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Bank segment - Credit risk profile - assigned grades (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross | $ 5,389,443 | $ 5,067,821
Real estate | Commercial real estate |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 824,830
Real estate | Commercial construction |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 70,605
Commercial |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 670,674
Commercial Real Estate, Commercial Construction And Commercial Portfolio Segment |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 1,566,109
Pass | Real estate | Commercial real estate |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 756,747
Pass | Real estate | Commercial construction |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 68,316
Pass | Commercial |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 621,657
Pass | Commercial Real Estate, Commercial Construction And Commercial Portfolio Segment |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 1,446,720
Special Mention | Real estate | Commercial real estate |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 4,451
Special Mention | Real estate | Commercial construction |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 0
Special Mention | Commercial |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 29,921
Special Mention | Commercial Real Estate, Commercial Construction And Commercial Portfolio Segment |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 34,372
Substandard | Real estate | Commercial real estate |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 63,632
Substandard | Real estate | Commercial construction |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 2,289
Substandard | Commercial |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 19,096
Substandard | Commercial Real Estate, Commercial Construction And Commercial Portfolio Segment |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 85,017
Doubtful | Real estate | Commercial real estate |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 0
Doubtful | Real estate | Commercial construction |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 0
Doubtful | Commercial |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 0
Doubtful | Commercial Real Estate, Commercial Construction And Commercial Portfolio Segment |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 0
Loss | Real estate | Commercial real estate |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 0
Loss | Real estate | Commercial construction |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 0
Loss | Commercial |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | 0
Loss | Commercial Real Estate, Commercial Construction And Commercial Portfolio Segment |  |
Credit risk profile by internally assigned grade for loans |  |
Loans and leases receivable before fees, gross |  | $ 0

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