Business Combinations (Consideration Transferred) (Details) (Washington Banking, USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended
	May 01, 2014
Business Acquisition [Line Items]
Cash paid	$ 42,895	[1]
Total consideration transferred	269,619
Business acquisition, number of shares issued	14,000,178
Fractional Shares
Business Acquisition [Line Items]
Cash paid	3	[1]
From Dissenters
Business Acquisition [Line Items]
Cash paid	27	[1]
Restricted Stock Units (RSUs)
Business Acquisition [Line Items]
Fair value of equity interest issued	2,092	[2]
Converted restricted stock award units	129,462
Number of shares surrendered at conversion	26,783
Restricted stock awards issued in merger, but surrendered to pay taxes	433
Stock Options
Business Acquisition [Line Items]
Fair value of equity interest issued	481
Common Stock
Business Acquisition [Line Items]
Fair value of equity interest issued	$ 224,151	[3]
Business acquisition, number of shares issued	13,870,716
Common Stock | Fractional Shares
Business Acquisition [Line Items]
Business acquisition, number of shares excluded from equity issued	165
Common Stock | From Dissenters
Business Acquisition [Line Items]
Business acquisition, number of shares excluded from equity issued	1,686

[1] Includes $3,000 of cash paid due to fractional shares and $27,000 of cash paid from dissenters.

[2] Total number of converted shares was 129,462. Fair value includes 26,783 shares which were forfeited by the Washington Banking stockholder to pay applicable taxes, totaling fair value of $433,000.

[3] Total of 13,870,716 shares issued. Excludes 1,686 shares dissented and paid in cash and 165 fractional shares paid in cash.