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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 | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 386,197 | $ 332,942
Unrealized Gains | 4,558 | 5,432
Unrealized Losses | (8,543) | (12,257)
Fair Value | 382,212 | 326,117
U.S. Agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 32,173 | 34,604
Unrealized Gains | 80 | 11
Unrealized Losses | (577) | (1,017)
Fair Value | 31,676 | 33,598
Single Issue Trust Preferred Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 55,867 | 55,822
Unrealized Losses | (6,433) | (9,685)
Fair Value | 49,434 | 46,137
Corporate securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 70,798 | 5,000
Unrealized Gains |  | 109
Unrealized Losses | (144) |
Fair Value | 70,654 | 5,109
Mortgage-backed Agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 94,432 | 102,506
Unrealized Gains | 427 | 470
Unrealized Losses | (734) | (857)
Fair Value | 94,125 | 102,119
Equity Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 222 | 226
Unrealized Gains | 13 | 19
Unrealized Losses |  | (6)
Fair Value | 235 | 239
Municipal securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 127,705 | 134,784
Unrealized Gains | 4,038 | 4,823
Unrealized Losses | (655) | (692)
Fair Value | 131,088 | $ 138,915
Certificates of deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 5,000 |
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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