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Loans and Allowance for Loan Losses - Industry Classification System (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Lessors of Nonresidential Buildings |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | $ 3,149,948 |
Unfunded Commitments | 782,111 |
Total exposure | 3,932,059 | $ 3,483,597
Lessors of Residential Buildings and Dwellings [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | 1,200,653 |
Unfunded Commitments | 284,044 |
Total exposure | 1,484,697 | 1,151,676
New housing for-sale builders |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | 511,484 |
Unfunded Commitments | 589,505 |
Total exposure | 1,100,989 | 780,137
Hotels and motels |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Principal Balances | 779,390 |
Unfunded Commitments | 140,611 |
Total exposure | $ 920,001 | $ 836,320

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X
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