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Investment Securities and Other Investments - Summary of Unrealized Losses (Detail)
$ in Thousands
Sep. 30, 2023
USD ($)
Security
Dec. 31, 2022
USD ($)
Security
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Number of Securities | Security 212 221
Available-for-sale Securities, Fair Value, Less Than 12 Months $ 13,087 $ 93,180
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months (1,089) (8,561)
Available-for-sale Securities, Fair Value, 12 Months or Greater 289,677 242,340
Available-for-sale Securities, Unrealized Losses, 12 months or Greater (68,712) (50,288)
Fair Value, Total 302,764 335,520
Unrealized Losses, Total $ (69,801) $ (58,849)
State and Municipal [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Number of Securities | Security 71 82
Available-for-sale Securities, Fair Value, Less Than 12 Months $ 2,026 $ 18,252
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months (54) (2,178)
Available-for-sale Securities, Fair Value, 12 Months or Greater 39,251 31,530
Available-for-sale Securities, Unrealized Losses, 12 months or Greater (9,791) (6,847)
Fair Value, Total 41,277 49,782
Unrealized Losses, Total $ (9,845) $ (9,025)
U.S. Treasury and Agencies [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Number of Securities | Security 25 28
Available-for-sale Securities, Fair Value, Less Than 12 Months $ 479 $ 9,904
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months   (1,039)
Available-for-sale Securities, Fair Value, 12 Months or Greater 59,410 56,686
Available-for-sale Securities, Unrealized Losses, 12 months or Greater (12,651) (11,872)
Fair Value, Total 59,889 66,590
Unrealized Losses, Total $ (12,651) $ (12,911)
Mortgage Backed Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Number of Securities | Security 83 78
Available-for-sale Securities, Fair Value, Less Than 12 Months $ 1,013 $ 39,006
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months (104) (3,061)
Available-for-sale Securities, Fair Value, 12 Months or Greater 171,876 148,449
Available-for-sale Securities, Unrealized Losses, 12 months or Greater (42,801) (30,669)
Fair Value, Total 172,889 187,455
Unrealized Losses, Total $ (42,905) $ (33,730)
Corporate Bonds [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Number of Securities | Security 33 33
Available-for-sale Securities, Fair Value, Less Than 12 Months $ 9,569 $ 26,018
Available-for-sale Securities, Unrealized Losses, Less Than 12 Months (931) (2,283)
Available-for-sale Securities, Fair Value, 12 Months or Greater 19,140 5,675
Available-for-sale Securities, Unrealized Losses, 12 months or Greater (3,469) (900)
Fair Value, Total 28,709 31,693
Unrealized Losses, Total $ (4,400) $ (3,183)