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Securities - Schedule of Unrealized Losses on Investment Securities (Detail) $ in Thousands | Sep. 30, 2019 USD ($) Security | Dec. 31, 2018 USD ($) Security
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Net Unrealized Gains And Losses On Investments [Line Items] |  |
Less than 12 months, Fair Value | $ 376,947 | $ 466,878
Less than 12 months, Unrealized Losses | $ (1,609) | $ (3,372)
Less than 12 months, Number of Securities | Security | 98 | 284
12 months or more, Fair Value | $ 332,683 | $ 1,425,284
12 months or more, Unrealized Losses | $ (3,362) | $ (39,600)
12 months or more, Number of Securities | Security | 152 | 837
Fair Value, Total | $ 709,630 | $ 1,892,162
Unrealized Losses, Total | $ (4,971) | $ (42,972)
Number of Securities Total | Security | 250 | 1,121
US Treasury Securities [Member] |  |
Net Unrealized Gains And Losses On Investments [Line Items] |  |
Less than 12 months, Fair Value |  | $ 9,972
Less than 12 months, Unrealized Losses |  | $ (7)
Less than 12 months, Number of Securities | Security |  | 1
Fair Value, Total |  | $ 9,972
Unrealized Losses, Total |  | $ (7)
Number of Securities Total | Security |  | 1
U.S. Government Sponsored Entities and Agencies [Member] |  |
Net Unrealized Gains And Losses On Investments [Line Items] |  |
Less than 12 months, Fair Value | $ 5,383 | $ 18,926
Less than 12 months, Unrealized Losses | $ (17) | $ (148)
Less than 12 months, Number of Securities | Security | 4 | 8
12 months or more, Fair Value | $ 6,781 | $ 76,385
12 months or more, Unrealized Losses | $ (108) | $ (1,937)
12 months or more, Number of Securities | Security | 2 | 14
Fair Value, Total | $ 12,164 | $ 95,311
Unrealized Losses, Total | $ (125) | $ (2,085)
Number of Securities Total | Security | 6 | 22
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member] |  |
Net Unrealized Gains And Losses On Investments [Line Items] |  |
Less than 12 months, Fair Value | $ 347,848 | $ 285,534
Less than 12 months, Unrealized Losses | $ (1,515) | $ (1,862)
Less than 12 months, Number of Securities | Security | 70 | 44
12 months or more, Fair Value | $ 306,696 | $ 922,698
12 months or more, Unrealized Losses | $ (2,986) | $ (29,829)
12 months or more, Number of Securities | Security | 128 | 291
Fair Value, Total | $ 654,544 | $ 1,208,232
Unrealized Losses, Total | $ (4,501) | $ (31,691)
Number of Securities Total | Security | 198 | 335
Commercial Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member] |  |
Net Unrealized Gains And Losses On Investments [Line Items] |  |
Less than 12 months, Fair Value | $ 11,066 | $ 9,186
Less than 12 months, Unrealized Losses | $ (38) | $ (18)
Less than 12 months, Number of Securities | Security | 3 | 6
12 months or more, Fair Value | $ 3,729 | $ 111,068
12 months or more, Unrealized Losses | $ (7) | $ (2,945)
12 months or more, Number of Securities | Security | 2 | 14
Fair Value, Total | $ 14,795 | $ 120,254
Unrealized Losses, Total | $ (45) | $ (2,963)
Number of Securities Total | Security | 5 | 20
Obligations of State and Political Subdivisions [Member] |  |
Net Unrealized Gains And Losses On Investments [Line Items] |  |
Less than 12 months, Fair Value | $ 12,650 | $ 104,469
Less than 12 months, Unrealized Losses | $ (39) | $ (439)
Less than 12 months, Number of Securities | Security | 21 | 207
12 months or more, Fair Value | $ 7,581 | $ 303,681
12 months or more, Unrealized Losses | $ (132) | $ (4,555)
12 months or more, Number of Securities | Security | 17 | 513
Fair Value, Total | $ 20,231 | $ 408,150
Unrealized Losses, Total | $ (171) | $ (4,994)
Number of Securities Total | Security | 38 | 720
Corporate Debt Securities [Member] |  |
Net Unrealized Gains And Losses On Investments [Line Items] |  |
Less than 12 months, Fair Value |  | $ 38,791
Less than 12 months, Unrealized Losses |  | $ (898)
Less than 12 months, Number of Securities | Security |  | 18
12 months or more, Fair Value | $ 7,896 | $ 11,452
12 months or more, Unrealized Losses | $ (129) | $ (334)
12 months or more, Number of Securities | Security | 3 | 5
Fair Value, Total | $ 7,896 | $ 50,243
Unrealized Losses, Total | $ (129) | $ (1,232)
Number of Securities Total | Security | 3 | 23

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