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Bank segment - Credit risk profile - assigned grades (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Commercial real estate    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross $ 703,661 $ 690,561
Commercial real estate | Pass    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 655,307 642,410
Commercial real estate | Special mention    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 16,096 7,710
Commercial real estate | Substandard    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 32,258 40,441
Commercial construction    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 130,487 100,796
Commercial construction | Pass    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 110,744 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 19,743 0
Commercial loans    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 740,596 758,659
Commercial loans | Pass    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 679,370 703,208
Commercial loans | Special mention    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 12,662 7,029
Commercial loans | Substandard    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross 48,302 47,975
Commercial loans | Doubtful    
Credit risk profile by internally assigned grade for loans    
Loans and leases receivable before fees, gross $ 262 $ 447