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Long-Term Debt (Details Textual) - USD ($) |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jul. 01, 2017 | Feb. 22, 2017 | Aug. 22, 2016 | Mar. 17, 2014 | Mar. 31, 2012 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2007 | Dec. 31, 2005 | Dec. 31, 2003
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unused lines of credit |  |  |  |  |  | $ 2,670,141,000 |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  | 205,000 | $ 2,539,000 | $ 0 |  |  |
Subordinated notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Par percentage |  |  | 100.00% |  |  |  |  |  |  |  |
Redemption price percentage |  |  | 100.00% |  |  |  |  |  |  |  |
PHC Statutory Trust I |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate (percent) |  |  |  | 5.49% |  |  |  |  |  |  |
Heritage Financial Statutory Trust I | Subordinated notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redemption of debenture |  | $ 10,515,000 |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | 10,310,000 |  |  |  |  |  |  |  |  |
Prepayment penalty |  | $ 205,000 |  |  |  |  |  |  |  |  |
Capital Bancorp Capital Trust I |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate (percent) |  |  |  |  | 4.42% |  |  |  |  |  |
Junior subordinated notes |  |  |  |  |  | 83,003,000 |  |  |  |  |
First M&F Statutory Trust I |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Junior subordinated notes |  |  |  |  |  | $ 9,997,000 | 10,545,000 |  |  |  |
Interest rate of senior note (percent) |  |  |  |  |  | 3.795% |  |  |  |  |
5.00% Subordinated Notes due 2026 | Subordinated notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate of senior note (percent) |  |  | 5.00% |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 60,000,000 |  |  |  |  |  |  |  |
5.50% Subordinated Notes due 2031 | Subordinated notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate of senior note (percent) |  |  | 5.50% |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 40,000,000 |  |  |  |  |  |  |  |
Metropolitan Notes | Subordinated notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate of senior note (percent) | 6.50% |  |  |  |  |  |  |  |  |  |
Borrowings | $ 15,000,000 |  |  |  |  |  |  |  |  |  |
LIBOR | PHC Statutory Trust I |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  |  | 2.85% |  |  |  |  |  |  | 285.00%
LIBOR | PHC Statutory Trust II |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  |  |  |  |  |  |  |  | 187.00% |
LIBOR | Capital Bancorp Capital Trust I |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  |  |  | 1.50% |  |  |  | 150.00% |  |
LIBOR | First M&F Statutory Trust I |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  |  |  |  | 133.00% |  |  |  |  |
LIBOR | 5.00% Subordinated Notes due 2026 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  |  |  |  |  |  |  | 384.00% |  |
LIBOR | 5.50% Subordinated Notes due 2031 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  |  |  |  |  |  |  | 407.10% |  |
LIBOR | Metropolitan Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (percent) | 554.50% |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt, amount |  |  |  |  |  | $ 0 | 42,369,000 | $ 0 |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  | $ 2,539,000 |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maturity period of Long-term advances, earliest |  |  |  |  |  | 2018 |  |  |  |  |
Long-term advances, interest rates (percent) |  |  |  |  |  | 1.09% |  |  |  |  |
Minimum | LIBOR | 5.00% Subordinated Notes due 2026 | Subordinated notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Variable rate threshold |  |  | 0.00% |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maturity period of Long-term advances, new |  |  |  |  |  | 2030 |  |  |  |  |
Long-term advances, interest rates (percent) |  |  |  |  |  | 6.46% |  |  |  |  |
Weighted Average |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term advances, interest rates (percent) |  |  |  |  |  | 3.33% | 3.47% |  |  |  |

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- Definition The cash outflow from the repayment of long-term borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in case of liquidation of the entity's assets before its maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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