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Loans and Allowance for Loan Losses - Industry Classification System (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Lessors of nonresidential buildings |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | $ 2,879,195 |
Unfunded Commitments | 691,591 |
Total exposure | 3,570,786 | $ 2,810,951
Lessors of residential buildings |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | 929,097 |
Unfunded Commitments | 275,564 |
Total exposure | 1,204,661 | 884,244
Hotels (except for Casino Hotels) and Motels |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | 678,619 |
Unfunded Commitments | 195,623 |
Total exposure | $ 874,242 | $ 628,991

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- Definition Represents the amount of financing receivables exposure to credit risk. + References No definition available. + Details
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X
- Definition Represents the amount of financing receivables principal balance outstanding. + References No definition available. + Details
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