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Investment Securities - Amount of Securities in Unrealized Loss Position (Detail)
$ in Thousands
Sep. 30, 2020
USD ($)
loan
Investment
Jun. 30, 2020
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
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 Gain (Loss) [Abstract]        
Less than twelve months, fair value 13,726     22,825
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss (63)     (62)
Twelve months or longer, fair value 32     115,773
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss (1)     (5,443)
Total, fair value 13,758     138,598
Available-for-sale securities, continuous unrealized loss position, accumulated loss (64)     (5,505)
Debt Securities, Available-for-sale, Unrealized Loss Position 55,100      
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 5,900      
Debt securities, available-for-sale, allowance for credit loss 692      
U.S. Government Corporations and Agencies [Member]        
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]        
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)
Debt securities, available-for-sale, allowance for credit loss 0      
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 Gain (Loss) [Abstract]        
Less than twelve months, fair value 8,747     21,827
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss (60)     (62)
Twelve months or longer, fair value 32     48,672
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss (1)     (413)
Total, fair value 8,779     70,499
Available-for-sale securities, continuous unrealized loss position, accumulated loss $ (61)     (475)
Number of securities | loan 4      
Debt securities, available-for-sale, allowance for credit loss $ 0      
Collateralized Mortgage Obligations [Member]        
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]        
Less than twelve months, fair value 4,979     0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss (3)     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 4,979     1,295
Available-for-sale securities, continuous unrealized loss position, accumulated loss (3)     (22)
Debt securities, available-for-sale, allowance for credit loss $ 0      
Corporate Bonds [Member]        
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]        
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)
Number of securities | Investment 8      
Debt securities, available-for-sale, allowance for credit loss $ 692 $ 855 $ 0 $ 0