [Member] | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
Impaired Loans, With No Related Allowance, Recorded Investment | 0 | 0 |
Impaired Loans, With No Related Allowance, Unpaid Principal Balance | 0 | 25 |
Impaired Loans, With No Related Allowance, Average Recorded Investment | 0 | 25 |
Impaired Loans, With No Related Allowance, Interest Income Recognized | 0 | 1 |
Impaired Loans, With Related Allowance, Recorded Investment | 45 | 0 |
Impaired Loans, With Related Allowance, Unpaid Principal Balance | 45 | 0 |
Impaired Loans, With Related Allowance, Related Loan Loss Allowance | 45 | 0 |
Impaired Loans, With Related Allowance, Average Recorded Investment | 46 | 0 |
Impaired Loans, With Related Allowance, Interest Income Recognized | 0 | 0 |
Impaired Loans [Member] | ' | ' |
Financing Receivable, Impaired [Line Items] | ' | ' |
Impaired Loans, With Related Allowance, Recorded Investment | 29,435 | 29,268 |
Impaired Loans, With Related Allowance, Unpaid Principal Balance | 35,491 | 35,666 |
Impaired Loans, With Related Allowance, Related Loan Loss Allowance | 2,854 | 2,063 |
Impaired Loans, With Related Allowance, Average Recorded Investment | 35,592 | 37,254 |
Impaired Loans, With Related Allowance, Interest Income Recognized | $295 | $1,406 |