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Loans and allowance for loan losses (Details 3) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
With no related allowance recorded:    
Recorded Investment $ 5,528 $ 5,494
Unpaid Principal Balance 6,129 6,086
Average Recorded Investment 5,549 6,945
With an allowance recorded:    
Recorded Investment 187 178
Unpaid Principal Balance 208 191
Related Allowance 65 50
Average Recorded Investment 183 667
Total:    
Recorded Investment 5,715 5,672
Unpaid Principal Balance 6,337 6,277
Related Allowance 65 50
Average Recorded Investment 5,732 7,612
Commercial real estate | Construction    
With no related allowance recorded:    
Recorded Investment 0 0
Unpaid Principal Balance 0 0
Average Recorded Investment 0 563
With an allowance recorded:    
Recorded Investment 0 0
Unpaid Principal Balance 0 0
Related Allowance 0 0
Average Recorded Investment 0 0
Total:    
Recorded Investment 0 0
Unpaid Principal Balance 0 0
Related Allowance 0 0
Average Recorded Investment 0 563
Commercial real estate | Non-residential    
With no related allowance recorded:    
Recorded Investment 2,507 2,507
Unpaid Principal Balance 2,601 2,601
Average Recorded Investment 2,507 3,023
With an allowance recorded:    
Recorded Investment 0 0
Unpaid Principal Balance 0 0
Related Allowance 0 0
Average Recorded Investment 0 451
Total:    
Recorded Investment 2,507 2,507
Unpaid Principal Balance 2,601 2,601
Related Allowance 0 0
Average Recorded Investment 2,507 3,474
Commercial real estate | Multifamily    
With no related allowance recorded:    
Recorded Investment 0 0
Unpaid Principal Balance 0 0
Average Recorded Investment 0 0
With an allowance recorded:    
Recorded Investment 0 0
Unpaid Principal Balance 0 0
Related Allowance 0 0
Average Recorded Investment 0 0
Total:    
Recorded Investment 0 0
Unpaid Principal Balance 0 0
Related Allowance 0 0
Average Recorded Investment 0 0
Residential    
With no related allowance recorded:    
Recorded Investment 2,208 2,208
Unpaid Principal Balance 2,515 2,523
Average Recorded Investment 2,246 2,196
With an allowance recorded:    
Recorded Investment 0 0
Unpaid Principal Balance 0 0
Related Allowance 0 0
Average Recorded Investment 0 0
Total:    
Recorded Investment 2,208 2,208
Unpaid Principal Balance 2,515 2,523
Related Allowance 0 0
Average Recorded Investment 2,246 2,196
Consumer | Indirect automobile    
With no related allowance recorded:    
Recorded Investment 337 274
Unpaid Principal Balance 392 320
Average Recorded Investment 305 242
With an allowance recorded:    
Recorded Investment 187 178
Unpaid Principal Balance 208 191
Related Allowance 65 50
Average Recorded Investment 183 205
Total:    
Recorded Investment 524 452
Unpaid Principal Balance 600 511
Related Allowance 65 50
Average Recorded Investment 488 447
Consumer | Home equity    
With no related allowance recorded:    
Recorded Investment 192 198
Unpaid Principal Balance 208 211
Average Recorded Investment 195 158
With an allowance recorded:    
Recorded Investment 0 0
Unpaid Principal Balance 0 0
Related Allowance 0 0
Average Recorded Investment 0 0
Total:    
Recorded Investment 192 198
Unpaid Principal Balance 208 211
Related Allowance 0 0
Average Recorded Investment 195 158
Consumer | Other consumer    
With no related allowance recorded:    
Recorded Investment 4 10
Unpaid Principal Balance 4 10
Average Recorded Investment 7 5
With an allowance recorded:    
Recorded Investment 0 0
Unpaid Principal Balance 0 0
Related Allowance 0 0
Average Recorded Investment 0 2
Total:    
Recorded Investment 4 10
Unpaid Principal Balance 4 10
Related Allowance 0 0
Average Recorded Investment 7 7
Commercial and industrial    
With no related allowance recorded:    
Recorded Investment 280 297
Unpaid Principal Balance 409 421
Average Recorded Investment 289 758
With an allowance recorded:    
Recorded Investment 0 0
Unpaid Principal Balance 0 0
Related Allowance 0 0
Average Recorded Investment 0 9
Total:    
Recorded Investment 280 297
Unpaid Principal Balance 409 421
Related Allowance 0 0
Average Recorded Investment $ 289 $ 767