Parent Company Financial Statements (Schedule Of Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Other assets	$ 202,496	$ 228,118
Total assets	23,387,205	22,609,903	$ 11,632,603
Other liabilities	280,642	269,592
Junior subordinated debentures, at fair value	255,457	249,294
Junior subordinated debentures, at amortized cost	101,254	101,576
Total liabilities	19,537,871	18,832,277
Shareholders' equity	3,849,334	3,777,626
Total liabilities and shareholders' equity	23,387,205	22,609,903
Umpqua Bank [Member]
Condensed Financial Statements, Captions [Line Items]
Non-interest bearing deposits with subsidiary bank	91,354	102,102
Investments in Bank subsidiary	4,132,630	4,050,917
Investments In Nonbank subsidiaries	44,976	38,776
Other assets	3,742	4,079
Total assets	4,272,702	4,195,874
Payable to bank subsidiary	36	33
Other liabilities	66,621	67,345
Junior subordinated debentures, at fair value	255,457	249,294
Junior subordinated debentures, at amortized cost	101,254	101,576
Total liabilities	423,368	418,248
Shareholders' equity	3,849,334	3,777,626
Total liabilities and shareholders' equity	$ 4,272,702	$ 4,195,874