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Loans and Allowance for Loan Losses - Industry Classification System (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Lessors of nonresidential buildings |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | $ 3,096,519 |
Unfunded Commitments | 668,891 |
Total exposure | 3,765,410 | $ 3,483,597
Lessors of residential buildings |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | 981,328 |
Unfunded Commitments | 283,888 |
Total exposure | 1,265,216 | 1,151,676
Hotels (except for Casino Hotels) and Motels |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | 723,347 |
Unfunded Commitments | 167,577 |
Total exposure | 890,924 | 836,320
236117 New Housing Operative Builders [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | 374,653 |
Unfunded Commitments | 593,400 |
Total exposure | $ 968,053 | $ 780,137

X
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X
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