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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities Available for Sale (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Net Investment Income [Line Items] |  |  |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value |  | $ 48,357 |
Due after five but within ten years, Amortized Cost |  | 26,339 |
Due after one but within five years, Amortized Cost |  | 15,728 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | [1] | 822,394 |
Due within one year, Amortized Cost |  | 48,089 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost |  | 4,099 |
Due after ten years, Amortized Cost |  | 1,923 |
Corporate/Mortgage-Backed Securities, Amortized cost | [1] | 801,216 |
Amortized Cost |  | 872,153 | $ 740,846
Due within one year, Estimated Fair Value |  | 4,078 |
Due after one but within five years, Estimated Fair Value |  | 15,443 |
Due after five but within ten years, Estimated Fair Value |  | 26,416 |
Due after ten years, Estimated Fair Value |  | 2,420 |
Securities available for sale, at fair value |  | 851,243 | 731,358
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 2,573 | 4,854
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 23,483 | 14,342
Debt Securities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Amortized Cost |  | 870,483 | 739,176
Securities available for sale, at fair value |  | 849,573 | 729,688
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 2,573 | 4,854
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 23,483 | 14,342
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Amortized Cost |  | 690,700 |
Securities available for sale, at fair value |  | 670,800 |
Debt Securities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Amortized Cost |  | 870,483 |
Securities available for sale, at fair value |  | 849,573 |
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Securities available for sale, at fair value |  |  | 23,646
Corporate Debt Securities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Securities available for sale, at fair value |  | 21,089 | 16,493
Obligations of States and Political Subdivisions [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Securities available for sale, at fair value |  | 27,168 | 27,410
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Securities available for sale, at fair value |  | 100 | 1,097
Residential Mortgage Backed Securities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Securities available for sale, at fair value |  | 670,752 | $ 625,555
US Government Agencies Debt Securities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Amortized Cost |  | 131,700 |
Securities available for sale, at fair value |  | $ 130,400 |
[1] | Mortgage-Backed Securities include an amortized cost of $131.7 million and a fair value of $130.4 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $690.7 million and a fair value of $670.8 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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