Business Combinations (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended		0 Months Ended	3 Months Ended				9 Months Ended				0 Months Ended			0 Months Ended			3 Months Ended	9 Months Ended
	Sep. 11, 2013	Sep. 30, 2013 operating_location	Sep. 30, 2012	Sep. 30, 2013 operating_location	Sep. 30, 2012	Dec. 31, 2012	Sep. 11, 2013 ProposedAcquisition [Member]	Jul. 02, 2013 Financial Pacific Holding Corp [Member]	Sep. 30, 2013 Financial Pacific Holding Corp [Member]		Sep. 30, 2012 Financial Pacific Holding Corp [Member]		Sep. 30, 2013 Financial Pacific Holding Corp [Member]		Sep. 30, 2012 Financial Pacific Holding Corp [Member]		Oct. 02, 2013 Financial Pacific Holding Corp [Member] Subsequent Event [Member]	Jul. 02, 2013 Financial Pacific Holding Corp [Member] Subsequent Event [Member]	Sep. 30, 2013 Financial Pacific Holding Corp [Member] Subsequent Event [Member]	Oct. 02, 2013 Financial Pacific Holding Corp [Member] Subsequent Event [Member] Minimum [Member]	Oct. 02, 2013 Financial Pacific Holding Corp [Member] Subsequent Event [Member] Maximum [Member]	Nov. 14, 2012 Circle Bancorp [Member]	Sep. 30, 2013 Circle Bancorp [Member] operating_location	Sep. 30, 2013 Circle Bancorp [Member] operating_location
Business Acquisition [Line Items]
Stock Issued During Period, Shares, Acquisitions	1.671
Cash Paid Acquisition, Per Share							$ 2.18
Payments to Acquire Businesses, Net of Cash Acquired				$ 149,658,000	$ 0
FeeOnTerminationOfMergerTransaction				75,000,000
Aggregate consideration to acquire entity																	158,000,000
Cash consideration to acquire entity								156,110,000										156,110,000				24,860,000
Equity consideration to acquire entity																	1,900,000
Vesting period of equity consideration																				2 years	3 years
Tax deductible goodwill																			0
Merger related expenses		4,856,000	85,000	7,197,000	338,000				629,000				1,424,000										32,000	981,000
Number of locations in operation		206		206																			6	6
Goodwill								96,994,000														11,922,000
Revenues													14,800,000										4,200,000	13,300,000
Non-interest expense		95,604,000	86,974,000	269,297,000	261,606,000				3,496,000	[1]	3,836,000	[2]	11,784,000	[3]	11,545,000	[4]							1,300,000	5,200,000
Net income (loss)		$ 23,477,000	$ 25,153,000	$ 73,091,000	$ 73,933,000	$ 101,891,000			$ 5,952,000	[1]	$ 4,002,000	[2]	$ 15,395,000	[3]	$ 11,759,000	[4]							$ 1,700,000	$ 4,500,000

[1] FinPac amounts represent results from July 1, 2013 to September 30, 2013.

[2] FinPac amounts represent results from July 1, 2012 to September 30, 2012.

[3] FinPac amounts represent results from January 1, 2013 to September 30, 2013.

[4] FinPac amounts represent results from January 1, 2012 to September 30, 2012.