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Significant Accounting Policies and Basis of Presentation - Narrative (Detail)
$ in Thousands
 12 Months Ended
Jan. 01, 2020
USD ($)
Dec. 31, 2021
USD ($)
Swap
position
contract
Dec. 31, 2020
USD ($)
contract
Swap
position
Dec. 31, 2019
USD ($)
Dec. 31, 2014
Nov. 30, 2020
USD ($)
position
Dec. 31, 2018
USD ($)
Derivative [Line Items]              
Average reserve balances required to be maintained with federal reserve bank   $ 0 $ 0        
Available-for-sale debt securities, accrued interest   11,000 4,200        
Proceeds from Sale of Debt Securities, Available-for-sale   689,856 387,810 $ 97,555      
Shareholders' equity   $ 1,366,217 1,117,086 1,052,795     $ 956,816
Contractual payment of principal duration (days)   90 days          
Contractual terms for loans (months)   6 months          
Maximum loan to value ratio   80.00%          
Threshold period past due, writeoff   120 days          
Goodwill and other intangibles   $ 3,736 3,969        
FHLB, Federal Reserve Bank, and other restricted stock   64,584 71,368        
Federal Home Loan Bank stock   $ 35,800 46,100        
Percentage of tax position that will be realized or sustained upon examination   50.00%          
Cumulative effect of change in accounting principle $ 136,200 $ 137,804 144,176 56,379      
Allowance for credit losses on lending-related commitments   $ 2,100 2,300        
Interest-only GNMA securities              
Derivative [Line Items]              
Proceeds from Sale of Debt Securities, Available-for-sale     15,400        
Debt securities, realized gain     $ 1,000        
Accounting Standards Update 2016-13              
Derivative [Line Items]              
Initial allowance on loans purchased with credit deterioration 200            
Financing receivable, purchased with credit deterioration, discount 300            
Interest rate swaps | Not Designated as Hedging Instrument              
Derivative [Line Items]              
Number of interest rate swaps | Swap   153 155        
Derivative notional amount   $ 1,400,000 $ 1,400,000        
Interest rate swaps | Cash Flow Hedging | Designated as Hedging Instrument              
Derivative [Line Items]              
Number of interest rate swaps | contract   0 5        
Derivative notional amount   $ 850,000 $ 1,100,000        
Interest rate swaps | Fair Value Hedging | Designated as Hedging Instrument              
Derivative [Line Items]              
Number of interest rate swaps | position   16 24     24  
Derivative notional amount   $ 80,500 $ 272,300     $ 272,300  
Credit contracts | Not Designated as Hedging Instrument              
Derivative [Line Items]              
Derivative notional amount   $ 129,900 177,200        
ESPP              
Derivative [Line Items]              
Purchase price under employee stock purchase plan (percent)   85.00%     85.00%    
Purchase price under employee stock purchase plan, discount (percent)   15.00%     15.00%    
Retained Earnings              
Derivative [Line Items]              
Shareholders' equity   $ 705,732 $ 438,581 381,519     $ 316,651
Cumulative Effect, Period of Adoption, Adjustment              
Derivative [Line Items]              
Shareholders' equity       (61,475)      
Net deferred tax (asset) liability (21,500)            
Cumulative effect of change in accounting principle 79,800     79,829      
Allowance for credit losses on lending-related commitments 3,400            
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings              
Derivative [Line Items]              
Shareholders' equity $ (61,500)     $ (61,475)