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Bank Loans (Tables) | 12 Months Ended
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Dec. 31, 2018
Receivables [Abstract] |
Schedule Of Balance And Associated Percentage Of Each Major Loan Category In Bank Loan Portfolio |
|  | December 31, 2018 |  |  | December 31, 2017 |
|  | Balance |  |  | Percent |  |  | Balance |  |  | Percent |
Commercial and industrial |  | $ | 3,304,234 |  |  |  | 38.5 | % |  | $ | 2,437,938 |  |  |  | 34.8 | %
Residential real estate |  |  | 2,875,014 |  |  |  | 33.5 |  |  |  | 2,593,576 |  |  |  | 37.0 |
Securities-based loans |  |  | 1,786,966 |  |  |  | 20.8 |  |  |  | 1,819,206 |  |  |  | 25.9 |
Commercial real estate |  |  | 318,961 |  |  |  | 3.7 |  |  |  | 116,258 |  |  |  | 1.7 |
Construction and land |  |  | 138,245 |  |  |  | 1.6 |  |  |  | 7,896 |  |  |  | 0.1 |
Home equity lines of credit |  |  | 38,098 |  |  |  | 0.4 |  |  |  | 15,039 |  |  |  | 0.2 |
Other |  |  | 120,129 |  |  |  | 1.5 |  |  |  | 24,508 |  |  |  | 0.3 |
Gross bank loans |  |  | 8,581,647 |  |  |  | 100.0 | % |  |  | 7,014,421 |  |  |  | 100.0 | %
Unamortized loan premium/(discount), net |  |  | (12,155 | ) |  |  |  |  |  |  | 788 |  |  |  |  |
Loans in process |  |  | 27,984 |  |  |  |  |  |  |  | (856 | ) |  |  |  |
Unamortized loan fees, net |  |  | 5,972 |  |  |  |  |  |  |  | 872 |  |  |  |  |
Allowance for loan losses |  |  | (85,833 | ) |  |  |  |  |  |  | (67,466 | ) |  |  |  |
Bank loans, net |  | $ | 8,517,615 |  |  |  |  |  |  | $ | 6,947,759 |  |  |  |  |
Activity In The Allowance For Loan Losses By Portfolio Segment |
|  | Year Ended December 31, 2018 |
|  | Beginning Balance |  |  | Provision |  |  | Charge- offs |  |  | Recoveries |  |  | Ending Balance |
Commercial and industrial |  | $ | 54,474 |  |  | $ | 13,896 |  |  | $ | (12 | ) |  | $ | 9 |  |  | $ | 68,367 |
Residential real estate |  |  | 8,430 |  |  |  | 2,798 |  |  |  | — |  |  |  | — |  |  |  | 11,228 |
Securities-based loans |  |  | 2,088 |  |  |  | (110 | ) |  |  | — |  |  |  | — |  |  |  | 1,978 |
Commercial real estate |  |  | 1,520 |  |  |  | 258 |  |  |  | — |  |  |  | — |  |  |  | 1,778 |
Construction and land |  |  | 100 |  |  |  | 1,141 |  |  |  | — |  |  |  | — |  |  |  | 1,241 |
Home equity lines of credit |  |  | 162 |  |  |  | 145 |  |  |  | — |  |  |  | 3 |  |  |  | 310 |
Other |  |  | 16 |  |  |  | 71 |  |  |  | (2 | ) |  |  | 3 |  |  |  | 88 |
Qualitative |  |  | 676 |  |  |  | 167 |  |  |  | — |  |  |  | — |  |  |  | 843 |
|  | $ | 67,466 |  |  | $ | 18,366 |  |  | $ | (14 | ) |  | $ | 15 |  |  | $ | 85,833 |
|  | Year Ended December 31, 2017 |
|  | Beginning Balance |  |  | Provision |  |  | Charge- offs |  |  | Recoveries |  |  | Ending Balance |
Commercial and industrial |  | $ | 35,127 |  |  | $ | 19,666 |  |  | $ | (355 | ) |  | $ | 36 |  |  | $ | 54,474 |
Residential real estate |  |  | 2,660 |  |  |  | 5,770 |  |  |  | — |  |  |  | — |  |  |  | 8,430 |
Securities-based loans |  |  | 3,094 |  |  |  | (1,006 | ) |  |  | — |  |  |  | — |  |  |  | 2,088 |
Commercial real estate |  |  | 1,363 |  |  |  | 2,860 |  |  |  | (2,703 | ) |  |  | — |  |  |  | 1,520 |
