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Bank segment - Principal balance of impaired loans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Recorded investment:          
With no related allowance recorded $ 29,338   $ 29,338   $ 19,806
With an allowance recorded 29,835   29,835   33,879
Recorded investment 59,173   59,173   53,685
Unpaid principal balance:          
With no related allowance recorded 33,045   33,045   22,934
With an allowance recorded 30,332   30,332   34,696
Unpaid principal balance 63,377   63,377   57,630
Related Allowance 6,180   6,180   6,320
Average recorded investment:          
With no related allowance recorded 22,715 $ 20,614 19,993 $ 21,527  
With an allowance recorded 37,610 27,995 36,893 27,399  
Average recorded investment 60,325 48,609 56,886 48,926  
Interest income recognized:          
With no related allowance recorded 183 250 256 394  
With an allowance recorded 377 258 623 523  
Interest income recognized 560 508 879 917  
Residential 1-4 family          
Recorded investment:          
With no related allowance recorded 10,262   10,262   10,596
With an allowance recorded 12,017   12,017   11,861
Recorded investment 22,279   22,279   22,457
Unpaid principal balance:          
With no related allowance recorded 11,381   11,381   11,805
With an allowance recorded 12,220   12,220   11,914
Unpaid principal balance 23,601   23,601   23,719
Related Allowance 1,709   1,709   1,453
Average recorded investment:          
With no related allowance recorded 10,672 11,193 10,532 11,373  
With an allowance recorded 11,982 11,794 12,000 11,651  
Average recorded investment 22,654 22,987 22,532 23,024  
Interest income recognized:          
With no related allowance recorded 152 66 203 155  
With an allowance recorded 115 130 237 256  
Interest income recognized 267 196 440 411  
Commercial real estate          
Recorded investment:          
With no related allowance recorded 1,144   1,144   1,188
With an allowance recorded 2,486   2,486   0
Recorded investment 3,630   3,630   1,188
Unpaid principal balance:          
With no related allowance recorded 1,422   1,422   1,436
With an allowance recorded 2,526   2,526   0
Unpaid principal balance 3,948   3,948   1,436
Related Allowance 172   172   0
Average recorded investment:          
With no related allowance recorded 1,152 530 1,163 543  
With an allowance recorded 2,519 1,474 1,686 2,978  
Average recorded investment 3,671 2,004 2,849 3,521  
Interest income recognized:          
With no related allowance recorded 0 0 0 0  
With an allowance recorded 0 0 0 0  
Interest income recognized 0 0 0 0  
Home equity line of credit          
Recorded investment:          
With no related allowance recorded 1,020   1,020   707
With an allowance recorded 3,626   3,626   2,518
Recorded investment 4,646   4,646   3,225
Unpaid principal balance:          
With no related allowance recorded 1,288   1,288   948
With an allowance recorded 3,699   3,699   2,579
Unpaid principal balance 4,987   4,987   3,527
Related Allowance 826   826   442
Average recorded investment:          
With no related allowance recorded 1,038 433 943 417  
With an allowance recorded 3,299 1,212 3,122 919  
Average recorded investment 4,337 1,645 4,065 1,336  
Interest income recognized:          
With no related allowance recorded 9 1 9 2  
With an allowance recorded 28 8 55 14  
Interest income recognized 37 9 64 16  
Residential land          
Recorded investment:          
With no related allowance recorded 1,482   1,482   1,644
With an allowance recorded 2,971   2,971   4,039
Recorded investment 4,453   4,453   5,683
Unpaid principal balance:          
With no related allowance recorded 2,178   2,178   2,412
With an allowance recorded 2,971   2,971   4,117
Unpaid principal balance 5,149   5,149   6,529
Related Allowance 819   819   891
Average recorded investment:          
With no related allowance recorded 1,484 3,026 1,537 2,831  
With an allowance recorded 2,977 4,142 3,177 4,666  
Average recorded investment 4,461 7,168 4,714 7,497  
Interest income recognized:          
With no related allowance recorded 15 44 31 96  
With an allowance recorded 54 84 121 167  
Interest income recognized 69 128 152 263  
Commercial loans          
Recorded investment:          
With no related allowance recorded 15,430   15,430   5,671
With an allowance recorded 8,723   8,723   15,448
Recorded investment 24,153   24,153   21,119
Unpaid principal balance:          
With no related allowance recorded 16,776   16,776   6,333
With an allowance recorded 8,904   8,904   16,073
Unpaid principal balance 25,680   25,680   22,406
Related Allowance 2,647   2,647   3,527
Average recorded investment:          
With no related allowance recorded 8,369 5,432 5,818 6,363  
With an allowance recorded 16,821 9,358 16,896 7,170  
Average recorded investment 25,190 14,790 22,714 13,533  
Interest income recognized:          
With no related allowance recorded 7 139 13 141  
With an allowance recorded 180 36 210 86  
Interest income recognized 187 175 223 227  
Consumer loans          
Recorded investment:          
With no related allowance recorded         0
With an allowance recorded 12   12   13
Recorded investment 12   12   13
Unpaid principal balance:          
With no related allowance recorded         0
With an allowance recorded 12   12   13
Unpaid principal balance 12   12   13
Related Allowance 7   7   $ 7
Average recorded investment:          
With no related allowance recorded   0   0  
With an allowance recorded 12 15 12 15  
Average recorded investment 12 15 12 15  
Interest income recognized:          
With an allowance recorded $ 0 $ 0 $ 0 $ 0