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Loans, net and allowance for loan losses - Summarize Information in Concerning to Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment, With no related allowance, Total | $ 14,834 | $ 2,008 | $ 18,568
Average Recorded Investment, With an allowance recorded, Total | 3,886 | 3,398 | 4,263
Unpaid Principal Balance, With no related allowance, Total | 20,780 | 2,008 | 26,353
Interest Income Recognized, With an allowance recorded, Total | 44 | 26 | 184
Average Recorded Investment, With no related allowance, Total | 16,701 | 1,708 | 18,628
Interest Income Recognized, With no related allowance, Total |  |  |
Recorded Investment, With an allowance recorded, Total | 3,393 | 2,932 | 4,378
Unpaid Principal Balance, With an allowance recorded, Total | 3,393 | 2,932 | 4,378
Related Allowance, With an allowance recorded, Total | 1,832 | 861 | 2,024
Recorded Investment, Total | 18,227 | 4,940 | 22,946
Average Recorded Investment, Total | 20,587 | 5,106 | 22,891
Unpaid Principal Balance, Total | 24,173 | 4,940 | 30,731
Interest Income Recognized, Total | 44 | 26 | 184
Related Allowance, With an allowance recorded, Total | 1,832 | 861 | 2,024
Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment, With no related allowance, Total | 2,008 | 338 | 4,978
Average Recorded Investment, With an allowance recorded, Total | 1,964 | 350 | 2,182
Unpaid Principal Balance, With no related allowance, Total | 4,762 | 338 | 9,474
Interest Income Recognized, With an allowance recorded, Total | 26 | 4 | 95
Average Recorded Investment, With no related allowance, Total | 3,493 | 321 | 5,824
Interest Income Recognized, With no related allowance, Total |  |  |
Recorded Investment, With an allowance recorded, Total | 1,728 | 349 | 2,200
Unpaid Principal Balance, With an allowance recorded, Total | 1,728 | 349 | 2,200
Related Allowance, With an allowance recorded, Total | 1,128 | 349 | 1,500
Recorded Investment, Total | 3,736 | 687 | 7,178
Average Recorded Investment, Total | 5,457 | 671 | 8,006
Unpaid Principal Balance, Total | 6,490 | 687 | 11,674
Interest Income Recognized, Total | 26 | 4 | 95
Related Allowance, With an allowance recorded, Total | 1,128 | 349 | 1,500
Real Estate Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment, With no related allowance, Total | 9,958 | 262 | 10,496
Average Recorded Investment, With an allowance recorded, Total | 1,399 | 1,731 | 1,409
Unpaid Principal Balance, With no related allowance, Total | 12,746 | 262 | 13,352
Interest Income Recognized, With an allowance recorded, Total | 18 | 19 | 76
Average Recorded Investment, With no related allowance, Total | 10,227 | 204 | 10,095
Interest Income Recognized, With no related allowance, Total |  |  |
Recorded Investment, With an allowance recorded, Total | 1,404 | 1,446 | 1,394
Unpaid Principal Balance, With an allowance recorded, Total | 1,404 | 1,446 | 1,394
Related Allowance, With an allowance recorded, Total | 542 | 300 | 300
Recorded Investment, Total | 11,362 | 1,708 | 11,890
Average Recorded Investment, Total | 11,626 | 1,935 | 11,504
Unpaid Principal Balance, Total | 14,150 | 1,708 | 14,746
Interest Income Recognized, Total | 18 | 19 | 76
Related Allowance, With an allowance recorded, Total | 542 | 300 | 300
Real Estate Residential [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment, With no related allowance, Total | 2,740 | 1,321 | 3,004
Average Recorded Investment, With an allowance recorded, Total | 523 | 1,317 | 672
Unpaid Principal Balance, With no related allowance, Total | 3,144 | 1,321 | 3,437
Interest Income Recognized, With an allowance recorded, Total |  | 3 | 13
Average Recorded Investment, With no related allowance, Total | 2,872 | 1,125 | 2,614
Interest Income Recognized, With no related allowance, Total |  |  |
Recorded Investment, With an allowance recorded, Total | 261 | 1,137 | 784
Unpaid Principal Balance, With an allowance recorded, Total | 261 | 1,137 | 784
Related Allowance, With an allowance recorded, Total | 162 | 212 | 224
Recorded Investment, Total | 3,001 | 2,458 | 3,788
Average Recorded Investment, Total | 3,395 | 2,442 | 3,286
Unpaid Principal Balance, Total | 3,405 | 2,458 | 4,221
Interest Income Recognized, Total |  | 3 | 13
Related Allowance, With an allowance recorded, Total | 162 | 212 | 224
Consumer [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment, With no related allowance, Total | 128 | 87 | 90
Average Recorded Investment, With an allowance recorded, Total |  |  |
Unpaid Principal Balance, With no related allowance, Total | 128 | 87 | 90
Interest Income Recognized, With an allowance recorded, Total |  |  |
Average Recorded Investment, With no related allowance, Total | 109 | 58 | 95
Interest Income Recognized, With no related allowance, Total |  |  |
Recorded Investment, With an allowance recorded, Total |  |  |
Unpaid Principal Balance, With an allowance recorded, Total |  |  |
Related Allowance, With an allowance recorded, Total |  |  |
Recorded Investment, Total | 128 | 87 | 90
Average Recorded Investment, Total | 109 | 58 | 95
Unpaid Principal Balance, Total | 128 | 87 | 90
Interest Income Recognized, Total |  |  |
Related Allowance, With an allowance recorded, Total |  |  |

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