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Loans and Allowance for Loan Losses - Industry Classification System (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | $ 6,562,456 |
Unfunded Commitments | 3,827,679 |
Total exposure | 10,390,135 | $ 8,732,519
Lessors of Nonresidential Buildings |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | 3,779,463 |
Unfunded Commitments | 1,589,175 |
Total exposure | 5,368,638 | 4,442,712
Lessors of Residential Buildings and Dwellings [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | 1,361,389 |
Unfunded Commitments | 1,204,963 |
Total exposure | 2,566,352 | 2,126,246
New housing for-sale builders |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | 555,069 |
Unfunded Commitments | 979,720 |
Total exposure | 1,534,789 | 1,124,302
Hotels and motels |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | 866,535 |
Unfunded Commitments | 53,821 |
Total exposure | $ 920,356 | $ 1,039,259

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