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Bank Call Loans - Summary of Bank Call Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Bank Call Loans [Abstract] |  |
Year-end balance | $ 118,300 | $ 145,800
Weighted interest rate (at end of year) | 2.25% | 1.77%
Maximum balance (at any month-end) | $ 230,400 | $ 151,900
Bank Call Loans Average Amount Outstanding | $ 123,918 | $ 106,455
Average interest rate (during the year) | 2.08% | 1.52%

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- Definition Average interest rates. + References No definition available. + Details
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- Definition Bank Call Loans [Abstract] + References No definition available. + Details
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- Definition Bank Call Loans Average Amount Outstanding + References No definition available. + Details
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- Definition Bank loans maximum balance at any month end. + References No definition available. + Details
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- Definition Weighted average interest rate. + References No definition available. + Details
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- Definition Amounts due on short-term bank loans secured by customers' securities on the balance sheet date. + References No definition available. + Details
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