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Bank segment - Principal balance of impaired loans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Recorded investment:          
With no related allowance recorded $ 14,492   $ 14,492   $ 18,811
With an allowance recorded 19,609   19,609   32,948
Recorded investment 34,101   34,101   51,759
Unpaid principal balance:          
With no related allowance recorded 18,725   18,725   23,200
With an allowance recorded 19,840   19,840   33,205
Unpaid principal balance 38,565   38,565   56,405
Related Allowance 3,129   3,129   4,083
Average recorded investment:          
With no related allowance recorded 14,873 $ 22,715 16,258 $ 19,993  
With an allowance recorded 19,880 37,610 22,582 36,893  
Average recorded investment 34,753 60,325 38,840 56,886  
Interest income recognized:          
With no related allowance recorded 148 183 278 256  
With an allowance recorded 271 377 891 623  
Interest income recognized 419 560 1,169 879  
Residential 1-4 family          
Recorded investment:          
With no related allowance recorded 9,364   9,364   9,571
With an allowance recorded 9,824   9,824   10,283
Recorded investment 19,188   19,188   19,854
Unpaid principal balance:          
With no related allowance recorded 9,963   9,963   10,400
With an allowance recorded 10,027   10,027   10,486
Unpaid principal balance 19,990   19,990   20,886
Related Allowance 1,332   1,332   1,352
Average recorded investment:          
With no related allowance recorded 9,304 10,672 9,429 10,532  
With an allowance recorded 10,054 11,982 10,051 12,000  
Average recorded investment 19,358 22,654 19,480 22,532  
Interest income recognized:          
With no related allowance recorded 76 152 160 203  
With an allowance recorded 117 115 236 237  
Interest income recognized 193 267 396 440  
Commercial real estate          
Recorded investment:          
With no related allowance recorded 0   0   223
With an allowance recorded 1,289   1,289   1,346
Recorded investment 1,289   1,289   1,569
Unpaid principal balance:          
With no related allowance recorded 0   0   228
With an allowance recorded 1,289   1,289   1,346
Unpaid principal balance 1,289   1,289   1,574
Related Allowance 73   73   80
Average recorded investment:          
With no related allowance recorded 143 1,152 182 1,163  
With an allowance recorded 1,292 2,519 1,296 1,686  
Average recorded investment 1,435 3,671 1,478 2,849  
Interest income recognized:          
With no related allowance recorded 11 0 11 0  
With an allowance recorded 14 0 28 0  
Interest income recognized 25 0 39 0  
Home equity line of credit          
Recorded investment:          
With no related allowance recorded 2,287   2,287   1,500
With an allowance recorded 4,397   4,397   4,658
Recorded investment 6,684   6,684   6,158
Unpaid principal balance:          
With no related allowance recorded 2,707   2,707   1,900
With an allowance recorded 4,425   4,425   4,712
Unpaid principal balance 7,132   7,132   6,612
Related Allowance 275   275   215
Average recorded investment:          
With no related allowance recorded 2,401 1,038 2,203 943  
With an allowance recorded 4,372 3,299 4,467 3,122  
Average recorded investment 6,773 4,337 6,670 4,065  
Interest income recognized:          
With no related allowance recorded 51 9 65 9  
With an allowance recorded 47 28 96 55  
Interest income recognized 98 37 161 64  
Residential land          
Recorded investment:          
With no related allowance recorded 1,249   1,249   1,218
With an allowance recorded 1,340   1,340   2,411
Recorded investment 2,589   2,589   3,629
Unpaid principal balance:          
With no related allowance recorded 1,788   1,788   1,803
With an allowance recorded 1,340   1,340   2,411
Unpaid principal balance 3,128   3,128   4,214
Related Allowance 480   480   789
Average recorded investment:          
With no related allowance recorded 1,075 1,484 1,016 1,537  
With an allowance recorded 1,532 2,977 1,804 3,177  
Average recorded investment 2,607 4,461 2,820 4,714  
Interest income recognized:          
With no related allowance recorded 8 15 34 31  
With an allowance recorded 24 54 61 121  
Interest income recognized 32 69 95 152  
Commercial construction          
Recorded investment:          
With no related allowance recorded 0   0   0
With an allowance recorded 0   0   0
Recorded investment 0   0   0
Unpaid principal balance:          
With no related allowance recorded 0   0   0
With an allowance recorded 0   0   0
Unpaid principal balance 0   0   0
Related Allowance 0   0   0
Average recorded investment:          
With no related allowance recorded 0 0 0 0  
With an allowance recorded 0 0 0 0  
Average recorded investment 0 0 0 0  
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  
Residential construction          
Recorded investment:          
With no related allowance recorded 0   0   0
With an allowance recorded 0   0   0
Recorded investment 0   0   0
Unpaid principal balance:          
With no related allowance recorded 0   0   0
With an allowance recorded 0   0   0
Unpaid principal balance 0   0   0
Related Allowance 0   0   0
Average recorded investment:          
With no related allowance recorded 0 0 0 0  
With an allowance recorded 0 0 0 0  
Average recorded investment 0 0 0 0  
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  
Commercial loans          
Recorded investment:          
With no related allowance recorded 1,592   1,592   6,299
With an allowance recorded 2,691   2,691   14,240
Recorded investment 4,283   4,283   20,539
Unpaid principal balance:          
With no related allowance recorded 4,267   4,267   8,869
With an allowance recorded 2,691   2,691   14,240
Unpaid principal balance 6,958   6,958   23,109
Related Allowance 939   939   1,641
Average recorded investment:          
With no related allowance recorded 1,949 8,369 3,428 5,818  
With an allowance recorded 2,562 16,821 4,915 16,896  
Average recorded investment 4,511 25,190 8,343 22,714  
Interest income recognized:          
With no related allowance recorded 2 7 8 13  
With an allowance recorded 68 180 469 210  
Interest income recognized 70 187 477 223  
Consumer loans          
Recorded investment:          
With no related allowance recorded 0   0   0
With an allowance recorded 68   68   10
Recorded investment 68   68   10
Unpaid principal balance:          
With no related allowance recorded 0   0   0
With an allowance recorded 68   68   10
Unpaid principal balance 68   68   10
Related Allowance 30   30   $ 6
Average recorded investment:          
With no related allowance recorded 1 0 0 0  
With an allowance recorded 68 12 49 12  
Average recorded investment 69 12 49 12  
Interest income recognized:          
With no related allowance recorded 0 0 0 0  
With an allowance recorded 1 0 1 0  
Interest income recognized $ 1 $ 0 $ 1 $ 0