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Additional Information Regarding Methods used to Evaluate Loan Portfolio for Impairment (Detail) - Additional Information Loan Portfolio - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Individually evaluated for impairment | $ 57,105 | $ 52,169
Loans Receivable, Collectively evaluated for impairment | 40,741,335 | 40,081,692
Total loans, net | 40,798,440 | 40,133,861
Mortgage Receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Individually evaluated for impairment | 14,363 | 15,794
Loans Receivable, Collectively evaluated for impairment | 37,933,184 | 37,720,923
Total loans, net | 37,947,547 | 37,736,717
Other loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans Receivable, Individually evaluated for impairment | 42,742 | 36,375
Loans Receivable, Collectively evaluated for impairment | 2,808,151 | 2,360,769
Total loans, net | $ 2,850,893 | $ 2,397,144

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