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Investment Securities - Analysis of Amortized Cost and Estimated Fair Values of Securities Available for Sale (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Investment Securities [Line Items] |  |  |
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis |  | $ 996 |
Amortized Cost |  | 794,075 | $ 790,082
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 7,434 | 7,076
Gross Unrealized Losses |  | (15,263) | (18,546)
Securities available for sale, at fair value |  | 786,246 | 778,612
Due within one year, Estimated Fair Value |  | 997 |
Due after one but within five years, Amortized Cost |  | 14,087 |
Due after one but within five years, Estimated Fair Value |  | 14,176 |
Due after five but within ten years, Amortized Cost |  | 27,079 |
Due after five but within ten years, Estimated Fair Value |  | 27,555 |
Due after ten years, Amortized Cost |  | 42,290 |
Due after ten years, Estimated Fair Value |  | 35,975 |
Due within one year, Amortized Cost |  | 84,452 |
Available-for-sale Securities, Debt Maturities, Single Maturity Date |  | 78,703 |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis | [1] | 707,953 |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value | [1] | 705,873 |
US Government Agencies Residential Mortgage-backed Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 13,800 |
Securities available for sale, at fair value |  | 15,184 | 16,617
Residential Mortgage Backed Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Securities available for sale, at fair value |  | 690,689 | 676,853
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member] |  |  |
Investment Securities [Line Items] |  |  |
Securities available for sale, at fair value |  | 0 | 1
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member] |  |  |
Investment Securities [Line Items] |  |  |
Securities available for sale, at fair value |  | 1,096 | 16,631
Obligations of States and Political Subdivisions [Member] |  |  |
Investment Securities [Line Items] |  |  |
Securities available for sale, at fair value |  | 27,555 | 27,229
Corporate Debt Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Securities available for sale, at fair value |  | 16,404 | 6,319
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |
Investment Securities [Line Items] |  |  |
Securities available for sale, at fair value |  | 33,648 | 33,292
Debt Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 792,405 |
Securities available for sale, at fair value |  | 784,576 |
Equity Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 1,670 | 1,670
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 | 1,670
Debt Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 792,405 | 788,412
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 7,434 | 7,076
Gross Unrealized Losses |  | (15,263) | (18,546)
Securities available for sale, at fair value |  | 784,576 | 776,942
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 40,378 | 39,989
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 463 | 427
Gross Unrealized Losses |  | (7,193) | (7,124)
Securities available for sale, at fair value |  | 33,648 | 33,292
Corporate Debt Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 15,899 | 5,903
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 505 | 416
Gross Unrealized Losses |  | 0 | 0
Securities available for sale, at fair value |  | 16,404 | 6,319
Obligations of States and Political Subdivisions [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 27,079 | 27,075
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 476 | 195
Gross Unrealized Losses |  | 0 | (41)
Securities available for sale, at fair value |  | 27,555 | 27,229
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 1,096 | 16,700
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0 | 0
Gross Unrealized Losses |  | 0 | (69)
Securities available for sale, at fair value |  | 1,096 | 16,631
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 0 | 1
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 |  | 0 | 1
Residential Mortgage Backed Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 694,114 | 683,601
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 4,638 | 4,557
Gross Unrealized Losses |  | (8,063) | (11,305)
Securities available for sale, at fair value |  | 690,689 | 676,853
US Government Agencies Residential Mortgage-backed Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 13,839 | 15,143
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 1,352 | 1,481
Gross Unrealized Losses |  | (7) | (7)
Securities available for sale, at fair value |  | $ 15,184 | $ 16,617
[1] | Mortgage-Backed Securities include an amortized cost of $13.8 million and a fair value of $15.2 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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