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INCOME TAXES - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Computed expected income tax expense (benefit) at Federal statutory rate |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 34.00% |
Taxes payable | $ 637,000 |  |  |  | $ 56,000 |  |  |  | $ 637,000 | $ 56,000 |  |
Income tax receivable | 604,000 |  |  |  | 0 |  |  |  | 604,000 | 0 |  |
Section 382 limitation | 9,800,000 |  |  |  |  |  |  |  | 9,800,000 |  |  |
Valuation allowance | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |
Net deferred tax asset | 11,341,000 |  |  |  | 16,373,000 |  |  |  | 11,341,000 | 16,373,000 |  |
Income before income taxes | $ 30,966,000 | $ 23,799,000 | $ 27,403,000 | $ 22,098,000 | 4,841,000 | $ 12,150,000 | $ 8,535,000 | $ 940,000 | 104,266,000 | 26,466,000 | $ 7,908,000 |
Income before income taxes and net operating loss carryforward |  |  |  |  |  |  |  |  | 82,100,000 |  |  |
Income before income taxes and bargain purchase gain |  |  |  |  |  |  |  |  | $ 138,600,000 |  |  |
Percent of domestic and state operating loss carryforwards utilized | 31.00% |  |  |  |  |  |  |  | 31.00% |  |  |
Tax credit carryforward utilized |  |  |  |  |  |  |  |  | $ 632,000 |  |  |
Threshold amount on use of operating loss carryforwards in year 4 |  |  |  |  |  |  |  |  | 1,400,000 |  |  |
Threshold amount on use of operating loss carryforwards in year 5 and thereafter |  |  |  |  |  |  |  |  | 474,000 |  |  |
Unrecognized tax benefits | $ 0 |  |  |  | 5,421,000 |  |  |  | 0 | 5,421,000 | $ 2,203,000 | $ 0
Total unrecognized tax benefit that, if recognized, would impact the effective tax rate | 0 |  |  |  |  |  |  |  | 0 |  |  |
Accrued penalties and interest | 0 |  |  |  | $ 23,000 |  |  |  | 0 | $ 23,000 |  |
Beach Business Bank |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Section 382 limitation | 1,300,000 |  |  |  |  |  |  |  | 1,300,000 |  |  |
Gateway Bancorp |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Section 382 limitation | 474,000 |  |  |  |  |  |  |  | 474,000 |  |  |
Domestic Tax Authority |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating loss carryforwards | 3,800,000 |  |  |  |  |  |  |  | 3,800,000 |  |  |
Operating loss carryforward utilized |  |  |  |  |  |  |  |  | 474,000 |  |  |
State and Local Jurisdiction |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating loss carryforwards | $ 13,200,000 |  |  |  |  |  |  |  | 13,200,000 |  |  |
Operating loss carryforward utilized |  |  |  |  |  |  |  |  | $ 8,500,000 |  |  |

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, before jurisdictional netting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51673353&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + Details
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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 1, 5 -Article 9 + Details
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