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Investment Securities - Amount of Securities in Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than twelve months, fair value $ 0 $ 26,767
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss 0 (110)
Twelve months or longer, fair value 0 0
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss 0 0
Total, fair value 0 26,767
Debt securities, held-to-maturity, unrealized loss position, accumulated loss 0 (110)
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 18,222 22,825
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss (77) (62)
Twelve months or longer, fair value 31 115,773
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss (1) (5,443)
Total, fair value 18,253 138,598
Available-for-sale securities, continuous unrealized loss position, accumulated loss (78) (5,505)
U.S. Government Corporations and Agencies [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than twelve months, fair value   0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss   0
Twelve months or longer, fair value   300
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss   (1)
Total, fair value   300
Available-for-sale securities, continuous unrealized loss position, accumulated loss   (1)
Residential Mortgage-Backed Securities [Member]    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than twelve months, fair value   26,767
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss   (110)
Twelve months or longer, fair value   0
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss   0
Total, fair value   26,767
Debt securities, held-to-maturity, unrealized loss position, accumulated loss   (110)
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 13,677 21,827
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss (62) (62)
Twelve months or longer, fair value 31 48,672
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss (1) (413)
Total, fair value 13,708 70,499
Available-for-sale securities, continuous unrealized loss position, accumulated loss (63) (475)
Collateralized Mortgage Obligations [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 4,545 0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss (15) 0
Twelve months or longer, fair value 0 1,295
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss 0 (22)
Total, fair value 4,545 1,295
Available-for-sale securities, continuous unrealized loss position, accumulated loss $ (15) (22)
Corporate Bonds [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than twelve months, fair value   998
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss   0
Twelve months or longer, fair value   65,506
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss   (5,007)
Total, fair value   66,504
Available-for-sale securities, continuous unrealized loss position, accumulated loss   $ (5,007)