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Long-Term Debt (Details Textual) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 22, 2016 | Mar. 17, 2014 | Mar. 31, 2012 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2007 | Dec. 31, 2005 | Dec. 31, 2003 | Mar. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Unused lines of credit |  |  |  | $ 2,633,543,000 |  |  |  |  |  |
FHLB advances |  |  |  | 42,369,000 | $ 0 | $ 0 |  |  |  |
Prepayment penalties |  |  |  | $ 2,539,000 | $ 0 | $ 0 |  |  |  |
Subordinated notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Par percentage | 100.00% |  |  |  |  |  |  |  |  |
Proceeds from sale of notes | $ 98,167,000 |  |  |  |  |  |  |  |  |
Discount percentage | 1.50% |  |  |  |  |  |  |  |  |
Redemption price percentage | 100.00% |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity period of Long-term advances, earliest |  |  |  | 2018 |  |  |  |  |  |
Long-term advances, interest rates (percent) |  |  |  | 1.09% |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity period of Long-term advances, new |  |  |  | 2039 |  |  |  |  |  |
Long-term advances, interest rates (percent) |  |  |  | 6.46% |  |  |  |  |  |
Weighted Average |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term advances, interest rates (percent) |  |  |  | 3.47% | 4.06% |  |  |  |  |
PHC Statutory Trust I |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Fixed interest rate (percent) |  | 5.49% |  |  |  |  |  |  |  |
PHC Statutory Trust I | LIBOR |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  | 2.85% |  |  |  |  |  |  | 2.85% |
PHC Statutory Trust II | LIBOR |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  |  |  |  |  |  | 1.87% |  |
Heritage Financial Statutory Trust I |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate for Heritage Financial Statutory Trust I (percent) |  |  |  | 10.20% |  |  |  |  |  |
Capital Bancorp Capital Trust I |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Fixed interest rate (percent) |  |  |  |  |  |  |  |  |  | 4.42%
Junior subordinated notes |  |  |  | $ 92,455,000 |  |  |  |  |  |
Capital Bancorp Capital Trust I | LIBOR |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  | 1.50% |  |  |  | 1.50% |  |  |
First M&F Statutory Trust I |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate of senior note (percent) |  |  |  | 3.795% |  |  |  |  |  |
Junior subordinated notes |  |  |  | $ 10,545,000 | $ 11,093,000 |  |  |  |  |
First M&F Statutory Trust I | LIBOR |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  |  |  | 1.33% |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Redemption price percentage | 100.00% |  |  |  |  |  |  |  |  |
5.00% Subordinated Notes due 2026 | LIBOR | Subordinated notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (percent) | 3.84% |  |  |  |  |  |  |  |  |
5.00% Subordinated Notes due 2026 | LIBOR | Minimum | Subordinated notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Variable rate threshold | 0.00% |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Redemption price percentage | 100.00% |  |  |  |  |  |  |  |  |
5.50% Subordinated Notes due 2031 | LIBOR | Subordinated notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (percent) | 4.071% |  |  |  |  |  |  |  |  |
5.50% Subordinated Notes due 2031 | LIBOR | Minimum | Subordinated notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Variable rate threshold | 0.00% |  |  |  |  |  |  |  |  |

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- Definition Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(3)(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22 (b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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