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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities Available for Sale (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Net Investment Income [Line Items] |  |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date |  | $ 86,644 |
Due after five but within ten years, Amortized Cost |  | 27,068 |
Due after one but within five years, Amortized Cost |  | 20,596 |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis | [1] | 787,808 |
Due within one year, Amortized Cost |  | 94,665 |
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis |  | 2,601 |
Due after ten years, Amortized Cost |  | 44,400 |
Corporate/Mortgage-Backed Securities, Amortized cost | [1] | 801,348 |
Amortized Cost |  | 884,679 | $ 891,111
Due within one year, Estimated Fair Value |  | 2,601 |
Due after one but within five years, Estimated Fair Value |  | 20,640 |
Due after five but within ten years, Estimated Fair Value |  | 27,832 |
Due after ten years, Estimated Fair Value |  | 35,571 |
Total Debt Securities, Estimated Fair Value |  | 890,198 | 886,560
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 16,924 | 11,926
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | 11,405 | 16,477
US Government Agencies Debt Securities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Amortized Cost |  | 19,380 | 20,034
Total Debt Securities, Estimated Fair Value |  | 21,700 | 22,092
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 2,320 | 2,071
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0 | 13
Debt Securities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Amortized Cost |  | 882,473 | 888,941
Total Debt Securities, Estimated Fair Value |  | 887,992 | 884,390
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 16,924 | 11,926
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | 11,405 | 16,477
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Amortized Cost |  | 768,400 |
Total Debt Securities, Estimated Fair Value |  | 779,600 |
Debt Securities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Amortized Cost |  | 882,473 |
Total Debt Securities, Estimated Fair Value |  | 887,992 |
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Total Debt Securities, Estimated Fair Value |  | 33,273 | 35,658
Corporate Debt Securities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Total Debt Securities, Estimated Fair Value |  | 6,336 | 2,319
Obligations of States and Political Subdivisions [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Total Debt Securities, Estimated Fair Value |  | 27,832 | 27,598
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Total Debt Securities, Estimated Fair Value |  | 19,203 | 19,118
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Total Debt Securities, Estimated Fair Value |  | 23 | 28
Residential Mortgage Backed Securities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Total Debt Securities, Estimated Fair Value |  | 779,625 | 777,577
US Government Agencies Debt Securities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Amortized Cost |  | 19,380 |
Total Debt Securities, Estimated Fair Value |  | $ 21,700 | $ 22,092
[1] | Mortgage Backed Securities include an amortized cost of $19.4 million and a fair value of $21.7 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 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=51813488&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=27724398&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=49167202&loc=d3e26610-111562 + Details
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