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Loans and Allowance for Loan Losses - Industry Classification System (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Lessors of nonresidential buildings
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balances	$ 3,096,519
Unfunded Commitments	668,891
Total exposure	3,765,410	$ 3,483,597
Lessors of residential buildings
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balances	981,328
Unfunded Commitments	283,888
Total exposure	1,265,216	1,151,676
Hotels (except for Casino Hotels) and Motels
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balances	723,347
Unfunded Commitments	167,577
Total exposure	890,924	836,320
236117 New Housing Operative Builders [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balances	374,653
Unfunded Commitments	593,400
Total exposure	$ 968,053	$ 780,137

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- Definition

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- Definition

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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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