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Loans and Allowance for Loan Losses - Industry Classification System (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Lessors of nonresidential buildings
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balances	$ 3,208,737
Unfunded Commitments	894,936
Total exposure	4,103,673	$ 3,932,059
Lessors of residential buildings
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balances	1,038,462
Unfunded Commitments	335,860
Total exposure	1,374,322	1,484,697
Hotels (except for Casino Hotels) and Motels
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balances	825,627
Unfunded Commitments	137,885
Total exposure	963,512	920,001
236117 New Housing Operative Builders [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balances	509,750
Unfunded Commitments	586,983
Total exposure	$ 1,096,733	$ 1,100,989

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- Definition

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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