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STOCKHOLDERS' EQUITY - Exchange offer with respect to Series A through E preferred stock (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Class Of Stock [Line Items] |  |  |
Liquidation value per share |  | $ 25 |
Preferred stock, shares outstanding |  | 1,444,146 | 1,444,146
Preferred Stock Value |  | $ 36,104 | $ 36,104
Shares of common stock issued | 852,831 |  |
7.125% Noncumulative Perpetual Monthly Income Preferred Stock, Series A [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Preferred stock dividend rate percentage |  | 7.125% |
8.35% Noncumulative Perpetual Monthly Income Preferred Stock, Series B [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Preferred stock dividend rate percentage |  | 8.35% |
7.40% Noncumulative Perpetual Monthly Income Preferred Stock, Series C [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Preferred stock dividend rate percentage |  | 7.40% |
7.25% Noncumulative Perpetual Monthly Income Preferred Stock, Series D [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Preferred stock dividend rate percentage |  | 7.25% |
7.00% Noncumulative Perpetual Monthly Income Preferred Stock, Series E [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Preferred stock dividend rate percentage |  | 7.00% |

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- Definition The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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