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Loans and Allowance for Credit Losses - Industry Classification System (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Lessors of nonresidential buildings |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | $ 3,553,989 |
Unfunded Commitments | 1,053,464 |
Total exposure | 4,607,453 | $ 4,442,712
Lessors of residential buildings |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | 1,348,050 |
Unfunded Commitments | 814,962 |
Total exposure | 2,163,012 | 2,126,246
Hotels (except Casino Hotels) and Motels |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | 988,712 |
Unfunded Commitments | 71,837 |
Total exposure | 1,060,549 | 1,039,259
New Housing For-Sale Builders |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | 489,417 |
Unfunded Commitments | 747,732 |
Total exposure | $ 1,237,149 | $ 1,124,302

X
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X
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