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Loans and Allowance for Loan Losses - Industry Classification System (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Lessors of nonresidential buildings |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | $ 3,208,737 |
Unfunded Commitments | 894,936 |
Total exposure | 4,103,673 | $ 3,932,059
Lessors of residential buildings |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | 1,038,462 |
Unfunded Commitments | 335,860 |
Total exposure | 1,374,322 | 1,484,697
Hotels (except for Casino Hotels) and Motels |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | 825,627 |
Unfunded Commitments | 137,885 |
Total exposure | 963,512 | 920,001
236117 New Housing Operative Builders [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | 509,750 |
Unfunded Commitments | 586,983 |
Total exposure | $ 1,096,733 | $ 1,100,989

X
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X
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