Goodwill, Intangible and Other Assets - Summary of Commitment to Invest in Low Income Housing Partnerships (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Other Commitments [Line Items]
Original commitment amount	$ 30,693
Less: life to date contributions	(13,422)
Remaining commitment amount	17,271
R4 - MVV
Other Commitments [Line Items]
Years over which tax credits are earned	17 years
Original commitment amount	8,518
Less: life to date contributions	(804)
Remaining commitment amount	7,714
R4 - Coronado
Other Commitments [Line Items]
Years over which tax credits are earned	17 years
Original commitment amount	10,675
Less: life to date contributions	(1,686)
Remaining commitment amount	8,989
WNC
Other Commitments [Line Items]
Years over which tax credits are earned	16 years
Original commitment amount	2,500
Less: life to date contributions	(1,932)
Remaining commitment amount	568
USA 57
Other Commitments [Line Items]
Years over which tax credits are earned	15 years
Original commitment amount	3,000
Less: life to date contributions	(3,000)
Remaining commitment amount	0
Centerline XXXIII
Other Commitments [Line Items]
Years over which tax credits are earned	18 years
Original commitment amount	3,000
Less: life to date contributions	(3,000)
Remaining commitment amount	0
Centerline XXII
Other Commitments [Line Items]
Years over which tax credits are earned	18 years
Original commitment amount	3,000
Less: life to date contributions	(3,000)
Remaining commitment amount	$ 0