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Investment Securities - Investment Securities in Continuous Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months $ 6,026 $ 35,727
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (19) (551)
Estimated fair value, 12 months or more 89,217 80,018
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (7,285) (8,519)
Held to maturity, Estimated fair value, Less than 12 months 103,646 2,039
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses (75) (11)
Held to maturity, Estimated fair value, 12 months or more 51,250 52,418
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses (14,824) (17,938)
Total investment securities, fair value less than 12 months 109,672 37,766
Investment Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses (94) (562)
Total of investment securities, fair value, 12 Months or More 140,467 132,436
Investment Securities Continuous Unrealized Loss Position Twelve Months or Longer Aggregate Losses (22,109) (26,457)
U.S. Treasury and Federal Agencies [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months 1,429 985
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (1) (14)
Held to maturity, Estimated fair value, Less than 12 months 3,078  
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses (2)  
Government Issued or Guaranteed [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months 2,516 18,687
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (7) (356)
Estimated fair value, 12 months or more 24,307 16,556
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (576) (399)
Held to maturity, Estimated fair value, Less than 12 months 100,568 2,039
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses (73) (11)
Held to maturity, Estimated fair value, 12 months or more 1,633  
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses (22)  
Other Debt Securities [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months 2,081 16,055
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (11) (181)
Estimated fair value, 12 months or more 64,910 63,462
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (6,709) (8,120)
Privately Issued [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Held to maturity, Estimated fair value, 12 months or more 49,617 52,418
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses $ (14,802) $ (17,938)