Employee Benefit Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended			6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2011 Supplemental Executive Retirement Plan ("SERP")	Jun. 30, 2012 Supplemental Executive Retirement Plan ("SERP") person	Jun. 30, 2011 Supplemental Executive Retirement Plan ("SERP")	Mar. 14, 2012 Supplemental Executive Retirement Plan ("SERP")	Jun. 30, 2012 Supplemental Executive Retirement Plan ("SERP") for former executives of the Pacific Bank person	Jun. 30, 2011 Supplemental Executive Retirement Plan ("SERP") for former executives of the Pacific Bank
Employee Benefit Plans
Maximum contribution by employee (as a percent)			50.00%
Percentage of employer contribution of first 6 percent of covered compensation			50.00%
Maximum employee contribution matched by employer as a percentage of covered compensation			6.00%
Profit sharing and matching contribution expense	$ 4.8	$ 4.5	$ 9.4	$ 9.0
Percentage of incentive compensation	100.00%		100.00%
Net deferred compensation expense	0.3	0.3	0.4	0.4
Supplemental Executive Retirement Plan ("SERP"):
Number of executives (in persons)						1			3
Number of units converted into the deferred compensation stock fund								167,423
Deferred compensation stock fund in equity								8.3
Pension expense					0.2	1.9	0.5		0.1	0.3
Unfunded pension liability								8.3	2.3
Pension expense from conversion of fully vested interest into the deferred compensation stock fund in equity						$ 1.7