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Derivative Instruments and Hedging Activities - Fair Value of Derivative Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Other Assets | Derivative Designated as Hedging Instrument | Cash Flow Hedges    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets   $ 196
Other Assets | Derivative Designated as Hedging Instrument | Fair Value Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets $ 846 0
Other Assets | Derivative Designated as Hedging Instrument | Interest Rate Swap | Cash Flow Hedges    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets   196
Other Assets | Derivative Designated as Hedging Instrument | Interest Rate Swap | Fair Value Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets 846 0
Other Assets | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets 37,443 54,027
Other Assets | Not Designated as Hedging Instrument | Residential mortgage loan commitments    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets 301 200
Other Assets | Not Designated as Hedging Instrument | Interest Rate Swap    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets 36,795 53,455
Other Assets | Not Designated as Hedging Instrument | Interest Rate Cap    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets 146 46
Other Assets | Not Designated as Hedging Instrument | Credit Contract    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Assets 201 326
Other Liabilities | Derivative Designated as Hedging Instrument | Cash Flow Hedges    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Liabilities   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   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 38,756 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 38,367 56,209
Other Liabilities | Not Designated as Hedging Instrument | Interest Rate Cap    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Liabilities 146 46
Other Liabilities | Not Designated as Hedging Instrument | Credit Contract    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Liabilities $ 243 $ 403