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Loans and Allowance for Loan Losses - Industry Classification System (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | $ 5,969,494 |
Unfunded Commitments | 2,266,833 |
Total exposure | 8,236,327 | $ 7,437,746
Lessors of Nonresidential Buildings |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | 3,681,897 |
Unfunded Commitments | 896,219 |
Total exposure | 4,578,116 | 3,932,059
Lessors of Residential Buildings and Dwellings [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | 951,295 |
Unfunded Commitments | 648,542 |
Total exposure | 1,599,837 | 1,484,697
New housing for-sale builders |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | 530,345 |
Unfunded Commitments | 560,258 |
Total exposure | 1,090,603 | 1,100,989
Hotels and motels |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | 805,957 |
Unfunded Commitments | 161,814 |
Total exposure | $ 967,771 | $ 920,001

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X
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