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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities Available for Sale (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Net Investment Income [Line Items] |  |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date |  | $ 63,617 |
Due after five but within ten years, Amortized Cost |  | 26,337 |
Due after one but within five years, Amortized Cost |  | 15,727 |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis | [1] | 764,832 |
Due within one year, Amortized Cost |  | 62,686 |
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis |  | 5,099 |
Due after ten years, Amortized Cost |  | 15,523 |
Corporate/Mortgage-Backed Securities, Amortized cost | [1] | 747,590 |
Amortized Cost |  | 829,188 | $ 740,846
Due within one year, Estimated Fair Value |  | 5,073 |
Due after one but within five years, Estimated Fair Value |  | 15,541 |
Due after five but within ten years, Estimated Fair Value |  | 26,409 |
Due after ten years, Estimated Fair Value |  | 16,594 |
Total Debt Securities, Estimated Fair Value |  | 812,877 | 731,358
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 4,474 | 4,854
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | 20,785 | 14,342
Debt Securities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Amortized Cost |  | 827,518 | 739,176
Total Debt Securities, Estimated Fair Value |  | 811,207 | 729,688
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 4,474 | 4,854
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax |  | 20,785 | 14,342
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Amortized Cost |  | 681,300 |
Total Debt Securities, Estimated Fair Value |  | 664,800 |
Debt Securities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Amortized Cost |  | 827,518 |
Total Debt Securities, Estimated Fair Value |  | 811,207 |
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Total Debt Securities, Estimated Fair Value |  | 14,132 | 23,646
Corporate Debt Securities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Total Debt Securities, Estimated Fair Value |  | 21,226 | 16,493
Obligations of States and Political Subdivisions [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Total Debt Securities, Estimated Fair Value |  | 27,161 | 27,410
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Total Debt Securities, Estimated Fair Value |  | 1,098 | 1,097
Residential Mortgage Backed Securities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Total Debt Securities, Estimated Fair Value |  | 664,788 | $ 625,555
US Government Agencies Debt Securities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Amortized Cost |  | 83,500 |
Total Debt Securities, Estimated Fair Value |  | $ 82,800 |
[1] | Mortgage-Backed Securities include an amortized cost of $83.5 million and a fair value of $82.8 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=82897076&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=82897076&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=75030427&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=82897076&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=82896770&loc=d3e26610-111562 + Details
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