Home equity lines of credit |  |  | 371 |  |  |  | (212 | ) |  |  | — |  |  |  | 3 |  |  |  | 162 |
Construction and land |  |  | 232 |  |  |  | (132 | ) |  |  | — |  |  |  | — |  |  |  | 100 |
Other |  |  | 129 |  |  |  | (115 | ) |  |  | — |  |  |  | 2 |  |  |  | 16 |
Qualitative |  |  | 2,187 |  |  |  | (1,511 | ) |  |  | — |  |  |  | — |  |  |  | 676 |
|  | $ | 45,163 |  |  | $ | 25,320 |  |  | $ | (3,058 | ) |  | $ | 41 |  |  | $ | 67,466 |
Unpaid Principal Balances Of Loans And Amount Of Allowance Allocated Based Upon Impairment Method By Portfolio Segment |
|  | Allowance for Loan Losses |  |  | Recorded Investment in Loans |
|  | Individually Evaluated for Impairment |  |  | Collectively Evaluated for Impairment |  |  | Total |  |  | Individually Evaluated for Impairment |  |  | Collectively Evaluated for Impairment |  |  | Total |
Commercial and industrial |  | $ | 8,678 |  |  | $ | 59,689 |  |  | $ | 68,367 |  |  | $ | 23,677 |  |  | $ | 3,280,557 |  |  | $ | 3,304,234 |
Residential real estate |  |  | 24 |  |  |  | 11,204 |  |  |  | 11,228 |  |  |  | 519 |  |  |  | 2,874,495 |  |  |  | 2,875,014 |
Securities-based loans |  |  | — |  |  |  | 1,978 |  |  |  | 1,978 |  |  |  | — |  |  |  | 1,786,966 |  |  |  | 1,786,966 |
Commercial real estate |  |  | — |  |  |  | 1,778 |  |  |  | 1,778 |  |  |  | — |  |  |  | 318,961 |  |  |  | 318,961 |
Construction and land |  |  | — |  |  |  | 1,241 |  |  |  | 1,241 |  |  |  | — |  |  |  | 138,245 |  |  |  | 138,245 |
Home equity lines of credit |  |  | — |  |  |  | 310 |  |  |  | 310 |  |  |  | 184 |  |  |  | 37,914 |  |  |  | 38,098 |
Other |  |  | 1 |  |  |  | 87 |  |  |  | 88 |  |  |  | 21 |  |  |  | 120,108 |  |  |  | 120,129 |
Qualitative |  |  | — |  |  |  | 843 |  |  |  | 843 |  |  |  | — |  |  |  | — |  |  |  | — |
|  | $ | 8,703 |  |  | $ | 77,130 |  |  | $ | 85,833 |  |  | $ | 24,401 |  |  | $ | 8,557,246 |  |  | $ | 8,581,647 |
|  | Allowance for Loan Losses |  |  | Recorded Investment in Loans |
|  | Individually Evaluated for Impairment |  |  | Collectively Evaluated for Impairment |  |  | Total |  |  | Individually Evaluated for Impairment |  |  | Collectively Evaluated for Impairment |  |  | Total |
Residential real estate |  | $ | 24 |  |  | $ | 8,406 |  |  | $ | 8,430 |  |  | $ | 171 |  |  | $ | 2,593,405 |  |  | $ | 2,593,576 |
Commercial and industrial |  |  | 9,059 |  |  |  | 45,415 |  |  |  | 54,474 |  |  |  | 28,856 |  |  |  | 2,409,082 |  |  |  | 2,437,938 |
Securities-based loans |  |  | — |  |  |  | 2,088 |  |  |  | 2,088 |  |  |  | — |  |  |  | 1,819,206 |  |  |  | 1,819,206 |
Commercial real estate |  |  | — |  |  |  | 1,520 |  |  |  | 1,520 |  |  |  | — |  |  |  | 116,258 |  |  |  | 116,258 |
Home equity lines of credit |  |  | 20 |  |  |  | 142 |  |  |  | 162 |  |  |  | 184 |  |  |  | 14,855 |  |  |  | 15,039 |
Construction and land |  |  | — |  |  |  | 100 |  |  |  | 100 |  |  |  | — |  |  |  | 7,896 |  |  |  | 7,896 |
Other |  |  | 2 |  |  |  | 14 |  |  |  | 16 |  |  |  | 2 |  |  |  | 24,506 |  |  |  | 24,508 |
Qualitative |  |  | — |  |  |  | 676 |  |  |  | 676 |  |  |  | — |  |  |  | — |  |  |  | — |
|  | $ | 9,105 |  |  | $ | 58,361 |  |  | $ | 67,466 |  |  | $ | 29,213 |  |  | $ | 6,985,208 |  |  | $ | 7,014,421 |
