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Securities - Schedule of Unrealized Losses on Investment Securities (Detail)
$ in Thousands
Dec. 31, 2022
USD ($)
Security
Dec. 31, 2021
USD ($)
Security
Net Unrealized Gains And Losses On Investments [Line Items]    
Less than 12 months, Fair Value $ 887,036 $ 1,825,891
Less than 12 months, Unrealized Losses $ (54,828) $ (31,548)
Less than 12 months, Number of Securities | Security 498 187
12 months or more, Fair Value $ 1,619,473 $ 252,725
12 months or more, Unrealized Losses $ (291,079) $ (5,227)
12 months or more, Number of Securities | Security 264 35
Fair Value, Total $ 2,506,509 $ 2,078,616
Unrealized Losses, Total $ (345,907) $ (36,775)
Number of Securities Total | Security 762 222
U.S. Government Sponsored Entities and Agencies [Member]    
Net Unrealized Gains And Losses On Investments [Line Items]    
Less than 12 months, Fair Value $ 107,011 $ 114,486
Less than 12 months, Unrealized Losses $ (8,435) $ (1,865)
Less than 12 months, Number of Securities | Security 35 12
12 months or more, Fair Value $ 118,779 $ 32,688
12 months or more, Unrealized Losses $ (25,015) $ (1,175)
12 months or more, Number of Securities | Security 13 4
Fair Value, Total $ 225,790 $ 147,174
Unrealized Losses, Total $ (33,450) $ (3,040)
Number of Securities Total | Security 48 16
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]    
Net Unrealized Gains And Losses On Investments [Line Items]    
Less than 12 months, Fair Value $ 514,789 $ 1,568,138
Less than 12 months, Unrealized Losses $ (39,246) $ (29,060)
Less than 12 months, Number of Securities | Security 294 143
12 months or more, Fair Value $ 1,328,906 $ 141,681
12 months or more, Unrealized Losses $ (258,741) $ (3,386)
12 months or more, Number of Securities | Security 202 23
Fair Value, Total $ 1,843,695 $ 1,709,819
Unrealized Losses, Total $ (297,987) $ (32,446)
Number of Securities Total | Security 496 166
Commercial Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]    
Net Unrealized Gains And Losses On Investments [Line Items]    
Less than 12 months, Fair Value $ 190,189 $ 131,970
Less than 12 months, Unrealized Losses $ (5,106) $ (579)
Less than 12 months, Number of Securities | Security 38 25
12 months or more, Fair Value $ 159,543 $ 78,356
12 months or more, Unrealized Losses $ (4,974) $ (666)
12 months or more, Number of Securities | Security 36 8
Fair Value, Total $ 349,732 $ 210,326
Unrealized Losses, Total $ (10,080) $ (1,245)
Number of Securities Total | Security 74 33
Obligations of State and Political Subdivisions [Member]    
Net Unrealized Gains And Losses On Investments [Line Items]    
Less than 12 months, Fair Value $ 67,822 $ 4,307
Less than 12 months, Unrealized Losses $ (1,815) $ (35)
Less than 12 months, Number of Securities | Security 128 2
12 months or more, Fair Value $ 7,812  
12 months or more, Unrealized Losses $ (2,282)  
12 months or more, Number of Securities | Security 10  
Fair Value, Total $ 75,634 $ 4,307
Unrealized Losses, Total $ (4,097) $ (35)
Number of Securities Total | Security 138 2
Corporate Debt Securities [Member]    
Net Unrealized Gains And Losses On Investments [Line Items]    
Less than 12 months, Fair Value $ 7,225 $ 6,990
Less than 12 months, Unrealized Losses $ (226) $ (9)
Less than 12 months, Number of Securities | Security 3 5
12 months or more, Fair Value $ 4,433  
12 months or more, Unrealized Losses $ (67)  
12 months or more, Number of Securities | Security 3  
Fair Value, Total $ 11,658 $ 6,990
Unrealized Losses, Total $ (293) $ (9)
Number of Securities Total | Security 6 5