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Bank segment - Principal balance of impaired loans (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Recorded investment:    
With no related allowance recorded $ 19,149 $ 19,806
With an allowance recorded 41,572 33,879
Recorded investment 60,721 53,685
Unpaid principal balance:    
With no related allowance recorded 22,210 22,934
With an allowance recorded 42,548 34,696
Unpaid principal balance 64,758 57,630
Related Allowance 6,823 6,320
Average recorded investment:    
With no related allowance recorded 19,003 22,439
With an allowance recorded 36,177 26,804
Average recorded investment 55,180 49,243
Interest income recognized:    
With no related allowance recorded 73 144
With an allowance recorded 246 265
Interest income recognized 319 409
Residential 1-4 family    
Recorded investment:    
With no related allowance recorded 10,502 10,596
With an allowance recorded 12,083 11,861
Recorded investment 22,585 22,457
Unpaid principal balance:    
With no related allowance recorded 11,606 11,805
With an allowance recorded 12,286 11,914
Unpaid principal balance 23,892 23,719
Related Allowance 1,653 1,453
Average recorded investment:    
With no related allowance recorded 10,392 11,552
With an allowance recorded 12,018 11,510
Average recorded investment 22,410 23,062
Interest income recognized:    
With no related allowance recorded 51 89
With an allowance recorded 122 126
Interest income recognized 173 215
Commercial real estate    
Recorded investment:    
With no related allowance recorded 1,166 1,188
With an allowance recorded 2,561 0
Recorded investment 3,727 1,188
Unpaid principal balance:    
With no related allowance recorded 1,429 1,436
With an allowance recorded 2,570 0
Unpaid principal balance 3,999 1,436
Related Allowance 50 0
Average recorded investment:    
With no related allowance recorded 1,173 555
With an allowance recorded 854 4,482
Average recorded investment 2,027 5,037
Interest income recognized:    
With no related allowance recorded 0 0
With an allowance recorded 0 0
Interest income recognized 0 0
Home equity line of credit    
Recorded investment:    
With no related allowance recorded 913 707
With an allowance recorded 2,907 2,518
Recorded investment 3,820 3,225
Unpaid principal balance:    
With no related allowance recorded 1,159 948
With an allowance recorded 2,977 2,579
Unpaid principal balance 4,136 3,527
Related Allowance 629 442
Average recorded investment:    
With no related allowance recorded 849 400
With an allowance recorded 2,944 626
Average recorded investment 3,793 1,026
Interest income recognized:    
With no related allowance recorded 0 1
With an allowance recorded 27 6
Interest income recognized 27 7
Residential land    
Recorded investment:    
With no related allowance recorded 1,489 1,644
With an allowance recorded 2,988 4,039
Recorded investment 4,477 5,683
Unpaid principal balance:    
With no related allowance recorded 2,185 2,412
With an allowance recorded 2,988 4,117
Unpaid principal balance 5,173 6,529
Related Allowance 841 891
Average recorded investment:    
With no related allowance recorded 1,590 2,637
With an allowance recorded 3,378 5,189
Average recorded investment 4,968 7,826
Interest income recognized:    
With no related allowance recorded 16 52
With an allowance recorded 67 83
Interest income recognized 83 135
Commercial loans    
Recorded investment:    
With no related allowance recorded 5,079 5,671
With an allowance recorded 21,020 15,448
Recorded investment 26,099 21,119
Unpaid principal balance:    
With no related allowance recorded 5,831 6,333
With an allowance recorded 21,714 16,073
Unpaid principal balance 27,545 22,406
Related Allowance 3,643 3,527
Average recorded investment:    
With no related allowance recorded 4,999 7,295
With an allowance recorded 16,970 4,982
Average recorded investment 21,969 12,277
Interest income recognized:    
With no related allowance recorded 6 2
With an allowance recorded 30 50
Interest income recognized 36 52
Consumer loans    
Recorded investment:    
With no related allowance recorded   0
With an allowance recorded 13 13
Recorded investment 13 13
Unpaid principal balance:    
With no related allowance recorded   0
With an allowance recorded 13 13
Unpaid principal balance 13 13
Related Allowance 7 7
Average recorded investment:    
With no related allowance recorded   0
With an allowance recorded 13 15
Average recorded investment 13 15
Interest income recognized:    
With an allowance recorded $ 0 $ 0