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Securities - Schedule of Unrealized Losses on Investment Securities (Detail) $ in Thousands | Jun. 30, 2019 USD ($) Security | Dec. 31, 2018 USD ($) Security
--- | --- | ---
Net Unrealized Gains And Losses On Investments [Line Items] |  |
Less than 12 months, Fair Value | $ 42,613 | $ 466,878
Less than 12 months, Unrealized Losses | $ (233) | $ (3,372)
Less than 12 months, Number of Securities | Security | 13 | 284
12 months or more, Fair Value | $ 660,179 | $ 1,425,284
12 months or more, Unrealized Losses | $ (6,593) | $ (39,600)
12 months or more, Number of Securities | Security | 307 | 837
Fair Value, Total | $ 702,792 | $ 1,892,162
Unrealized Losses, Total | $ (6,826) | $ (42,972)
Number of Securities Total | Security | 320 | 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 |  | $ 18,926
Less than 12 months, Unrealized Losses |  | $ (148)
Less than 12 months, Number of Securities | Security |  | 8
12 months or more, Fair Value | $ 28,542 | $ 76,385
12 months or more, Unrealized Losses | $ (242) | $ (1,937)
12 months or more, Number of Securities | Security | 7 | 14
Fair Value, Total | $ 28,542 | $ 95,311
Unrealized Losses, Total | $ (242) | $ (2,085)
Number of Securities Total | Security | 7 | 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 | $ 30,301 | $ 285,534
Less than 12 months, Unrealized Losses | $ (95) | $ (1,862)
Less than 12 months, Number of Securities | Security | 4 | 44
12 months or more, Fair Value | $ 564,036 | $ 922,698
12 months or more, Unrealized Losses | $ (5,988) | $ (29,829)
12 months or more, Number of Securities | Security | 211 | 291
Fair Value, Total | $ 594,337 | $ 1,208,232
Unrealized Losses, Total | $ (6,083) | $ (31,691)
Number of Securities Total | Security | 215 | 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 | $ 3,783 | $ 9,186
Less than 12 months, Unrealized Losses | $ (26) | $ (18)
Less than 12 months, Number of Securities | Security | 4 | 6
12 months or more, Fair Value | $ 26,655 | $ 111,068
12 months or more, Unrealized Losses | $ (90) | $ (2,945)
12 months or more, Number of Securities | Security | 12 | 14
Fair Value, Total | $ 30,438 | $ 120,254
Unrealized Losses, Total | $ (116) | $ (2,963)
Number of Securities Total | Security | 16 | 20
Obligations of State and Political Subdivisions [Member] |  |
Net Unrealized Gains And Losses On Investments [Line Items] |  |
Less than 12 months, Fair Value | $ 609 | $ 104,469
Less than 12 months, Unrealized Losses | $ (1) | $ (439)
Less than 12 months, Number of Securities | Security | 2 | 207
12 months or more, Fair Value | $ 38,999 | $ 303,681
12 months or more, Unrealized Losses | $ (230) | $ (4,555)
12 months or more, Number of Securities | Security | 76 | 513
Fair Value, Total | $ 39,608 | $ 408,150
Unrealized Losses, Total | $ (231) | $ (4,994)
Number of Securities Total | Security | 78 | 720
Corporate Debt Securities [Member] |  |
Net Unrealized Gains And Losses On Investments [Line Items] |  |
Less than 12 months, Fair Value | $ 7,920 | $ 38,791
Less than 12 months, Unrealized Losses | $ (111) | $ (898)
Less than 12 months, Number of Securities | Security | 3 | 18
12 months or more, Fair Value | $ 1,947 | $ 11,452
12 months or more, Unrealized Losses | $ (43) | $ (334)
12 months or more, Number of Securities | Security | 1 | 5
Fair Value, Total | $ 9,867 | $ 50,243
Unrealized Losses, Total | $ (154) | $ (1,232)
Number of Securities Total | Security | 4 | 23

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