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Investment Securities - Analysis of Amortized Cost and Estimated Fair Values of Securities Available for Sale (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Investment Securities [Line Items] |  |  |
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis |  | $ 3,300 |
Amortized Cost |  | 842,333 | $ 790,082
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 7,242 | 7,076
Gross Unrealized Losses |  | (16,821) | (18,546)
Securities available for sale, at fair value |  | 832,754 | 778,612
Due within one year, Estimated Fair Value |  | 3,294 |
Due after one but within five years, Amortized Cost |  | 27,386 |
Due after one but within five years, Estimated Fair Value |  | 27,361 |
Due after five but within ten years, Amortized Cost |  | 27,077 |
Due after five but within ten years, Estimated Fair Value |  | 27,360 |
Due after ten years, Amortized Cost |  | 42,075 |
Due after ten years, Estimated Fair Value |  | 36,097 |
Due within one year, Amortized Cost |  | 99,838 |
Available-for-sale Securities, Debt Maturities, Single Maturity Date |  | 94,112 |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis | [1] | 740,825 |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value | [1] | 736,972 |
US Government Agencies Residential Mortgage-backed Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 14,600 |
Securities available for sale, at fair value |  | 16,018 | 16,617
Residential Mortgage Backed Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Securities available for sale, at fair value |  | 720,954 | 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 |  | 16,642 | 16,631
Obligations of States and Political Subdivisions [Member] |  |  |
Investment Securities [Line Items] |  |  |
Securities available for sale, at fair value |  | 27,360 | 27,229
Corporate Debt Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Securities available for sale, at fair value |  | 16,369 | 6,319
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |
Investment Securities [Line Items] |  |  |
Securities available for sale, at fair value |  | 33,741 | 33,292
Debt Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 840,663 |
Securities available for sale, at fair value |  | 831,084 |
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 |  | 840,663 | 788,412
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 7,242 | 7,076
Gross Unrealized Losses |  | (16,821) | (18,546)
Securities available for sale, at fair value |  | 831,084 | 776,942
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 40,165 | 39,989
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 530 | 427
Gross Unrealized Losses |  | (6,954) | (7,124)
Securities available for sale, at fair value |  | 33,741 | 33,292
Corporate Debt Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 15,896 | 5,903
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 476 | 416
Gross Unrealized Losses |  | (3) | 0
Securities available for sale, at fair value |  | 16,369 | 6,319
Obligations of States and Political Subdivisions [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 27,077 | 27,075
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 283 | 195
Gross Unrealized Losses |  | 0 | (41)
Securities available for sale, at fair value |  | 27,360 | 27,229
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 16,700 | 16,700
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0 | 0
Gross Unrealized Losses |  | (58) | (69)
Securities available for sale, at fair value |  | 16,642 | 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 |  | 726,240 | 683,601
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 4,513 | 4,557
Gross Unrealized Losses |  | (9,799) | (11,305)
Securities available for sale, at fair value |  | 720,954 | 676,853
US Government Agencies Residential Mortgage-backed Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost |  | 14,585 | 15,143
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax |  | 1,440 | 1,481
Gross Unrealized Losses |  | (7) | (7)
Securities available for sale, at fair value |  | $ 16,018 | $ 16,617
[1] | Mortgage-Backed Securities include an amortized cost of $14.6 million and a fair value of $16.0 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=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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