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Amortized Cost and Aggregate Fair Value of Available-For-Sale Securities, Including Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 372,389 | $ 332,942
Available for sale, Unrealized Gains | 4,355 | 5,432
Available for sale, Unrealized Losses | (10,571) | (12,257)
Available for sale, Fair Value | 366,173 | 326,117
U.S. Agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 31,414 | 34,604
Available for sale, Unrealized Gains | 39 | 11
Available for sale, Unrealized Losses | (751) | (1,017)
Available for sale, Fair Value | 30,702 | 33,598
Single Issue Trust Preferred Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 55,882 | 55,822
Available for sale, Unrealized Losses | (8,050) | (9,685)
Available for sale, Fair Value | 47,832 | 46,137
Corporate securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 70,571 | 5,000
Available for sale, Unrealized Gains |  | 109
Available for sale, Unrealized Losses | (238) |
Available for sale, Fair Value | 70,333 | 5,109
Mortgage-backed Agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 84,576 | 102,506
Available for sale, Unrealized Gains | 155 | 470
Available for sale, Unrealized Losses | (1,175) | (857)
Available for sale, Fair Value | 83,556 | 102,119
Equity Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 66 | 226
Available for sale, Unrealized Gains | 6 | 19
Available for sale, Unrealized Losses |  | (6)
Available for sale, Fair Value | 72 | 239
Municipal securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 124,880 | 134,784
Available for sale, Unrealized Gains | 4,155 | 4,823
Available for sale, Unrealized Losses | (357) | (692)
Available for sale, Fair Value | 128,678 | $ 138,915
Certificates of deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 5,000 |
Available for sale, Fair Value | $ 5,000 |

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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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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity 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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