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Loans, net and allowance for loan losses - Summarized Information in Concerning to Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Financing Receivable, Impaired          
Recorded Investment, With no related allowance, Total $ 7,278 $ 7,684 $ 7,278 $ 7,684 $ 6,532
Unpaid Principal Balance, With no related allowance, Total 8,356 8,557 8,356 8,557 7,482
Average Recorded Investment, With no related allowance, Total 6,769 7,297 6,673 7,184 7,053
Interest Income Recognized, With no related allowance, Total 29 38 85 92 88
Recorded Investment, With an allowance recorded, Total 3,934 4,088 3,934 4,088 4,190
Unpaid Principal Balance, With an allowance recorded, Total 4,382 4,669 4,382 4,669 4,481
Related Allowance, With an allowance recorded, Total 931 1,706 931 1,706 766
Average Recorded Investment, With an allowance recorded, Total 4,110 3,820 4,363 4,638 4,548
Interest Income Recognized, With an allowance recorded, Total 20 14 54 35 91
Recorded Investment, Total 11,212 11,772 11,212 11,772 10,722
Unpaid Principal Balance, Total 12,738 13,226 12,738 13,226 11,963
Related Allowance, With an allowance recorded, Total 931 1,706 931 1,706 766
Average Recorded Investment, Total 10,879 11,117 11,036 11,822 11,601
Interest Income Recognized, Total 49 52 139 127 179
Commercial          
Financing Receivable, Impaired          
Recorded Investment, With no related allowance, Total 1,356 2,310 1,356 2,310 1,279
Unpaid Principal Balance, With no related allowance, Total 1,538 2,455 1,538 2,455 1,439
Average Recorded Investment, With no related allowance, Total 1,269 1,945 1,257 1,765 1,668
Interest Income Recognized, With no related allowance, Total 17 28 50 63 43
Recorded Investment, With an allowance recorded, Total 939 833 939 833 1,184
Unpaid Principal Balance, With an allowance recorded, Total 1,086 910 1,086 910 1,218
Related Allowance, With an allowance recorded, Total 93 436 93 436 159
Average Recorded Investment, With an allowance recorded, Total 1,020 783 1,089 943 991
Interest Income Recognized, With an allowance recorded, Total 7   23   50
Recorded Investment, Total 2,295 3,143 2,295 3,143 2,463
Unpaid Principal Balance, Total 2,624 3,365 2,624 3,365 2,657
Related Allowance, With an allowance recorded, Total 93 436 93 436 159
Average Recorded Investment, Total 2,289 2,728 2,346 2,708 2,659
Interest Income Recognized, Total 24 28 73 63 93
Real estate Commercial          
Financing Receivable, Impaired          
Recorded Investment, With no related allowance, Total 3,414 2,900 3,414 2,900 2,888
Unpaid Principal Balance, With no related allowance, Total 3,666 3,192 3,666 3,192 3,190
Average Recorded Investment, With no related allowance, Total 3,143 2,979 3,036 3,009 2,985
Interest Income Recognized, With no related allowance, Total 5 6 20 19 24
Recorded Investment, With an allowance recorded, Total 1,669 1,807 1,669 1,807 1,401
Unpaid Principal Balance, With an allowance recorded, Total 1,774 2,073 1,774 2,073 1,496
Related Allowance, With an allowance recorded, Total 462 631 462 631 263
Average Recorded Investment, With an allowance recorded, Total 1,712 1,673 1,807 2,402 2,202
Interest Income Recognized, With an allowance recorded, Total 8 6 18 13 18
Recorded Investment, Total 5,083 4,707 5,083 4,707 4,289
Unpaid Principal Balance, Total 5,440 5,265 5,440 5,265 4,686
Related Allowance, With an allowance recorded, Total 462 631 462 631 263
Average Recorded Investment, Total 4,855 4,652 4,843 5,411 5,187
Interest Income Recognized, Total 13 12 38 32 42
Real estate Residential          
Financing Receivable, Impaired          
Recorded Investment, With no related allowance, Total 2,366 2,303 2,366 2,303 2,196
Unpaid Principal Balance, With no related allowance, Total 3,003 2,727 3,003 2,727 2,672
Average Recorded Investment, With no related allowance, Total 2,256 2,193 2,249 2,235 2,227
Interest Income Recognized, With no related allowance, Total 7 4 15 10 21
Recorded Investment, With an allowance recorded, Total 1,312 1,425 1,312 1,425 1,597
Unpaid Principal Balance, With an allowance recorded, Total 1,508 1,663 1,508 1,663 1,759
Related Allowance, With an allowance recorded, Total 362 616 362 616 336
Average Recorded Investment, With an allowance recorded, Total 1,369 1,330 1,456 1,270 1,335
Interest Income Recognized, With an allowance recorded, Total 5 8 13 22 23
Recorded Investment, Total 3,678 3,728 3,678 3,728 3,793
Unpaid Principal Balance, Total 4,511 4,390 4,511 4,390 4,431
Related Allowance, With an allowance recorded, Total 362 616 362 616 336
Average Recorded Investment, Total 3,625 3,523 3,705 3,505 3,562
Interest Income Recognized, Total 12 12 28 32 44
Consumer          
Financing Receivable, Impaired          
Recorded Investment, With no related allowance, Total 142 171 142 171 169
Unpaid Principal Balance, With no related allowance, Total 149 183 149 183 181
Average Recorded Investment, With no related allowance, Total 101 180 131 175 173
Recorded Investment, With an allowance recorded, Total 14 23 14 23 8
Unpaid Principal Balance, With an allowance recorded, Total 14 23 14 23 8
Related Allowance, With an allowance recorded, Total 14 23 14 23 8
Average Recorded Investment, With an allowance recorded, Total 9 34 11 23 20
Recorded Investment, Total 156 194 156 194 177
Unpaid Principal Balance, Total 163 206 163 206 189
Related Allowance, With an allowance recorded, Total 14 23 14 23 8
Average Recorded Investment, Total $ 110 $ 214 $ 142 $ 198 $ 193