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Bank segment - Credit risk profile - assigned grades (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Commercial real estate    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross $ 740,322 $ 690,561
Commercial real estate | Pass    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 664,731 642,410
Commercial real estate | Special mention    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 43,607 7,710
Commercial real estate | Substandard    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 31,984 40,441
Commercial construction    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 134,642 100,796
Commercial construction | Pass    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 107,552 86,991
Commercial construction | Special mention    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 0 13,805
Commercial construction | Substandard    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 27,090 0
Commercial loans    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 772,565 758,659
Commercial loans | Pass    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 712,020 703,208
Commercial loans | Special mention    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 12,607 7,029
Commercial loans | Substandard    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 47,698 47,975
Commercial loans | Doubtful    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross $ 240 $ 447