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Derivative Financial Instruments (Narrative) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative [Line Items]      
Weighted-average strike rate for outstanding interest rate caps 3.36%    
Approximate credit exposure related to swaps with bank customers $ 112,600    
Cash collateral on deposit with other financial institutions 74,000 $ 37,500  
Interest Rate Swaps With Upstream Financial Institution Counterparties [Member]      
Derivative [Line Items]      
Approximate credit exposure related to swaps with bank customers 16,900    
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  
Not Designated as Hedging Instrument [Member] | Put Option [Member] | Other Non-Interest Income [Member]      
Derivative [Line Items]      
Gains included in other income from the sale of put options $ 5,992 $ 750 $ 0