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Bank Loans (Tables) | 12 Months Ended
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Dec. 31, 2017
Receivables [Abstract] |
Schedule Of Balance And Associated Percentage Of Each Major Loan Category In Bank Loan Portfolio |
|  | December 31, 2017 |  |  | December 31, 2016 |
|  | Balance |  |  | Percent |  |  | Balance |  |  | Percent |
Residential real estate |  | $ | 2,593,576 |  |  |  | 37.0 | % |  | $ | 2,161,400 |  |  |  | 38.4 | %
Commercial and industrial |  |  | 2,437,938 |  |  |  | 34.8 |  |  |  | 1,710,399 |  |  |  | 30.3 |
Securities-based loans |  |  | 1,819,206 |  |  |  | 25.9 |  |  |  | 1,614,033 |  |  |  | 28.6 |
Commercial real estate |  |  | 116,258 |  |  |  | 1.7 |  |  |  | 78,711 |  |  |  | 1.4 |
Consumer |  |  | 24,508 |  |  |  | 0.3 |  |  |  | 45,391 |  |  |  | 0.8 |
Home equity lines of credit |  |  | 15,039 |  |  |  | 0.2 |  |  |  | 15,008 |  |  |  | 0.3 |
Construction and land |  |  | 7,896 |  |  |  | 0.1 |  |  |  | 12,623 |  |  |  | 0.2 |
Gross bank loans |  |  | 7,014,421 |  |  |  | 100.0 | % |  |  | 5,637,565 |  |  |  | 100.0 | %
Unamortized loan premium/(discount), net |  |  | 788 |  |  |  |  |  |  |  | 858 |  |  |  |  |
Loans in process |  |  | (856 | ) |  |  |  |  |  |  | (49 | ) |  |  |  |
Unamortized loan fees, net |  |  | 872 |  |  |  |  |  |  |  | (2,021 | ) |  |  |  |
Allowance for loan losses |  |  | (67,466 | ) |  |  |  |  |  |  | (45,163 | ) |  |  |  |
Bank loans, net |  | $ | 6,947,759 |  |  |  |  |  |  | $ | 5,591,190 |  |  |  |  |
Activity In The Allowance For Loan Losses By Portfolio Segment |
|  | Year Ended December 31, 2017 |
|  | Beginning Balance |  |  | Provision |  |  | Charge- offs |  |  | Recoveries |  |  | Ending Balance |
Commercial and industrial |  | $ | 35,127 |  |  | $ | 19,666 |  |  | $ | (355 | ) |  | $ | 36 |  |  | $ | 54,474 |
Securities-based loans |  |  | 3,094 |  |  |  | (1,006 | ) |  |  | — |  |  |  | — |  |  |  | 2,088 |
Residential real estate |  |  | 2,660 |  |  |  | 5,770 |  |  |  | — |  |  |  | — |  |  |  | 8,430 |
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 |
Consumer |  |  | 129 |  |  |  | (115 | ) |  |  | — |  |  |  | 2 |  |  |  | 16 |
Qualitative |  |  | 2,187 |  |  |  | (1,511 | ) |  |  | — |  |  |  | — |  |  |  | 676 |
|  | $ | 45,163 |  |  | $ | 25,320 |  |  | $ | (3,058 | ) |  | $ | 41 |  |  | $ | 67,466 |
|  | Year Ended December 31, 2016 |
|  | Beginning Balance |  |  | Provision |  |  | Charge- offs |  |  | Recoveries |  |  | Ending Balance |
Commercial and industrial |  | $ | 24,748 |  |  | $ | 10,646 |  |  | $ | (267 | ) |  | $ | — |  |  | $ | 35,127 |
Securities-based loans |  |  | 1,607 |  |  |  | 1,487 |  |  |  | — |  |  |  | — |  |  |  | 3,094 |
Residential real estate |  |  | 1,241 |  |  |  | 1,430 |  |  |  | (13 | ) |  |  | 2 |  |  |  | 2,660 |
Commercial real estate |  |  | 264 |  |  |  | 1,090 |  |  |  | — |  |  |  | 9 |  |  |  | 1,363 |
Home equity lines of credit |  |  | 290 |  |  |  | 81 |  |  |  | — |  |  |  | — |  |  |  | 371 |
Construction and land |  |  | 78 |  |  |  | 154 |  |  |  | — |  |  |  | — |  |  |  | 232 |
Consumer |  |  | 105 |  |  |  | 38 |  |  |  | (16 | ) |  |  | 2 |  |  |  | 129 |
Qualitative |  |  | 1,454 |  |  |  | 733 |  |  |  | — |  |  |  | — |  |  |  | 2,187 |
|  | $ | 29,787 |  |  | $ | 15,659 |  |  | $ | (296 | ) |  | $ | 13 |  |  | $ | 45,163 |
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 |
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 |
Consumer |  |  | 2 |  |  |  | 14 |  |  |  | 16 |  |  |  | 2 |  |  |  | 24,506 |  |  |  | 24,508 |
