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Bank segment - Allowance for loan losses (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
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period $ 52,326 $ 45,795 $ 50,038 $ 45,618  
Charge-offs (2,505) (1,814) (5,463) (2,961)  
Recoveries 757 559 1,237 1,269  
Provision 4,753 1,825 9,519 2,439  
Valuation allowance, balance at the end of the period 55,331 46,365 55,331 46,365  
Ending balance: individually evaluated for impairment 6,180   6,180   $ 6,320
Ending balance: collectively evaluated for impairment 49,151   49,151   43,718
Financing Receivables:          
Total financing receivables 4,760,057   4,760,057   4,622,068
Ending balance: individually evaluated for impairment 59,173   59,173   53,685
Ending balance: collectively evaluated for impairment 4,700,884   4,700,884   4,568,383
Residential 1-4 family          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 4,593 4,921 4,186 4,662  
Charge-offs (15) (58) (60) (214)  
Recoveries 35 55 52 67  
Provision (229) (627) 206 (224)  
Valuation allowance, balance at the end of the period 4,384 4,291 4,384 4,291  
Ending balance: individually evaluated for impairment 1,709   1,709   1,453
Ending balance: collectively evaluated for impairment 2,675   2,675   2,733
Financing Receivables:          
Total financing receivables 2,064,343   2,064,343   2,069,665
Ending balance: individually evaluated for impairment 22,279   22,279   22,457
Ending balance: collectively evaluated for impairment 2,042,064   2,042,064   2,047,208
Commercial real estate          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 11,806 11,228 11,342 8,954  
Provision 1,755 (808) 2,219 1,466  
Valuation allowance, balance at the end of the period 13,561 10,420 13,561 10,420  
Ending balance: individually evaluated for impairment 172   172   0
Ending balance: collectively evaluated for impairment 13,389   13,389   11,342
Financing Receivables:          
Total financing receivables 740,322   740,322   690,561
Ending balance: individually evaluated for impairment 3,630   3,630   1,188
Ending balance: collectively evaluated for impairment 736,692   736,692   689,373
Home equity line of credit          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 7,172 6,523 7,260 6,982  
Charge-offs 0 (17) 0 (20)  
Recoveries 16 8 31 39  
Provision 648 99 545 (388)  
Valuation allowance, balance at the end of the period 7,836 6,613 7,836 6,613  
Ending balance: individually evaluated for impairment 826   826   442
Ending balance: collectively evaluated for impairment 7,010   7,010   6,818
Financing Receivables:          
Total financing receivables 860,522   860,522   846,294
Ending balance: individually evaluated for impairment 4,646   4,646   3,225
Ending balance: collectively evaluated for impairment 855,876   855,876   843,069
Residential land          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 1,740 2,286 1,671 1,875  
Charge-offs 0 0 0 0  
Recoveries 16 136 119 185  
Provision (67) (319) (101) 43  
Valuation allowance, balance at the end of the period 1,689 2,103 1,689 2,103  
Ending balance: individually evaluated for impairment 819   819   891
Ending balance: collectively evaluated for impairment 870   870   780
Financing Receivables:          
Total financing receivables 18,447   18,447   18,229
Ending balance: individually evaluated for impairment 4,453   4,453   5,683
Ending balance: collectively evaluated for impairment 13,994   13,994   12,546
Commercial construction          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 6,164 2,837 4,461 5,471  
Provision 829 (262) 2,532 (2,896)  
Valuation allowance, balance at the end of the period 6,993 2,575 6,993 2,575  
Ending balance: collectively evaluated for impairment 6,993   6,993   4,461
Financing Receivables:          
Total financing receivables 134,642   134,642   100,796
Ending balance: collectively evaluated for impairment 134,642   134,642   100,796
Residential construction          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 12 21 13 28  
Provision 0 (3) (1) (10)  
Valuation allowance, balance at the end of the period 12 18 12 18  
Ending balance: collectively evaluated for impairment 12   12   13
Financing Receivables:          
Total financing receivables 16,004   16,004   14,089
Ending balance: collectively evaluated for impairment 16,004   16,004   14,089
Commercial loans          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 16,991 14,580 17,208 14,017  
Charge-offs (962) (756) (2,305) (802)  
Recoveries 425 106 560 447  
Provision 631 3,539 1,622 3,807  
Valuation allowance, balance at the end of the period 17,085 17,469 17,085 17,469  
Ending balance: individually evaluated for impairment 2,647   2,647   3,527
Ending balance: collectively evaluated for impairment 14,438   14,438   13,681
Financing Receivables:          
Total financing receivables 772,565   772,565   758,659
Ending balance: individually evaluated for impairment 24,153   24,153   21,119
Ending balance: collectively evaluated for impairment 748,412   748,412   737,540
Consumer loans          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 3,848 3,399 3,897 3,629  
Charge-offs (1,528) (983) (3,098) (1,925)  
Recoveries 265 254 475 531  
Provision 1,186 206 2,497 641  
Valuation allowance, balance at the end of the period 3,771 2,876 3,771 2,876  
Ending balance: individually evaluated for impairment 7   7   7
Ending balance: collectively evaluated for impairment 3,764   3,764   3,890
Financing Receivables:          
Total financing receivables 153,212   153,212   123,775
Ending balance: individually evaluated for impairment 12   12   13
Ending balance: collectively evaluated for impairment 153,200   153,200   123,762
Unallocated          
Allowance for loan losses:          
Valuation allowance, balance at the beginning of the period 0 0 0 0  
Provision 0 0 0 0  
Valuation allowance, balance at the end of the period 0 $ 0 0 $ 0  
Ending balance: collectively evaluated for impairment $ 0   $ 0   $ 0