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Securities - Summary of Securities Available-for-Sale and Restricted Stock (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized Cost, Available-for-sale $ 160,589 $ 164,705
Gross Unrealized Gains, Available-for-sale 2 72
Gross Unrealized Losses, Available-for-sale (15,234) (14,708)
Fair Value, Available-for-sale 145,357 150,069
Amortized Cost, Held to maturity 238,222 247,401
Gross Unrealized Gains, Held to maturity   1
Gross Unrealized Losses, Held to maturity (34,243) (35,448)
Fair Value, Held to maturity 203,979 211,954
Amortized Cost 400,603 415,721
Gross Unrealized Gains 74 132
Gross Unrealized Losses (49,477) (50,156)
Fair Value 351,200 365,697
U.S. Treasury Securities [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized Cost, Available-for-sale 23,153 23,194
Gross Unrealized Losses, Available-for-sale (828) (969)
Fair Value, Available-for-sale 22,325 22,225
Amortized Cost, Held to maturity 12,779 12,753
Gross Unrealized Losses, Held to maturity (1,033) (1,136)
Fair Value, Held to maturity 11,746 11,617
U.S. Government Agencies [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized Cost, Available-for-sale 13,999 13,999
Gross Unrealized Losses, Available-for-sale (1,263) (1,369)
Fair Value, Available-for-sale 12,736 12,630
Mortgage-Backed Securities of Government Agencies [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized Cost, Available-for-sale 73,271 77,677
Gross Unrealized Gains, Available-for-sale 2 72
Gross Unrealized Losses, Available-for-sale (8,640) (8,859)
Fair Value, Available-for-sale 64,633 68,890
Amortized Cost, Held to maturity 222,878 232,068
Gross Unrealized Losses, Held to maturity (32,966) (34,051)
Fair Value, Held to maturity 189,912 198,017
Asset-Backed Securities of Government Agencies [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized Cost, Available-for-sale 583 633
Gross Unrealized Losses, Available-for-sale (35) (15)
Fair Value, Available-for-sale 548 618
State and Political Subdivisions [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized Cost, Available-for-sale 20,401 20,462
Gross Unrealized Losses, Available-for-sale (1,043) (985)
Fair Value, Available-for-sale 19,358 19,477
Amortized Cost, Held to maturity 2,565 2,580
Gross Unrealized Gains, Held to maturity   1
Gross Unrealized Losses, Held to maturity (244) (261)
Fair Value, Held to maturity 2,321 2,320
Corporate Bonds [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized Cost, Available-for-sale 29,182 28,740
Gross Unrealized Losses, Available-for-sale (3,425) (2,511)
Fair Value, Available-for-sale 25,757 26,229
Equity Securities [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized Cost, Equity securities 185 185
Gross Unrealized Gains, Equity securities 72 59
Fair Value, Equity securities 257 244
Restricted Stock [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Amortized Cost 1,607 3,430
Fair Value $ 1,607 $ 3,430