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Securities - Summary of Gross Unrealized Losses and Fair Value of Available for Sale Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]    
Held-to-maturity, Gross Unrealized Losses, Total $ (34,243) $ (35,448)
Gross Unrealized Losses, Less Than 12 Months (1,174) (12,931)
Fair Value, Less Than 12 Months 37,124 135,499
Gross Unrealized Losses, 12 Months Or More (48,303) (37,225)
Fair Value, 12 Months Or More 309,090 217,374
Gross Unrealized Losses, Total (49,477) (50,156)
Fair Value, Total 346,214 352,873
U.S. Treasury Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale, Gross Unrealized Losses, Less Than 12 Months (111) (798)
Available-for-sale, Fair Value, Less Than 12 Months 3,877 17,405
Available-for-sale, Gross Unrealized Losses, 12 Months or More (717) (171)
Available-for-sale, Fair Value, 12 Months or More 18,448 4,820
Available-for-sale, Gross Unrealized Losses, Total (828) (969)
Available-for-sale, Fair Value, Total 22,325 22,225
Held-to-maturity, Gross Unrealized Losses, 12 Months Or More (1,033) (1,136)
Held-to-maturity, Fair Value, 12 Months Or More 11,746 11,617
Held-to-maturity, Gross Unrealized Losses, Total (1,033) (1,136)
Held-to-maturity, Fair Value, Total 11,746 11,617
U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale, Gross Unrealized Losses, 12 Months or More (1,263) (1,369)
Available-for-sale, Fair Value, 12 Months or More 12,736 12,630
Available-for-sale, Gross Unrealized Losses, Total (1,263) (1,369)
Available-for-sale, Fair Value, Total 12,736 12,630
Mortgage-Backed Securities of Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale, Gross Unrealized Losses, Less Than 12 Months (211) (1,046)
Available-for-sale, Fair Value, Less Than 12 Months 9,487 16,188
Available-for-sale, Gross Unrealized Losses, 12 Months or More (8,429) (7,813)
Available-for-sale, Fair Value, 12 Months or More 52,250 44,519
Available-for-sale, Gross Unrealized Losses, Total (8,640) (8,859)
Available-for-sale, Fair Value, Total 61,737 60,707
Held-to-maturity, Gross Unrealized Losses, Less Than 12 Months (626) (9,733)
Held-to-maturity, Fair Value, Less Than 12 Months 15,424 79,325
Held-to-maturity, Gross Unrealized Losses, 12 Months Or More (32,340) (24,318)
Held-to-maturity, Fair Value, 12 Months Or More 174,488 118,692
Held-to-maturity, Gross Unrealized Losses, Total (32,966) (34,051)
Held-to-maturity, Fair Value, Total 189,912 198,017
Asset-Backed Securities of Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale, Gross Unrealized Losses, 12 Months or More (35) (15)
Available-for-sale, Fair Value, 12 Months or More 548 618
Available-for-sale, Gross Unrealized Losses, Total (35) (15)
Available-for-sale, Fair Value, Total 548 618
State and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale, Gross Unrealized Losses, Less Than 12 Months (98) (189)
Available-for-sale, Fair Value, Less Than 12 Months 7,059 9,079
Available-for-sale, Gross Unrealized Losses, 12 Months or More (945) (796)
Available-for-sale, Fair Value, 12 Months or More 12,073 9,848
Available-for-sale, Gross Unrealized Losses, Total (1,043) (985)
Available-for-sale, Fair Value, Total 19,132 18,927
Held-to-maturity, Gross Unrealized Losses, Less Than 12 Months (4)  
Held-to-maturity, Fair Value, Less Than 12 Months 410  
Held-to-maturity, Gross Unrealized Losses, 12 Months Or More (240) (261)
Held-to-maturity, Fair Value, 12 Months Or More 1,911 1,903
Held-to-maturity, Gross Unrealized Losses, Total (244) (261)
Held-to-maturity, Fair Value, Total 2,321 1,903
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale, Gross Unrealized Losses, Less Than 12 Months (124) (1,165)
Available-for-sale, Fair Value, Less Than 12 Months 867 13,502
Available-for-sale, Gross Unrealized Losses, 12 Months or More (3,301) (1,346)
Available-for-sale, Fair Value, 12 Months or More 24,890 12,727
Available-for-sale, Gross Unrealized Losses, Total (3,425) (2,511)
Available-for-sale, Fair Value, Total $ 25,757 $ 26,229