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Derivative Instruments and Hedging Activities - Fair Value of Derivative Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Interest Rate Swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Gross Amounts Recognized on the Consolidated Balance Sheets $ 0 $ 432
Gross Amounts Recognized on the Consolidated Balance Sheets 110,039 45,727
Other Assets | Derivative Designated as Cash Flow Hedges | Interest Rate Swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Gross Amounts Recognized on the Consolidated Balance Sheets 0 0
Other Assets | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Gross Amounts Recognized on the Consolidated Balance Sheets 60,810 23,608
Other Assets | Not Designated as Hedging Instrument | Residential real estate    
Derivative Instruments, Gain (Loss) [Line Items]    
Gross Amounts Recognized on the Consolidated Balance Sheets 455 79
Other Assets | Not Designated as Hedging Instrument | Interest Rate Swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Gross Amounts Recognized on the Consolidated Balance Sheets 59,962 23,301
Other Assets | Not Designated as Hedging Instrument | Interest Rate Cap    
Derivative Instruments, Gain (Loss) [Line Items]    
Gross Amounts Recognized on the Consolidated Balance Sheets 9 9
Other Assets | Not Designated as Hedging Instrument | Credit Contract    
Derivative Instruments, Gain (Loss) [Line Items]    
Gross Amounts Recognized on the Consolidated Balance Sheets 384 219
Other Liabilities | Derivative Designated as Cash Flow Hedges | Interest Rate Swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Gross Amounts Recognized on the Consolidated Balance Sheets 46,785 21,374
Other Liabilities | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Gross Amounts Recognized on the Consolidated Balance Sheets 63,864 24,565
Other Liabilities | Not Designated as Hedging Instrument | Residential real estate    
Derivative Instruments, Gain (Loss) [Line Items]    
Gross Amounts Recognized on the Consolidated Balance Sheets 0 0
Other Liabilities | Not Designated as Hedging Instrument | Interest Rate Swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Gross Amounts Recognized on the Consolidated Balance Sheets 63,340 24,797
Other Liabilities | Not Designated as Hedging Instrument | Interest Rate Cap    
Derivative Instruments, Gain (Loss) [Line Items]    
Gross Amounts Recognized on the Consolidated Balance Sheets 9 9
Other Liabilities | Not Designated as Hedging Instrument | Credit Contract    
Derivative Instruments, Gain (Loss) [Line Items]    
Gross Amounts Recognized on the Consolidated Balance Sheets $ 515 $ (241)