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Investment Securities (Disclosure Regarding Length of Time on Securities Available for Sale with Temporary Impairment) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2018
Debt Securities, Available-for-sale [Line Items]      
Less than 12 months, fair value $ 133,349 $ 138,283  
Less than 12 months, gross unrealized losses (1,205) (644)  
12 months or longer, fair value 10,470 46,819  
12 months or longer, gross unrealized losses (73) (504)  
Total, fair value 143,819 185,102  
Total, gross unrealized losses (1,278) (1,148)  
Agency Obligations      
Debt Securities, Available-for-sale [Line Items]      
Less than 12 months, fair value     $ 478
Less than 12 months, gross unrealized losses     (1)
12 months or longer, fair value     0
12 months or longer, gross unrealized losses     0
Total, fair value     478
Total, gross unrealized losses     $ (1)
Mortgage-Backed Securities      
Debt Securities, Available-for-sale [Line Items]      
Less than 12 months, fair value 84,276 136,270  
Less than 12 months, gross unrealized losses (835) (629)  
12 months or longer, fair value 8,489 46,819  
12 months or longer, gross unrealized losses (29) (504)  
Total, fair value 92,765 183,089  
Total, gross unrealized losses (864) (1,133)  
Asset-backed securities      
Debt Securities, Available-for-sale [Line Items]      
Less than 12 months, fair value 7,624    
Less than 12 months, gross unrealized losses (27)    
12 months or longer, fair value 0    
12 months or longer, gross unrealized losses 0    
Total, fair value 7,624    
Total, gross unrealized losses (27)    
State And Municipal Obligations      
Debt Securities, Available-for-sale [Line Items]      
Less than 12 months, fair value 34,033    
Less than 12 months, gross unrealized losses (331)    
12 months or longer, fair value 0    
12 months or longer, gross unrealized losses 0    
Total, fair value 34,033    
Total, gross unrealized losses (331)    
Corporate Obligations      
Debt Securities, Available-for-sale [Line Items]      
Less than 12 months, fair value 6,938 2,013  
Less than 12 months, gross unrealized losses (11) (15)  
12 months or longer, fair value 1,981 0  
12 months or longer, gross unrealized losses (44) 0  
Total, fair value 8,919 2,013  
Total, gross unrealized losses $ (55) $ (15)