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Investment Securities (Narrative) (Detail)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
security
position
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
security
position
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
security
position
Schedule of Held-to-maturity Securities [Line Items]          
Available for sale debt securities, at fair value $ 1,749,889,000   $ 1,749,889,000   $ 1,803,548,000
Held to maturity debt securities $ 378,894,000   $ 378,894,000   $ 387,923,000
Total number of all held to maturity and available for sale securities in an unrealized loss position | security 937   937   914
Investments which pay principal on periodic basis, amortized cost $ 1,620,000,000   $ 1,620,000,000    
Investments which pay principal on periodic basis, fair value 1,410,000,000   1,410,000,000    
Proceeds from sale of held-to-maturity securities 0 $ 0 0 $ 0  
Proceeds from calls on securities $ 0   $ 0    
Proceeds from sales of available for sale debt securities   5,400,000   5,400,000  
Gain recognized on sale of securities   58,000   58,000  
Loss recognized on sale of securities   0   0  
Securities available for sale, number of securities in an unrealized loss position | position 464   464   475
Held to maturity securities, proceeds from calls $ 3,500,000 10,300,000 $ 6,600,000 26,200,000  
Held to maturity securities, recognized gain on calls 28,000 83,000 24,000 99,000  
Held to maturity securities, recognized loss on calls $ 0 $ 0 $ 0 $ 0  
Number of securities in an unrealized loss position | security 473   473   439
AAA          
Schedule of Held-to-maturity Securities [Line Items]          
Amount of total portfolio     16.00%    
AA          
Schedule of Held-to-maturity Securities [Line Items]          
Amount of total portfolio     45.00%    
A          
Schedule of Held-to-maturity Securities [Line Items]          
Amount of total portfolio     39.00%    
A rated or not rated          
Schedule of Held-to-maturity Securities [Line Items]          
Amount of total portfolio     1.00%    
Mortgage-backed securities          
Schedule of Held-to-maturity Securities [Line Items]          
Available for sale debt securities, at fair value $ 1,346,724,000   $ 1,346,724,000   $ 1,427,139,000
Held-to-maturity, debt securities, allowance $ 25,000   $ 25,000   $ 27,000