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Securities - Schedule of Fair Value of Available-for-Sale and Held-to-Maturity Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |
Total available-for-sale securities, One Year or less | $ 39,014 |
Total available-for-sale securities, One to Five Years | 91,686 |
Total available-for-sale securities, Five to Ten Years | 102,340 |
Total available-for-sale securities, After Ten Years | 54,340 |
Total available-for-sale securities, Mortgage-backed and Equity | 1,841,904 |
Available-for-sale, Estimated Fair Value | 2,129,284 | $ 2,114,129
Total held-to-maturity securities, One Year or less | 15,652 |
Total held-to-maturity securities, One to Five Years | 126,637 |
Total held-to-maturity securities, Five to Ten Years | 358,156 |
Total held-to-maturity securities, After Ten Years | 274,016 |
Total held-to-maturity securities, Mortgage-backed and Equity | 147,073 |
Held-to-maturity securities, Fair value | 921,534 | 1,020,743
Total, One Year or less | 54,666 |
Total, One to Five Years | 218,323 |
Total, Five to Ten Years | 460,496 |
Total, After Ten Years, Fair value | 328,356 |
Total, Mortgage- backed and Equity | 1,988,977 |
Total, Fair value | 3,050,818 | 3,134,872
US Treasury Securities [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |
Total available-for-sale securities, One Year or less | 29,781 |
Available-for-sale, Estimated Fair Value | 29,781 | 19,878
U.S. Government Sponsored Entities and Agencies [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |
Total available-for-sale securities, One Year or less | 498 |
Total available-for-sale securities, One to Five Years | 6,048 |
Total available-for-sale securities, Five to Ten Years | 18,472 |
Total available-for-sale securities, After Ten Years | 9,363 |
Total available-for-sale securities, Mortgage-backed and Equity | 100,206 |
Available-for-sale, Estimated Fair Value | 134,587 | 141,652
Total held-to-maturity securities, Mortgage-backed and Equity | 9,952 |
Held-to-maturity securities, Fair value | 9,952 | 10,500
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |
Total available-for-sale securities, Mortgage-backed and Equity | 1,563,042 |
Available-for-sale, Estimated Fair Value | 1,563,042 | 1,561,255
Total held-to-maturity securities, Mortgage-backed and Equity | 137,121 |
Held-to-maturity securities, Fair value | 137,121 | 144,334
Commercial Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |
Total available-for-sale securities, Mortgage-backed and Equity | 178,656 |
Available-for-sale, Estimated Fair Value | 178,656 | 168,972
Obligations of State and Political Subdivisions [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |
Total available-for-sale securities, One Year or less | 8,108 |
Total available-for-sale securities, One to Five Years | 53,422 |
Total available-for-sale securities, Five to Ten Years | 76,671 |
Total available-for-sale securities, After Ten Years | 44,977 |
Available-for-sale, Estimated Fair Value | 183,178 | 185,114
Total held-to-maturity securities, One Year or less | 15,652 |
Total held-to-maturity securities, One to Five Years | 115,724 |
Total held-to-maturity securities, Five to Ten Years | 334,357 |
Total held-to-maturity securities, After Ten Years | 274,016 |
Held-to-maturity securities, Fair value | 739,749 | 833,279
Corporate Debt Securities [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |
Total available-for-sale securities, One Year or less | 627 |
Total available-for-sale securities, One to Five Years | 32,216 |
Total available-for-sale securities, Five to Ten Years | 7,197 |
Available-for-sale, Estimated Fair Value | 40,040 | 37,258
Total held-to-maturity securities, One to Five Years | 10,913 |
Total held-to-maturity securities, Five to Ten Years | 23,799 |
Held-to-maturity securities, Fair value | $ 34,712 | $ 32,630

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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
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