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Loans, net and allowance for loan losses - Summarize Information in Concerning to Impaired Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | $ 8,911 | $ 6,532 | $ 8,911 | $ 6,532 | $ 7,162
Unpaid Principal Balance, With no related allowance, Total | 10,840 | 8,953 | 10,840 | 8,953 | 9,390
Average Recorded Investment, With no related allowance, Total | 7,777 | 6,667 | 7,339 | 7,048 | 6,923
Interest Income Recognized, With no related allowance, Total | 47 | 46 | 102 | 86 | 186
Recorded Investment, With an allowance recorded, Total | 2,864 | 8,471 | 2,864 | 8,471 | 5,473
Unpaid Principal Balance, With an allowance recorded, Total | 2,864 | 8,471 | 2,864 | 8,471 | 5,473
Related Allowance, With an allowance recorded, Total | 1,814 | 3,587 | 1,814 | 3,587 | 2,247
Average Recorded Investment, With an allowance recorded, Total | 4,058 | 7,884 | 4,710 | 7,399 | 7,737
Interest Income Recognized, With an allowance recorded, Total | 2 | 68 | 4 | 109 | 156
Recorded Investment, Total | 11,775 | 15,003 | 11,775 | 15,003 | 12,635
Unpaid Principal Balance, Total | 13,704 | 17,424 | 13,704 | 17,424 | 14,863
Related Allowance, With an allowance recorded, Total | 1,814 | 3,587 | 1,814 | 3,587 | 2,247
Average Recorded Investment, Total | 11,835 | 14,551 | 12,049 | 14,447 | 14,660
Interest Income Recognized, Total | 49 | 114 | 106 | 195 | 342
Commercial |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 1,296 | 1,658 | 1,296 | 1,658 | 1,352
Unpaid Principal Balance, With no related allowance, Total | 2,378 | 3,184 | 2,378 | 3,184 | 2,720
Average Recorded Investment, With no related allowance, Total | 1,235 | 1,989 | 1,249 | 2,168 | 1,848
Interest Income Recognized, With no related allowance, Total | 14 | 17 | 30 | 37 | 87
Recorded Investment, With an allowance recorded, Total | 615 | 1,312 | 615 | 1,312 | 795
Unpaid Principal Balance, With an allowance recorded, Total | 615 | 1,312 | 615 | 1,312 | 795
Related Allowance, With an allowance recorded, Total | 615 | 1,209 | 615 | 1,209 | 759
Average Recorded Investment, With an allowance recorded, Total | 878 | 1,469 | 923 | 1,533 | 1,680
Interest Income Recognized, With an allowance recorded, Total |  | 13 |  | 27 | 40
Recorded Investment, Total | 1,911 | 2,970 | 1,911 | 2,970 | 2,147
Unpaid Principal Balance, Total | 2,993 | 4,496 | 2,993 | 4,496 | 3,515
Related Allowance, With an allowance recorded, Total | 615 | 1,209 | 615 | 1,209 | 759
Average Recorded Investment, Total | 2,113 | 3,458 | 2,172 | 3,701 | 3,528
Interest Income Recognized, Total | 14 | 30 | 30 | 64 | 127
Real estate Commercial |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 5,517 | 2,140 | 5,517 | 2,140 | 2,731
Unpaid Principal Balance, With no related allowance, Total | 6,181 | 2,852 | 6,181 | 2,852 | 3,408
Average Recorded Investment, With no related allowance, Total | 4,340 | 2,169 | 3,643 | 2,366 | 2,394
Interest Income Recognized, With no related allowance, Total | 30 | 28 | 61 | 47 | 95
Recorded Investment, With an allowance recorded, Total | 899 | 5,316 | 899 | 5,316 | 2,643
Unpaid Principal Balance, With an allowance recorded, Total | 899 | 5,316 | 899 | 5,316 | 2,643
Related Allowance, With an allowance recorded, Total | 405 | 1,445 | 405 | 1,445 | 233
Average Recorded Investment, With an allowance recorded, Total | 1,964 | 4,628 | 2,400 | 4,182 | 4,155
Interest Income Recognized, With an allowance recorded, Total |  | 48 |  | 65 | 86
Recorded Investment, Total | 6,416 | 7,456 | 6,416 | 7,456 | 5,374
Unpaid Principal Balance, Total | 7,080 | 8,168 | 7,080 | 8,168 | 6,051
Related Allowance, With an allowance recorded, Total | 405 | 1,445 | 405 | 1,445 | 233
Average Recorded Investment, Total | 6,304 | 6,797 | 6,043 | 6,548 | 6,549
Interest Income Recognized, Total | 30 | 76 | 61 | 112 | 181
Real estate Residential |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 1,941 | 2,734 | 1,941 | 2,734 | 3,048
Unpaid Principal Balance, With no related allowance, Total | 2,124 | 2,917 | 2,124 | 2,917 | 3,231
Average Recorded Investment, With no related allowance, Total | 2,079 | 2,503 | 2,355 | 2,488 | 2,664
Interest Income Recognized, With no related allowance, Total | 3 | 1 | 11 | 2 | 4
Recorded Investment, With an allowance recorded, Total | 1,279 | 1,706 | 1,279 | 1,706 | 1,918
Unpaid Principal Balance, With an allowance recorded, Total | 1,279 | 1,706 | 1,279 | 1,706 | 1,918
Related Allowance, With an allowance recorded, Total | 723 | 796 | 723 | 796 | 1,138
Average Recorded Investment, With an allowance recorded, Total | 1,136 | 1,673 | 1,295 | 1,593 | 1,776
Interest Income Recognized, With an allowance recorded, Total | 2 | 7 | 4 | 17 | 30
Recorded Investment, Total | 3,220 | 4,440 | 3,220 | 4,440 | 4,966
Unpaid Principal Balance, Total | 3,403 | 4,623 | 3,403 | 4,623 | 5,149
Related Allowance, With an allowance recorded, Total | 723 | 796 | 723 | 796 | 1,138
Average Recorded Investment, Total | 3,215 | 4,176 | 3,650 | 4,081 | 4,440
Interest Income Recognized, Total | 5 | 8 | 15 | 19 | 34
Consumer |  |  |  |  |
Financing Receivable, Impaired |  |  |  |  |
Recorded Investment, With no related allowance, Total | 157 |  | 157 |  | 31
Unpaid Principal Balance, With no related allowance, Total | 157 |  | 157 |  | 31
Average Recorded Investment, With no related allowance, Total | 123 | 6 | 92 | 26 | 17
Recorded Investment, With an allowance recorded, Total | 71 | 137 | 71 | 137 | 117
Unpaid Principal Balance, With an allowance recorded, Total | 71 | 137 | 71 | 137 | 117
Related Allowance, With an allowance recorded, Total | 71 | 137 | 71 | 137 | 117
Average Recorded Investment, With an allowance recorded, Total | 80 | 114 | 92 | 91 | 126
Recorded Investment, Total | 228 | 137 | 228 | 137 | 148
Unpaid Principal Balance, Total | 228 | 137 | 228 | 137 | 148
Related Allowance, With an allowance recorded, Total | 71 | 137 | 71 | 137 | 117
Average Recorded Investment, Total | $ 203 | $ 120 | $ 184 | $ 117 | $ 143

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