Loans That Were Individually Evaluated For Impairment By Portfolio Segment |
|  | December 31, 2018 |
|  | Unpaid Contractual Principal Balance |  |  | Recorded Investment with No Allowance |  |  | Recorded Investment with Allowance |  |  | Total Recorded Investment |  |  | Related Allowance |  |  | Average Recorded Investment |
Commercial and industrial |  | $ | 23,677 |  |  | $ | 242 |  |  | $ | 23,435 |  |  | $ | 23,677 |  |  | $ | 8,678 |  |  | $ | 23,807 |
Residential real estate |  |  | 544 |  |  |  | 352 |  |  |  | 167 |  |  |  | 519 |  |  |  | 24 |  |  |  | 275 |
Home equity lines of credit |  |  | 184 |  |  |  | 184 |  |  |  | — |  |  |  | 184 |  |  |  | — |  |  |  | 184 |
Other |  |  | 694 |  |  |  | 11 |  |  |  | 10 |  |  |  | 21 |  |  |  | 1 |  |  |  | 70 |
Total |  | $ | 25,099 |  |  | $ | 789 |  |  | $ | 23,612 |  |  | $ | 24,401 |  |  | $ | 8,703 |  |  | $ | 24,336 |
|  | December 31, 2017 |
|  | Unpaid Contractual Principal Balance |  |  | Recorded Investment with No Allowance |  |  | Recorded Investment with Allowance |  |  | Total Recorded Investment |  |  | Related Allowance |  |  | Average Recorded Investment |
Commercial and industrial |  | $ | 28,856 |  |  | $ | 5,211 |  |  | $ | 23,645 |  |  | $ | 28,856 |  |  | $ | 9,059 |  |  | $ | 30,277 |
Home equity lines of credit |  |  | 184 |  |  | — |  |  |  | 184 |  |  |  | 184 |  |  |  | 20 |  |  |  | 300 |
Residential real estate |  |  | 171 |  |  | — |  |  |  | 171 |  |  |  | 171 |  |  |  | 24 |  |  |  | 174 |
Other |  |  | 677 |  |  | — |  |  |  | 2 |  |  |  | 2 |  |  |  | 2 |  |  |  | 5 |
Total |  | $ | 29,888 |  |  | $ | 5,211 |  |  | $ | 24,002 |  |  | $ | 29,213 |  |  | $ | 9,105 |  |  | $ | 30,756 |
Aging Of The Recorded Investment In Past Due Loans |
|  | December 31, 2018 |
|  | 30-89 Days Past Due |  |  | 90 or More Days Past Due |  |  | Total Past Due |  |  | Current Balance |  |  | Total |
Commercial and industrial |  | $ | — |  |  | $ | 14,656 |  |  | $ | 14,656 |  |  | $ | 3,289,578 |  |  |  | 3,304,234 |
Residential real estate |  |  | 6,970 |  |  |  | 377 |  |  |  | 7,347 |  |  |  | 2,867,667 |  |  |  | 2,875,014 |
Securities-based loans |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,786,966 |  |  |  | 1,786,966 |
Commercial real estate |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 318,961 |  |  |  | 318,961 |
Construction and land |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 138,245 |  |  |  | 138,245 |
Home equity lines of credit |  |  | 33 |  |  |  | — |  |  |  | 33 |  |  |  | 38,065 |  |  |  | 38,098 |
Other |  |  | — |  |  |  | 134 |  |  |  | 134 |  |  |  | 119,995 |  |  |  | 120,129 |
Total |  | $ | 7,003 |  |  | $ | 15,167 |  |  | $ | 22,170 |  |  | $ | 8,559,477 |  |  | $ | 8,581,647 |
|  | December 31, 2018 * |
|  | Non-accrual |  |  | Restructured |  |  | Total |
Commercial and industrial |  | $ | 14,741 |  |  | $ | 8,936 |  |  | $ | 23,677 |
Residential real estate |  |  | 352 |  |  |  | 167 |  |  |  | 519 |
Home equity lines of credit |  |  | 184 |  |  |  | — |  |  |  | 184 |
Other |  |  | 21 |  |  |  | — |  |  |  | 21 |
Total |  | $ | 15,298 |  |  | $ | 9,103 |  |  | $ | 24,401 |
* There were no loans past due 90 days and still accruing interest at December 31, 2018.
