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Derivative Instruments and Hedging Activities - Fair Value of Derivative Financial Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Other Assets | Derivative Designated as Hedging Instrument | Cash Flow Hedges    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets $ 0 $ 196
Other Assets | Derivative Designated as Hedging Instrument | Fair Value Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets 976 0
Other Assets | Derivative Designated as Hedging Instrument | Interest Rate Swap | Cash Flow Hedges    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets 0 196
Other Assets | Derivative Designated as Hedging Instrument | Interest Rate Swap | Fair Value Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets 976 0
Other Assets | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets 35,526 54,027
Other Assets | Not Designated as Hedging Instrument | Residential mortgage loan commitments    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets 196 200
Other Assets | Not Designated as Hedging Instrument | Interest Rate Swap    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets 34,962 53,455
Other Assets | Not Designated as Hedging Instrument | Interest Rate Cap    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets 166 46
Other Assets | Not Designated as Hedging Instrument | Credit Contract    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets 202 326
Other Liabilities | Derivative Designated as Hedging Instrument | Cash Flow Hedges    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Liabilities 1,034 40,765
Other Liabilities | Derivative Designated as Hedging Instrument | Fair Value Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Liabilities 0 741
Other Liabilities | Derivative Designated as Hedging Instrument | Interest Rate Swap | Cash Flow Hedges    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Liabilities 1,034 40,765
Other Liabilities | Derivative Designated as Hedging Instrument | Interest Rate Swap | Fair Value Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Liabilities 0 741
Other Liabilities | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Liabilities 36,502 56,658
Other Liabilities | Not Designated as Hedging Instrument | Residential mortgage loan commitments    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Liabilities 0 0
Other Liabilities | Not Designated as Hedging Instrument | Interest Rate Swap    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Liabilities 36,154 56,209
Other Liabilities | Not Designated as Hedging Instrument | Interest Rate Cap    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Liabilities 166 46
Other Liabilities | Not Designated as Hedging Instrument | Credit Contract    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Liabilities $ 182 $ 403