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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Derivative [Line Items]      
Weighted-average strike rate for outstanding interest rate caps 3.29%    
Approximate credit exposure related to swaps with bank customers $ 122,100    
Cash collateral for borrowed securities deposited with other financial institutions 110,200    
Interest rate swaps with upstream financial institution counterparties [Member]      
Derivative [Line Items]      
Approximate credit exposure related to swaps with bank customers 24,800    
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
Other Income [Member] | Not Designated as Hedging Instrument [Member] | Put Option [Member]      
Derivative [Line Items]      
Amount of gain (loss) included in income $ 0 $ 5,980  
US Treasury Securities [Member] | Not Designated as Hedging Instrument [Member] | Put Option [Member]      
Derivative [Line Items]      
Notional Amount   $ 500,000