Loans and Allowance for Credit Losses - Industry Classification System (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Lessors of nonresidential buildings
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balances	$ 3,737,224
Unfunded Commitments	895,221
Total exposure	4,632,445	$ 4,578,116
Lessors of residential buildings
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balances	939,201
Unfunded Commitments	690,788
Total exposure	1,629,989	1,599,837
New Housing For-Sale Builders
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balances	534,896
Unfunded Commitments	599,323
Total exposure	1,134,219	1,090,603
Hotels (except Casino Hotels) and Motels
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balances	825,202
Unfunded Commitments	139,190
Total exposure	$ 964,392	$ 967,771