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Investment Securities - Amount of Securities in Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than twelve months, fair value $ 20,960 $ 48,192
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss (147) (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 20,960 89,585
Debt securities, held-to-maturity, unrealized loss position, accumulated loss (147) (1,346)
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]    
Less than twelve months, fair value 34,830 34,595
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss (147) (418)
Twelve months or longer, fair value 121,398 249,870
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss (7,728) (14,180)
Total, fair value 156,228 284,465
Available-for-sale securities, continuous unrealized loss position, accumulated loss (7,875) (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 Gain (Loss) [Abstract]    
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 299 15,315
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss (2) (96)
Total, fair value 299 15,315
Available-for-sale securities, continuous unrealized loss position, accumulated loss (2) (96)
State and Political Subdivisions [Member]    
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]    
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 20,960 48,192
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss (147) (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 20,960 82,693
Debt securities, held-to-maturity, unrealized loss position, accumulated loss (147) (1,242)
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]    
Less than twelve months, fair value 33,830 7,099
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss (147) (106)
Twelve months or longer, fair value 51,166 141,924
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss (453) (4,743)
Total, fair value 84,996 149,023
Available-for-sale securities, continuous unrealized loss position, accumulated loss (600) (4,849)
Collateralized Mortgage Obligations [Member]    
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]    
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 1,380 1,599
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss (23) (78)
Total, fair value 1,380 2,888
Available-for-sale securities, continuous unrealized loss position, accumulated loss (23) (94)
Corporate Bonds [Member]    
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]    
Less than twelve months, fair value 1,000 16,896
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss 0 (235)
Twelve months or longer, fair value 68,553 75,730
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss (7,250) (9,099)
Total, fair value 69,553 92,626
Available-for-sale securities, continuous unrealized loss position, accumulated loss $ (7,250) $ (9,334)