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Investment Securities - Schedule of Securities with Gross Unrealized Losses Aggregated by Investment Category (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Gross Unrealized Losses    
Less than twelve months $ (23) $ (9)
Over twelve months (677) (862)
Total (700) (871)
Estimated Fair Value    
Less than twelve months 4,696 2,287
Over twelve months 22,485 29,402
Total 27,181 31,689
Gross Unrealized Losses    
Less than twelve months (1,300) (1,191)
Over twelve months (2,742) (9,528)
Total (4,042) (10,719)
Estimated Fair Value    
Less than twelve months 279,984 304,871
Over twelve months 220,790 535,047
Total 500,774 839,918
U.S. Government-Sponsored Enterprise Obligations    
Gross Unrealized Losses    
Less than twelve months 0 0
Over twelve months (45) (3,533)
Total (45) (3,533)
Estimated Fair Value    
Less than twelve months 0 0
Over twelve months 28,449 240,498
Total 28,449 240,498
Obligations of States and Political Subdivisions    
Gross Unrealized Losses    
Less than twelve months (6) (9)
Over twelve months (68) (136)
Total (74) (145)
Estimated Fair Value    
Less than twelve months 3,642 2,287
Over twelve months 4,199 8,590
Total 7,841 10,877
Gross Unrealized Losses    
Less than twelve months   (2)
Over twelve months   0
Total   (2)
Estimated Fair Value    
Less than twelve months   185
Over twelve months   0
Total   185
Mortgage-Backed Securities    
Gross Unrealized Losses    
Less than twelve months (17) 0
Over twelve months (609) (726)
Total (626) (726)
Estimated Fair Value    
Less than twelve months 1,054 0
Over twelve months 18,286 20,812
Total 19,340 20,812
Gross Unrealized Losses    
Less than twelve months (954) (1,189)
Over twelve months (2,693) (5,995)
Total (3,647) (7,184)
Estimated Fair Value    
Less than twelve months 252,358 304,686
Over twelve months 191,836 294,549
Total 444,194 $ 599,235
Other Securities    
Gross Unrealized Losses    
Less than twelve months (346)  
Over twelve months (4)  
Total (350)  
Estimated Fair Value    
Less than twelve months 27,626  
Over twelve months 505  
Total $ 28,131