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Investment Securities - Gross Unrealized Losses on Investment Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Debt Securities Available for Sale, Less than 12 months, Fair Value $ 274,950 $ 336,433
Debt Securities Available for Sale, Less than 12 months, Unrealized Loss (4,845) (6,148)
Debt Securities Available for Sale, 12 months or more, Fair Value 123,833 415,349
Debt Securities Available for Sale, 12 months or more, Unrealized Loss (2,489) (16,061)
Debt Securities Available for Sale, Fair Value 398,783 751,782
Debt Securities Available for Sale, Unrealized Loss (7,334) (22,209)
Debt Securities Held to Maturity, Less than 12 months, Fair Value 18,813 229,596
Debt Securities Held to Maturity, Less than 12 months, Unrealized Loss (142) (2,733)
Debt Securities Held to Maturity, 12 months or more, Fair Value 62,952 162,690
Debt Securities Held to Maturity, 12 months or more, Unrealized Loss (338) (5,242)
Debt Securities Held to Maturity, Fair Value 81,765 392,286
Debt Securities Held to Maturity, Unrealized Loss (480) (7,975)
Obligations of U.S. government agencies    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities Available for Sale, Less than 12 months, Fair Value 36,709 171,309
Debt Securities Available for Sale, Less than 12 months, Unrealized Loss (309) (3,588)
Debt Securities Available for Sale, 12 months or more, Fair Value 23,852 394,630
Debt Securities Available for Sale, 12 months or more, Unrealized Loss (111) (14,490)
Debt Securities Available for Sale, Fair Value 60,561 565,939
Debt Securities Available for Sale, Unrealized Loss (420) (18,078)
Debt Securities Held to Maturity, Less than 12 months, Fair Value 18,813 223,810
Debt Securities Held to Maturity, Less than 12 months, Unrealized Loss (142) (2,619)
Debt Securities Held to Maturity, 12 months or more, Fair Value 62,952 158,648
Debt Securities Held to Maturity, 12 months or more, Unrealized Loss (338) (5,126)
Debt Securities Held to Maturity, Fair Value 81,765 382,458
Debt Securities Held to Maturity, Unrealized Loss (480) (7,745)
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities Available for Sale, Less than 12 months, Fair Value 778 63,738
Debt Securities Available for Sale, Less than 12 months, Unrealized Loss (1) (1,541)
Debt Securities Available for Sale, 12 months or more, Fair Value 0 20,719
Debt Securities Available for Sale, 12 months or more, Unrealized Loss 0 (1,571)
Debt Securities Available for Sale, Fair Value 778 84,457
Debt Securities Available for Sale, Unrealized Loss (1) (3,112)
Debt Securities Held to Maturity, Less than 12 months, Fair Value 0 5,786
Debt Securities Held to Maturity, Less than 12 months, Unrealized Loss 0 (114)
Debt Securities Held to Maturity, 12 months or more, Fair Value 0 4,042
Debt Securities Held to Maturity, 12 months or more, Unrealized Loss 0 (116)
Debt Securities Held to Maturity, Fair Value 0 9,828
Debt Securities Held to Maturity, Unrealized Loss 0 (230)
Asset backed securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities Available for Sale, Less than 12 months, Fair Value 237,463 101,386
Debt Securities Available for Sale, Less than 12 months, Unrealized Loss (4,535) (1,019)
Debt Securities Available for Sale, 12 months or more, Fair Value 99,981 0
Debt Securities Available for Sale, 12 months or more, Unrealized Loss (2,378) 0
Debt Securities Available for Sale, Fair Value 337,444 101,386
Debt Securities Available for Sale, Unrealized Loss $ (6,913) $ (1,019)