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Loans and Allowance for Credit Losses - Industry Classification System (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Lessors of nonresidential buildings |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | $ 3,694,063 |
Unfunded Commitments | 1,366,385 |
Total exposure | 5,060,448 | $ 4,442,712
Lessors of residential buildings |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | 1,377,334 |
Unfunded Commitments | 923,992 |
Total exposure | 2,301,326 | 2,126,246
Hotels (except Casino Hotels) and Motels |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | 936,734 |
Unfunded Commitments | 53,999 |
Total exposure | 990,733 | 1,039,259
New Housing For-Sale Builders |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | 542,968 |
Unfunded Commitments | 893,927 |
Total exposure | $ 1,436,895 | $ 1,124,302

X
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X
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