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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities Available for Sale (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Net Investment Income [Line Items] |  |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date |  | $ 79,818 |
Due after five but within ten years, Amortized Cost |  | 27,081 |
Due after one but within five years, Amortized Cost |  | 14,088 |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis | [1] | 698,530 |
Due within one year, Amortized Cost |  | 84,675 |
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis |  | 997 |
Due after ten years, Amortized Cost |  | 42,509 |
Corporate/Mortgage-Backed Securities, Amortized cost | [1] | 697,156 |
Amortized Cost |  | 784,875 | $ 790,082
Due within one year, Estimated Fair Value |  | 997 |
Due after one but within five years, Estimated Fair Value |  | 14,214 |
Due after five but within ten years, Estimated Fair Value |  | 27,515 |
Due after ten years, Estimated Fair Value |  | 37,092 |
Total Debt Securities, Estimated Fair Value |  | 778,644 | 778,612
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 7,051 | 7,076
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | 13,282 | 18,546
Debt Securities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Amortized Cost |  | 783,205 | 788,412
Total Debt Securities, Estimated Fair Value |  | 776,974 | 776,942
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 7,051 | 7,076
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | 13,282 | 18,546
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Amortized Cost |  | 662,900 |
Total Debt Securities, Estimated Fair Value |  | 660,800 |
Debt Securities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Amortized Cost |  | 783,205 |
Total Debt Securities, Estimated Fair Value |  | 776,974 |
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Total Debt Securities, Estimated Fair Value |  | 34,629 | 33,292
Corporate Debt Securities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Total Debt Securities, Estimated Fair Value |  | 16,578 | 6,319
Obligations of States and Political Subdivisions [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Total Debt Securities, Estimated Fair Value |  | 27,514 | 27,229
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Total Debt Securities, Estimated Fair Value |  | 1,097 | 16,631
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Total Debt Securities, Estimated Fair Value |  | 0 | 1
Residential Mortgage Backed Securities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Total Debt Securities, Estimated Fair Value |  | 660,771 | $ 676,853
US Government Agencies Debt Securities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Amortized Cost |  | 35,700 |
Total Debt Securities, Estimated Fair Value |  | $ 36,385 |
[1] | Mortgage-Backed Securities include an amortized cost of $35.7 million and a fair value of $36.4 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=73527792&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=73527792&loc=d3e27161-111563 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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