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Investment Securities - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Investment
Dec. 31, 2018
USD ($)
Investment
Dec. 31, 2017
USD ($)
Debt Securities, Available-for-sale [Line Items]      
Carrying value of securities pledged to secure public deposits and other contractual obligations $ 340,800 $ 344,200  
Pledging requirements for credit derivatives and SWAP agreements - securities $ 12,500 $ 296  
Number of investments in non-federal issuer representing more than 10% of shareholders' equity | Investment 0 0  
Maximum investment in any single non-federal issuer representing shareholders' equity 10.00% 10.00%  
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year 52    
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss $ (5,443) $ (14,180)  
Proceeds from sales 26,494 1,010 $ 7,069
Equity Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Unrealized loss on equity securities   153  
Proceeds from sales $ 0 0  
U.S. Government Corporations and Agencies [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | Investment 1    
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss $ (1) (96)  
Corporate Bonds [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | Investment 10    
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss $ (5,007) (9,099)  
Mortgage-Backed Securities [Domain]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | Investment 40    
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss $ (413)    
State and Political Subdivisions [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss   (164)  
Collateralized Mortgage Obligations [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | Investment 1    
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss $ (22) $ (78)  
Other Noninterest Income [Member] | Equity Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Net realized gain on equity securities $ 80