Loans and Leases (Accretable Yield Movement Schedule) (Details) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance, beginning of period	$ 201,699	$ 127,624
Additions		110,757
Accretion to interest income	(60,065)	(62,147)
Disposals	(32,586)	(32,466)
Reclassifications from nonaccretable difference	23,781	57,931
Balance, end of period	132,829	201,699
Evergreen Bank [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance, beginning of period	9,466	20,063
Additions		0
Accretion to interest income	(4,521)	(11,340)
Disposals	(3,642)	(5,457)
Reclassifications from nonaccretable difference	3,806	6,200
Balance, end of period	5,109	9,466
Rainer [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance, beginning of period	49,989	71,789
Additions		0
Accretion to interest income	(14,981)	(18,264)
Disposals	(6,689)	(11,217)
Reclassifications from nonaccretable difference	9,599	7,681
Balance, end of period	37,918	49,989
Nevada Security Bank [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance, beginning of period	23,666	34,632
Additions		0
Accretion to interest income	(8,445)	(13,791)
Disposals	(4,150)	(5,841)
Reclassifications from nonaccretable difference	2,853	8,666
Balance, end of period	13,924	23,666
Circle Bancorp [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance, beginning of period	796	1,140
Additions		0
Accretion to interest income	(262)	(344)
Disposals	(342)	0
Reclassifications from nonaccretable difference	37	0
Balance, end of period	229	796
Sterling Financial Corporation [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance, beginning of period	117,782	0
Additions		110,757
Accretion to interest income	(31,856)	(18,408)
Disposals	(17,763)	(9,951)
Reclassifications from nonaccretable difference	7,486	35,384
Balance, end of period	$ 75,649	$ 117,782