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Bank segment - Credit risk profile - assigned grades (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Commercial real estate    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross $ 774,349 $ 690,561
Commercial real estate | Pass    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 681,712 642,410
Commercial real estate | Special mention    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 58,411 7,710
Commercial real estate | Substandard    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 34,226 40,441
Commercial real estate | Doubtful    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 0 0
Commercial real estate | Loss    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 0 0
Commercial construction    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 140,758 100,796
Commercial construction | Pass    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 114,325 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 26,433 0
Commercial construction | Doubtful    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 0 0
Commercial construction | Loss    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 0 0
Commercial loans    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 717,450 758,659
Commercial loans | Pass    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 643,547 703,208
Commercial loans | Special mention    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 17,654 7,029
Commercial loans | Substandard    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 54,156 47,975
Commercial loans | Doubtful    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 2,093 447
Commercial loans | Loss    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross $ 0 $ 0