|  | December 31, 2017 |
|  | 30 – 89 Days Past Due |  |  | 90 or More Days Past Due |  |  | Total Past Due |  |  | Current Balance |  |  | Total |
Residential real estate |  | $ | 7,892 |  |  | $ | — |  |  | $ | 7,892 |  |  | $ | 2,585,684 |  |  |  | 2,593,576 |
Commercial and industrial |  |  | 11,883 |  |  |  | — |  |  |  | 11,883 |  |  |  | 2,426,055 |  |  |  | 2,437,938 |
Securities-based loans |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,819,206 |  |  |  | 1,819,206 |
Commercial real estate |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 116,258 |  |  |  | 116,258 |
Home equity lines of credit |  |  | 184 |  |  |  | — |  |  |  | 184 |  |  |  | 14,855 |  |  |  | 15,039 |
Construction and land |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 7,896 |  |  |  | 7,896 |
Other |  |  | 2 |  |  |  | — |  |  |  | 2 |  |  |  | 24,506 |  |  |  | 24,508 |
Total |  | $ | 19,961 |  |  | $ | — |  |  | $ | 19,961 |  |  | $ | 6,994,460 |  |  | $ | 7,014,421 |
|  | December 31, 2017 * |
|  | Non-accrual |  |  | Restructured |  |  | Total |
Commercial and industrial |  | $ | 19,904 |  |  | $ | 8,952 |  |  | $ | 28,856 |
Home equity lines of credit |  |  | 184 |  |  |  | — |  |  |  | 184 |
Residential real estate |  |  | — |  |  |  | 171 |  |  |  | 171 |
Other |  |  | 2 |  |  |  | — |  |  |  | 2 |
Total |  | $ | 20,090 |  |  | $ | 9,123 |  |  | $ | 29,213 |
* There were no loans past due 90 days and still accruing interest at December 31, 2017.
Risk Category Of Loan Portfolio |
|  | December 31, 2018 |
|  | Pass |  |  | Special Mention |  |  | Substandard |  |  | Doubtful |  |  | Total |
Commercial and industrial |  | $ | 3,254,698 |  |  | $ | 34,795 |  |  | $ | 14,741 |  |  | $ | — |  |  | $ | 3,304,234 |
Residential real estate |  |  | 2,874,495 |  |  |  | — |  |  |  | 519 |  |  |  | — |  |  |  | 2,875,014 |
Securities-based loans |  |  | 1,786,966 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,786,966 |
Commercial real estate |  |  | 318,961 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 318,961 |
Construction and land |  |  | 138,245 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 138,245 |
Home equity lines of credit |  |  | 37,914 |  |  |  | — |  |  |  | 184 |  |  |  | — |  |  |  | 38,098 |
Other |  |  | 119,912 |  |  |  | 196 |  |  |  | — |  |  |  | 21 |  |  |  | 120,129 |
Total |  | $ | 8,531,191 |  |  | $ | 34,991 |  |  | $ | 15,444 |  |  | $ | 21 |  |  | $ | 8,581,647 |
|  | December 31, 2017 |
|  | Pass |  |  | Special Mention |  |  | Substandard |  |  | Doubtful |  |  | Total |
Residential real estate |  | $ | 2,593,096 |  |  | $ | 309 |  |  | $ | 171 |  |  | $ | — |  |  |  | 2,593,576 |
Commercial and industrial |  |  | 2,385,152 |  |  |  | 22,443 |  |  |  | 30,343 |  |  |  | — |  |  |  | 2,437,938 |
Securities-based loans |  |  | 1,819,206 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,819,206 |
Commercial real estate |  |  | 116,258 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 116,258 |
Home equity lines of credit |  |  | 14,855 |  |  |  | — |  |  |  | 184 |  |  |  | — |  |  |  | 15,039 |
Construction and land |  |  | 7,896 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 7,896 |
Other |  |  | 24,506 |  |  |  | — |  |  |  | 2 |  |  |  | — |  |  |  | 24,508 |
Total |  | $ | 6,960,969 |  |  | $ | 22,752 |  |  | $ | 30,700 |  |  | $ | — |  |  | $ | 7,014,421 |

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