Home equity lines of credit |  |  | 20 |  |  |  | 142 |  |  |  | 162 |  |  |  | 184 |  |  |  | 14,855 |  |  |  | 15,039 |
Construction and land |  |  | — |  |  |  | 100 |  |  |  | 100 |  |  |  | — |  |  |  | 7,896 |  |  |  | 7,896 |
Qualitative |  |  | — |  |  |  | 676 |  |  |  | 676 |  |  |  | — |  |  |  | — |  |  |  | — |
|  | $ | 9,105 |  |  | $ | 58,361 |  |  | $ | 67,466 |  |  | $ | 29,213 |  |  | $ | 6,985,208 |  |  | $ | 7,014,421 |
|  | 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 |  |  | $ | 2,636 |  |  | $ | 2,660 |  |  | $ | 178 |  |  | $ | 2,161,222 |  |  | $ | 2,161,400 |
Commercial and industrial |  |  | 2,392 |  |  |  | 32,735 |  |  |  | 35,127 |  |  |  | 16,815 |  |  |  | 1,693,584 |  |  |  | 1,710,399 |
Securities-based loans |  | — |  |  |  | 3,094 |  |  |  | 3,094 |  |  | — |  |  |  | 1,614,033 |  |  |  | 1,614,033 |
Commercial real estate |  |  | 722 |  |  |  | 641 |  |  |  | 1,363 |  |  |  | 9,522 |  |  |  | 69,189 |  |  |  | 78,711 |
Consumer |  |  | 6 |  |  |  | 123 |  |  |  | 129 |  |  |  | 6 |  |  |  | 45,385 |  |  |  | 45,391 |
Home equity lines of credit |  |  | 231 |  |  |  | 140 |  |  |  | 371 |  |  |  | 413 |  |  |  | 14,595 |  |  |  | 15,008 |
Construction and land |  | — |  |  |  | 232 |  |  |  | 232 |  |  | — |  |  |  | 12,623 |  |  |  | 12,623 |
Qualitative |  | — |  |  |  | 2,187 |  |  |  | 2,187 |  |  | — |  |  | — |  |  |  | — |
|  | $ | 3,375 |  |  | $ | 41,788 |  |  | $ | 45,163 |  |  | $ | 26,934 |  |  | $ | 5,610,631 |  |  | $ | 5,637,565 |
Loans That Were Individually Evaluated For Impairment By Portfolio Segment |
|  | 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 |
Consumer |  |  | 677 |  |  |  | — |  |  |  | 2 |  |  |  | 2 |  |  |  | 2 |  |  |  | 5 |
Home equity lines of credit |  |  | 184 |  |  |  | — |  |  |  | 184 |  |  |  | 184 |  |  |  | 20 |  |  |  | 300 |
Residential real estate |  |  | 171 |  |  |  | — |  |  |  | 171 |  |  |  | 171 |  |  |  | 24 |  |  |  | 174 |
Total |  | $ | 29,888 |  |  | $ | 5,211 |  |  | $ | 24,002 |  |  | $ | 29,213 |  |  | $ | 9,105 |  |  | $ | 30,756 |
|  | December 31, 2016 |
|  | Unpaid Contractual Principal Balance |  |  | Recorded Investment with No Allowance |  |  | Recorded Investment with Allowance |  |  | Total Recorded Investment |  |  | Related Allowance |  |  | Average Recorded Investment |
Commercial and industrial |  | $ | 16,815 |  |  | $ | — |  |  | $ | 16,815 |  |  | $ | 16,815 |  |  | $ | 2,392 |  |  | $ | 22,559 |
Commercial real estate |  |  | 10,503 |  |  | — |  |  |  | 9,522 |  |  |  | 9,522 |  |  |  | 722 |  |  |  | 9,080 |
Consumer |  |  | 833 |  |  | — |  |  |  | 6 |  |  |  | 6 |  |  |  | 6 |  |  |  | 9 |
Home equity lines of credit |  |  | 413 |  |  | — |  |  |  | 413 |  |  |  | 413 |  |  |  | 231 |  |  |  | 413 |
Residential real estate |  |  | 178 |  |  | — |  |  |  | 178 |  |  |  | 178 |  |  |  | 24 |  |  |  | 181 |
Total |  | $ | 28,742 |  |  | $ | — |  |  | $ | 26,934 |  |  | $ | 26,934 |  |  | $ | 3,375 |  |  | $ | 32,242 |
Aging Of The Recorded Investment In Past Due Loans |
|  | 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 |
Consumer |  |  | 2 |  |  |  | — |  |  |  | 2 |  |  |  | 24,506 |  |  |  | 24,508 |
Home equity lines of credit |  |  | 184 |  |  |  | — |  |  |  | 184 |  |  |  | 14,855 |  |  |  | 15,039 |
Construction and land |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 7,896 |  |  |  | 7,896 |
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 |
Consumer |  |  | 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.
