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Loans and Allowance for Loan Losses - Industry Classification System (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balances	$ 6,562,456
Unfunded Commitments	3,827,679
Total exposure	10,390,135	$ 8,732,519
Lessors of Nonresidential Buildings
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balances	3,779,463
Unfunded Commitments	1,589,175
Total exposure	5,368,638	4,442,712
Lessors of Residential Buildings and Dwellings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balances	1,361,389
Unfunded Commitments	1,204,963
Total exposure	2,566,352	2,126,246
New housing for-sale builders
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balances	555,069
Unfunded Commitments	979,720
Total exposure	1,534,789	1,124,302
Hotels and motels
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balances	866,535
Unfunded Commitments	53,821
Total exposure	$ 920,356	$ 1,039,259

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