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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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