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Bank segment - Credit risk profile - assigned grades (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross | $ 5,180,378 | $ 5,120,664
Commercial Portfolio Segment |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 1,566,109
Commercial Portfolio Segment | Pass |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 1,446,720
Commercial Portfolio Segment | Special Mention |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 34,372
Commercial Portfolio Segment | Substandard |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 85,017
Commercial Portfolio Segment | Doubtful |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 0
Commercial Portfolio Segment | Loss |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 0
Commercial real estate |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross | 852,120 | 824,830
Commercial real estate | Pass |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 756,747
Commercial real estate | Special Mention |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 4,451
Commercial real estate | Substandard |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 63,632
Commercial real estate | Doubtful |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 0
Commercial real estate | Loss |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 0
Commercial construction |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross | 79,377 | 70,605
Commercial construction | Pass |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 68,316
Commercial construction | Special Mention |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 0
Commercial construction | Substandard |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 2,289
Commercial construction | Doubtful |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 0
Commercial construction | Loss |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 0
Commercial loans |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross | $ 722,647 | 670,674
Commercial loans | Pass |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 621,657
Commercial loans | Special Mention |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 29,921
Commercial loans | Substandard |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 19,096
Commercial loans | Doubtful |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 0
Commercial loans | Loss |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | $ 0

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