Subordinated Notes (Details) - MFC Capital Trust II [Member] - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 19, 2003
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Principal asset of the trust of junior subordinate debt securities	$ 5,200,000
Trust-Preferred Securities [Member]
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Trust-preferred securities issued		$ 5,000,000
Pooled underwriting total		$ 344,000,000
Weighted-average interest rate (as a percent)	3.54%
Mandatory redemption date	Jan. 23, 2034
Percentage Tier 1 capital covered by trust preferred securities, maximum (as a percent)	25.00%
Trust-Preferred Securities [Member] | Minimum [Member]
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Interest rate (as a percent)	3.17%
Trust-Preferred Securities [Member] | Maximum [Member]
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Interest rate (as a percent)	3.74%