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Investment Securities - Gross Unrealized Losses on Investment Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Debt Securities Available for Sale, Less than 12 months, Fair Value $ 336,433 $ 289,271
Debt Securities Available for Sale, Less than 12 months, Unrealized Loss (6,148) (2,211)
Debt Securities Available for Sale, 12 months or more, Fair Value 415,349 183,423
Debt Securities Available for Sale, 12 months or more, Unrealized Loss (16,061) (3,719)
Debt Securities Available for Sale, Fair Value 751,782 472,694
Debt Securities Available for Sale, Unrealized Loss (22,209) (5,930)
Debt Securities Held to Maturity, Less than 12 months, Fair Value 229,596 94,505
Debt Securities Held to Maturity, Less than 12 months, Unrealized Loss (2,733) (574)
Debt Securities Held to Maturity, 12 months or more, Fair Value 162,690 98,004
Debt Securities Held to Maturity, 12 months or more, Unrealized Loss (5,242) (1,352)
Debt Securities Held to Maturity, Fair Value 392,286 192,509
Debt Securities Held to Maturity, Unrealized Loss (7,975) (1,926)
Obligations of U.S. Government Agencies [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities Available for Sale, Less than 12 months, Fair Value 171,309 284,367
Debt Securities Available for Sale, Less than 12 months, Unrealized Loss (3,588) (2,176)
Debt Securities Available for Sale, 12 months or more, Fair Value 394,630 166,338
Debt Securities Available for Sale, 12 months or more, Unrealized Loss (14,490) (3,425)
Debt Securities Available for Sale, Fair Value 565,939 450,705
Debt Securities Available for Sale, Unrealized Loss (18,078) (5,601)
Debt Securities Held to Maturity, Less than 12 months, Fair Value 223,810 93,017
Debt Securities Held to Maturity, Less than 12 months, Unrealized Loss (2,619) (567)
Debt Securities Held to Maturity, 12 months or more, Fair Value 158,648 95,367
Debt Securities Held to Maturity, 12 months or more, Unrealized Loss (5,126) (1,322)
Debt Securities Held to Maturity, Fair Value 382,458 188,384
Debt Securities Held to Maturity, Unrealized Loss (7,745) (1,889)
Obligations of States and Political Subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities Available for Sale, Less than 12 months, Fair Value 63,738 4,904
Debt Securities Available for Sale, Less than 12 months, Unrealized Loss (1,541) (35)
Debt Securities Available for Sale, 12 months or more, Fair Value 20,719 17,085
Debt Securities Available for Sale, 12 months or more, Unrealized Loss (1,571) (294)
Debt Securities Available for Sale, Fair Value 84,457 21,989
Debt Securities Available for Sale, Unrealized Loss (3,112) (329)
Debt Securities Held to Maturity, Less than 12 months, Fair Value 5,786 1,488
Debt Securities Held to Maturity, Less than 12 months, Unrealized Loss (114) (7)
Debt Securities Held to Maturity, 12 months or more, Fair Value 4,042 2,637
Debt Securities Held to Maturity, 12 months or more, Unrealized Loss (116) (30)
Debt Securities Held to Maturity, Fair Value 9,828 4,125
Debt Securities Held to Maturity, Unrealized Loss (230) $ (37)
Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities Available for Sale, Less than 12 months, Fair Value 101,386  
Debt Securities Available for Sale, Less than 12 months, Unrealized Loss (1,019)  
Debt Securities Available for Sale, Fair Value 101,386  
Debt Securities Available for Sale, Unrealized Loss $ (1,019)