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Investment Securities - Amount of Securities in Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than twelve months, fair value $ 26,767 $ 48,192
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss (110) (472)
Twelve months or longer, fair value 0 41,393
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss 0 (874)
Total, fair value 26,767 89,585
Debt securities, held-to-maturity, unrealized loss position, accumulated loss (110) (1,346)
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 22,825 34,595
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss (62) (418)
Twelve months or longer, fair value 115,773 249,870
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss (5,443) (14,180)
Total, fair value 138,598 284,465
Available-for-sale securities, continuous unrealized loss position, accumulated loss (5,505) (14,598)
U.S. Government Corporations and Agencies [Member]    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than twelve months, fair value   0
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss   0
Twelve months or longer, fair value   6,892
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss   (104)
Total, fair value   6,892
Debt securities, held-to-maturity, unrealized loss position, accumulated loss   (104)
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 0 0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss 0 0
Twelve months or longer, fair value 300 15,315
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss (1) (96)
Total, fair value 300 15,315
Available-for-sale securities, continuous unrealized loss position, accumulated loss (1) (96)
State and Political Subdivisions [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than twelve months, fair value   9,311
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss   (61)
Twelve months or longer, fair value   15,302
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss   (164)
Total, fair value   24,613
Available-for-sale securities, continuous unrealized loss position, accumulated loss   (225)
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 48,192
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss (110) (472)
Twelve months or longer, fair value 0 34,501
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss 0 (770)
Total, fair value 26,767 82,693
Debt securities, held-to-maturity, unrealized loss position, accumulated loss (110) (1,242)
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 21,827 7,099
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss (62) (106)
Twelve months or longer, fair value 48,672 141,924
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss (413) (4,743)
Total, fair value 70,499 149,023
Available-for-sale securities, continuous unrealized loss position, accumulated loss (475) (4,849)
Collateralized Mortgage Obligations [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 0 1,289
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss 0 (16)
Twelve months or longer, fair value 1,295 1,599
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss (22) (78)
Total, fair value 1,295 2,888
Available-for-sale securities, continuous unrealized loss position, accumulated loss (22) (94)
Corporate Bonds [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than twelve months, fair value 998 16,896
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss 0 (235)
Twelve months or longer, fair value 65,506 75,730
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss (5,007) (9,099)
Total, fair value 66,504 92,626
Available-for-sale securities, continuous unrealized loss position, accumulated loss $ (5,007) $ (9,334)