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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

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- Definition

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