|  | December 31, 2016 |
|  | 30 – 89 Days Past Due |  |  | 90 or More Days Past Due |  |  | Total Past Due |  |  | Current Balance |  |  | Total |
Residential real estate |  | $ | 1,923 |  |  | $ | — |  |  | $ | 1,923 |  |  | $ | 2,159,477 |  |  |  | 2,161,400 |
Commercial and industrial |  | — |  |  | — |  |  |  | — |  |  |  | 1,710,399 |  |  |  | 1,710,399 |
Securities-based loans |  | — |  |  | — |  |  |  | — |  |  |  | 1,614,033 |  |  |  | 1,614,033 |
Commercial real estate |  |  | 9,522 |  |  | — |  |  |  | 9,522 |  |  |  | 69,189 |  |  |  | 78,711 |
Consumer |  | — |  |  |  | 2 |  |  |  | 2 |  |  |  | 45,389 |  |  |  | 45,391 |
Home equity lines of credit |  |  | 78 |  |  |  | 196 |  |  |  | 274 |  |  |  | 14,734 |  |  |  | 15,008 |
Construction and land |  | — |  |  | — |  |  |  | — |  |  |  | 12,623 |  |  |  | 12,623 |
Total |  | $ | 11,523 |  |  | $ | 198 |  |  | $ | 11,721 |  |  | $ | 5,625,844 |  |  | $ | 5,637,565 |
|  | December 31, 2016 * |
|  | Non-accrual |  |  | Restructured |  |  | Total |
Commercial and industrial |  | $ | 16,815 |  |  | $ | — |  |  | $ | 16,815 |
Commercial real estate |  |  | — |  |  |  | 9,522 |  |  |  | 9,522 |
Home equity lines of credit |  |  | 413 |  |  |  | — |  |  |  | 413 |
Residential real estate |  |  | — |  |  |  | 178 |  |  |  | 178 |
Consumer |  |  | 6 |  |  |  | — |  |  |  | 6 |
Total |  | $ | 17,234 |  |  | $ | 9,700 |  |  | $ | 26,934 |
* There were no loans past due 90 days and still accruing interest at December 31, 2016.
Risk Category Of Loan Portfolio |
|  | 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 |
Consumer |  |  | 24,506 |  |  |  | — |  |  |  | 2 |  |  |  | — |  |  |  | 24,508 |
Home equity lines of credit |  |  | 14,855 |  |  |  | — |  |  |  | 184 |  |  |  | — |  |  |  | 15,039 |
Construction and land |  |  | 7,896 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 7,896 |
Total |  | $ | 6,960,969 |  |  | $ | 22,752 |  |  | $ | 30,700 |  |  | $ | — |  |  | $ | 7,014,421 |
|  | December 31, 2016 |
|  | Pass |  |  | Special Mention |  |  | Substandard |  |  | Doubtful |  |  | Total |
Residential real estate |  | $ | 2,161,223 |  |  | $ | — |  |  | $ | 177 |  |  | $ | — |  |  |  | 2,161,400 |
Commercial and industrial |  |  | 1,652,211 |  |  |  | 27,905 |  |  |  | 30,283 |  |  | — |  |  |  | 1,710,399 |
Securities-based loans |  |  | 1,614,033 |  |  | — |  |  | — |  |  | — |  |  |  | 1,614,033 |
Commercial real estate |  |  | 69,189 |  |  | — |  |  |  | 9,522 |  |  | — |  |  |  | 78,711 |
Consumer |  |  | 45,385 |  |  | — |  |  |  | 6 |  |  | — |  |  |  | 45,391 |
Home equity lines of credit |  |  | 14,595 |  |  | — |  |  |  | 413 |  |  | — |  |  |  | 15,008 |
Construction and land |  |  | 12,623 |  |  | — |  |  | — |  |  | — |  |  |  | 12,623 |
Total |  | $ | 5,569,259 |  |  | $ | 27,905 |  |  | $ | 40,401 |  |  | $ | — |  |  | $ | 5,637,565 |

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