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Investment Securities (Held to Maturity) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost $ 378,919 $ 387,950
Gross unrealized gains 168 269
Gross unrealized losses (14,058) (14,751)
Held-to-maturity, debt securities 365,029 373,468
Agency obligations    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost 12,096 9,997
Gross unrealized gains 0 0
Gross unrealized losses (929) (1,033)
Held-to-maturity, debt securities 11,167 8,964
State and municipal obligations    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost 357,003 366,164
Gross unrealized gains 168 268
Gross unrealized losses (12,510) (13,015)
Held-to-maturity, debt securities 344,661 353,417
Corporate obligations    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost 9,820 11,789
Gross unrealized gains 0 1
Gross unrealized losses (619) (703)
Held-to-maturity, debt securities $ 9,201 $ 11,087