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Investment Securities (Securities Available for Sale) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Amortized cost $ 1,997,185 $ 2,058,485
Gross unrealized gains 764 537
Gross unrealized losses (248,060) (255,474)
Available for sale debt securities, at fair value 1,749,889 1,803,548
U.S. Treasury obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost 276,106 275,620
Gross unrealized gains 0 0
Gross unrealized losses (29,039) (29,804)
Available for sale debt securities, at fair value 247,067 245,816
Agency obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost 31,452  
Gross unrealized gains 301  
Gross unrealized losses 0  
Available for sale debt securities, at fair value 31,753  
Mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost 1,549,842 1,636,913
Gross unrealized gains 84 209
Gross unrealized losses (203,202) (209,983)
Available for sale debt securities, at fair value 1,346,724 1,427,139
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost 34,351 37,706
Gross unrealized gains 379 278
Gross unrealized losses (224) (363)
Available for sale debt securities, at fair value 34,506 37,621
State and municipal obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost 64,939 67,706
Gross unrealized gains 0 0
Gross unrealized losses (9,214) (10,842)
Available for sale debt securities, at fair value 55,725 56,864
Corporate obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost 40,495 40,540
Gross unrealized gains 0 50
Gross unrealized losses (6,381) (4,482)
Available for sale debt securities, at fair value $ 34,114 $ 36,108