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Fair Value Measurements - Summary of Changes in Level 3 Fair Value Category (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Interest Rate Swap [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability $ 87,000   $ 87,000     $ 67,000    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings     23,000          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss     0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases     0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues     0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales     0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements     (3,000)          
Interest Rate Swap [Member] | Interest Rate Swap [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 87,000 $ 63,000 87,000 $ 63,000 $ 79,000   $ 54,000  
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) 10,000 10,000            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 10,000 10,000            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss 0 0            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases 0 0            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues 0 0            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales 0 0            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements (2,000) (1,000)            
Credit Derivative [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability (1,000)   (1,000)     0    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings     (1,000)          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss     0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases     0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues     0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales     0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements     0          
Credit Derivative [Member] | Credit Derivative [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability (1,000) (1,000) (1,000) (1,000) (2,000)   (1,000)  
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) 1,000 0            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 1,000 0            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss 0 0            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases 0 0            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues 0 0            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales 0 0            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements 0 0            
Derivative [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 86,000 62,000 86,000 62,000 77,000 66,000 53,000 $ 46,000
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) 10,000 10,000            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 11,000 10,000 23,000 19,000        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss 0 0 0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases 0 0 0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues 0 0 0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales 0 0 0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements (2,000) (1,000) (3,000) 2,000        
Derivative [Member] | Credit Derivative [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability   (1,000)   (1,000)       (1,000)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings       1,000        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss       0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases       0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues       0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales       0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements       0        
Derivative [Member] | Interest Rate Swap [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability   63,000   63,000       47,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings       18,000        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss       0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases       0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues       0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales       0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements       (2,000)        
Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 5,848,000 7,080,000 5,848,000 7,080,000 5,884,000 6,207,000 7,139,000 6,930,000
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) 71,000 193,000            
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI (22,000)   (398,000)          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 72,000 193,000 201,000 353,000        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss (22,000) (163,000) (398,000) (28,000)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements (86,000) (89,000) (162,000) (176,000)        
Level 3 [Member] | Investment Contracts [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability   2,882,000   2,882,000        
Level 3 [Member] | Loans [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability   4,289,000   4,289,000        
Level 3 [Member] | Long-term Debt [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability   (231,000)   (231,000)        
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability               46,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings       19,000        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss       0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases       0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues       0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales       0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements       (2,000)        
Level 3 [Member] | Investments [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 66,000 74,000 66,000 74,000 66,000 72,000 72,000 72,000
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 0   (6,000)          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 0 0 1,000 1,000        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss 0 2,000 (6,000) 2,000        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements 0 0 (1,000) (1,000)        
Level 3 [Member] | Other Assets [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 2,000 4,000 2,000 4,000 3,000 3,000 4,000 $ 5,000
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0            
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 0   0          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 0 0 (1,000) (1,000)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales     0 0        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements     0 0        
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 86,000 62,000 86,000 62,000   $ 66,000    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings     23,000          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss     0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases     0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues     0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales     0          
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements     (3,000)          
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Derivative Financial Instruments, Liabilities [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 86,000 62,000 86,000 $ 62,000 $ 77,000   $ 53,000  
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) 10,000 10,000            
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 0   $ 0          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 11,000 10,000            
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements $ (2,000) $ (1,000)