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Loans, net and allowance for loan losses - Summarized Information in Concerning to Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired      
Recorded Investment, With no related allowance, Total $ 5,653 $ 6,532 $ 7,128
Unpaid Principal Balance, With no related allowance, Total 7,017 7,482 8,774
Average Recorded Investment, With no related allowance, Total 6,468 7,053 8,041
Interest Income Recognized, With no related allowance, Total 117 88 154
Recorded Investment, With an allowance recorded, Total 3,988 4,190 6,451
Unpaid Principal Balance, With an allowance recorded, Total 4,386 4,481 6,452
Related Allowance, With an allowance recorded, Total 1,179 766 1,942
Average Recorded Investment, With an allowance recorded, Total 4,288 4,548 4,460
Interest Income Recognized, With an allowance recorded, Total 70 91 9
Recorded Investment, Total 9,641 10,722 13,579
Unpaid Principal Balance, Total 11,403 11,963 15,226
Related Allowance, With an allowance recorded, Total 1,179 766 1,942
Average Recorded Investment, Total 10,756 11,601 12,501
Interest Income Recognized, Total 187 179 163
Commercial      
Financing Receivable, Impaired      
Recorded Investment, With no related allowance, Total 1,562 1,279 2,404
Unpaid Principal Balance, With no related allowance, Total 1,900 1,439 3,213
Average Recorded Investment, With no related allowance, Total 1,318 1,668 1,461
Interest Income Recognized, With no related allowance, Total 67 43 48
Recorded Investment, With an allowance recorded, Total 675 1,184 283
Unpaid Principal Balance, With an allowance recorded, Total 675 1,218 283
Related Allowance, With an allowance recorded, Total 50 159 225
Average Recorded Investment, With an allowance recorded, Total 1,006 991 859
Interest Income Recognized, With an allowance recorded, Total 30 50  
Recorded Investment, Total 2,237 2,463 2,687
Unpaid Principal Balance, Total 2,575 2,657 3,496
Related Allowance, With an allowance recorded, Total 50 159 225
Average Recorded Investment, Total 2,324 2,659 2,320
Interest Income Recognized, Total 97 93 48
Real estate Commercial      
Financing Receivable, Impaired      
Recorded Investment, With no related allowance, Total 1,969 2,888 2,364
Unpaid Principal Balance, With no related allowance, Total 2,299 3,190 3,018
Average Recorded Investment, With no related allowance, Total 2,822 2,985 4,300
Interest Income Recognized, With no related allowance, Total 28 24 71
Recorded Investment, With an allowance recorded, Total 1,152 1,401 4,793
Unpaid Principal Balance, With an allowance recorded, Total 1,323 1,496 4,793
Related Allowance, With an allowance recorded, Total 403 263 1,197
Average Recorded Investment, With an allowance recorded, Total 1,676 2,202 2,366
Interest Income Recognized, With an allowance recorded, Total 18 18 2
Recorded Investment, Total 3,121 4,289 7,157
Unpaid Principal Balance, Total 3,622 4,686 7,811
Related Allowance, With an allowance recorded, Total 403 263 1,197
Average Recorded Investment, Total 4,498 5,187 6,666
Interest Income Recognized, Total 46 42 73
Real estate Residential      
Financing Receivable, Impaired      
Recorded Investment, With no related allowance, Total 1,970 2,196 2,205
Unpaid Principal Balance, With no related allowance, Total 2,658 2,672 2,388
Average Recorded Investment, With no related allowance, Total 2,193 2,227 2,133
Interest Income Recognized, With no related allowance, Total 22 21 35
Recorded Investment, With an allowance recorded, Total 2,101 1,597 1,375
Unpaid Principal Balance, With an allowance recorded, Total 2,328 1,759 1,376
Related Allowance, With an allowance recorded, Total 666 336 520
Average Recorded Investment, With an allowance recorded, Total 1,585 1,335 1,185
Interest Income Recognized, With an allowance recorded, Total 22 23 7
Recorded Investment, Total 4,071 3,793 3,580
Unpaid Principal Balance, Total 4,986 4,431 3,764
Related Allowance, With an allowance recorded, Total 666 336 520
Average Recorded Investment, Total 3,778 3,562 3,318
Interest Income Recognized, Total 44 44 42
Consumer      
Financing Receivable, Impaired      
Recorded Investment, With no related allowance, Total 152 169 155
Unpaid Principal Balance, With no related allowance, Total 160 181 155
Average Recorded Investment, With no related allowance, Total 135 173 147
Recorded Investment, With an allowance recorded, Total 60 8  
Unpaid Principal Balance, With an allowance recorded, Total 60 8  
Related Allowance, With an allowance recorded, Total 60 8  
Average Recorded Investment, With an allowance recorded, Total 21 20 50
Recorded Investment, Total 212 177 155
Unpaid Principal Balance, Total 220 189 155
Related Allowance, With an allowance recorded, Total 60 8  
Average Recorded Investment, Total $ 156 $ 193 $ 197