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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Derivative [Line Items]      
Weighted-average strike rate for outstanding interest rate caps 2.86%    
Approximate credit exposure related to swaps with bank customers $ 96,800    
Cash collateral for borrowed securities deposited with other financial institutions 41,600    
Interest rate swaps with upstream financial institution counterparties [Member]      
Derivative [Line Items]      
Approximate credit exposure related to swaps with bank customers 22,600    
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
Notional Amount 1,191,926   $ 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 5,980 $ 0  
US Treasury Securities [Member] | Not Designated as Hedging Instrument [Member] | Put Option [Member]      
Derivative [Line Items]      
Notional Amount $ 500,000