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RELATED-PARTY TRANSACTIONS - Transactions Involving Underwriting Services (Details) - USD ($) $ / shares in Units, $ in Thousands | Oct. 27, 2016 | Mar. 08, 2016 | Feb. 08, 2016 | Jun. 30, 2018
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Related Party Transaction [Line Items] |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) |  |  |  | $ 1,000
Series E 7.00% non-cumulative perpetual |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Non cumulative preferred stock, dividend rate |  |  | 7.00% |
Underwritten Public Offering |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Depository shares issued (in shares) |  |  | 5,000,000 |
Offering price per share (in dollars per share) |  |  | $ 25 |
Underwritten Public Offering | Series E 7.00% non-cumulative perpetual |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Depository shares to preferred stock ratio |  |  | 2.50% |
Preferred stock, liquidation preference per share (in dollars per share) |  |  | $ 1,000 |
Underwritten Public Offering | Common Stock |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Issuance of stock shares (in shares) |  | 5,577,500 |  |
Director | Financial Advisory Services |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses from transactions with related parties | $ 516 |  |  |
Expenses from transactions with related parties, net of related expenses | $ 500 |  |  |
Director | Underwriting Fees |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses from transactions with related parties |  |  | $ 944 |
Expenses from transactions with related parties, net of related expenses |  |  | $ 849 |
Director | Underwriting Fees | Common Stock |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses from transactions with related parties |  | $ 1,000 |  |
Expenses from transactions with related parties, net of related expenses |  | $ 846 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644 + Details
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