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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Derivative [Line Items]            
Weighted-average strike rate for outstanding interest rate caps       3.67%    
Approximate credit exposure related to swaps with bank customers $ 103,000     $ 103,000    
Cash collateral for borrowed securities deposited with other financial institutions 48,600     48,600    
Interest rate swaps with upstream financial institution counterparties [Member]            
Derivative [Line Items]            
Approximate credit exposure related to swaps with bank customers 19,200     19,200    
Not Designated as Hedging Instrument [Member] | Financial Institution Counterparties Loan Lease Interest Rate Swaps Liabilities [Member]            
Derivative [Line Items]            
Estimated fair value of derivative contracts cleared through Chicago Mercantile Exchange 0     0   $ 0
Notional Amount 1,192,762     1,192,762   $ 1,002,860
Other Income [Member] | Not Designated as Hedging Instrument [Member] | Put Option [Member]            
Derivative [Line Items]            
Amount of gain (loss) included in income $ 0 $ 6,000 $ 0 $ 5,980 $ 0  
US Treasury Securities [Member] | Not Designated as Hedging Instrument [Member] | Put Option [Member]            
Derivative [Line Items]            
Notional Amount   $ 500,000