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Investment Securities - Analysis of Amortized Cost and Estimated Fair Values of Securities Available for Sale (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Investment Securities [Line Items] |  |  |
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis |  | $ 5,600 |
Amortized Cost |  | 805,116 | $ 891,111
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 17,187 | 11,926
Gross Unrealized Losses |  | (8,644) | (16,477)
Securities available for sale, at fair value |  | 813,659 | 886,560
Due within one year, Estimated Fair Value |  | 5,602 |
Due after one but within five years, Amortized Cost |  | 17,697 |
Due after one but within five years, Estimated Fair Value |  | 17,756 |
Due after five but within ten years, Amortized Cost |  | 27,073 |
Due after five but within ten years, Estimated Fair Value |  | 27,951 |
Due after ten years, Amortized Cost |  | 44,924 |
Due after ten years, Estimated Fair Value |  | 38,077 |
Due within one year, Amortized Cost |  | 95,294 |
Available-for-sale Securities, Debt Maturities, Single Maturity Date |  | 89,386 |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis | [1] | 708,152 |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value | [1] | 722,603 |
US Government Agencies Residential Mortgage-backed Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 16,059 |
Securities available for sale, at fair value |  | 17,976 | 22,092
Residential Mortgage Backed Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Securities available for sale, at fair value |  | 704,626 | 777,577
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member] |  |  |
Investment Securities [Line Items] |  |  |
Securities available for sale, at fair value |  | 1 | 28
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member] |  |  |
Investment Securities [Line Items] |  |  |
Securities available for sale, at fair value |  | 19,307 | 19,118
Obligations of States and Political Subdivisions [Member] |  |  |
Investment Securities [Line Items] |  |  |
Securities available for sale, at fair value |  | 27,951 | 27,598
Corporate Debt Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Securities available for sale, at fair value |  | 6,519 | 2,319
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |
Investment Securities [Line Items] |  |  |
Securities available for sale, at fair value |  | 35,609 | 35,658
Debt Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 803,446 |
Securities available for sale, at fair value |  | 811,989 |
Equity Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 1,670 | 2,170
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0 | 0
Gross Unrealized Losses |  | 0 | 0
Securities available for sale, at fair value |  | 1,670 | 2,170
Debt Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 803,446 | 888,941
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 17,187 | 11,926
Gross Unrealized Losses |  | (8,644) | (16,477)
Securities available for sale, at fair value |  | 811,989 | 884,390
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 43,020 | 42,239
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 677 | 916
Gross Unrealized Losses |  | (8,088) | (7,497)
Securities available for sale, at fair value |  | 35,609 | 35,658
Corporate Debt Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 5,901 | 1,897
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 618 | 422
Gross Unrealized Losses |  | 0 | 0
Securities available for sale, at fair value |  | 6,519 | 2,319
Obligations of States and Political Subdivisions [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 27,073 | 27,066
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 878 | 532
Gross Unrealized Losses |  | 0 | 0
Securities available for sale, at fair value |  | 27,951 | 27,598
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 19,300 | 19,201
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 7 | 2
Gross Unrealized Losses |  | 0 | (85)
Securities available for sale, at fair value |  | 19,307 | 19,118
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 1 | 28
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0 | 0
Gross Unrealized Losses |  | 0 | 0
Securities available for sale, at fair value |  | 1 | 28
Residential Mortgage Backed Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 692,092 | 778,476
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 13,090 | 7,983
Gross Unrealized Losses |  | 556 | (8,882)
Securities available for sale, at fair value |  | 704,626 | 777,577
US Government Agencies Residential Mortgage-backed Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 16,059 | 20,034
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 1,917 | 2,071
Gross Unrealized Losses |  | 0 | (13)
Securities available for sale, at fair value |  | $ 17,976 | $ 22,092
[1] | Mortgage Backed Securities include an amortized cost of $16.1 million and a fair value of $18.0 million for Obligations of U.S.

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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