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Acquisition of Visalia Community Bank - Summary of consideration paid, assets acquired and liabilities assumed (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended
	Jul. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Goodwill		$ 29,917us-gaap_Goodwill	$ 29,917us-gaap_Goodwill	$ 23,577us-gaap_Goodwill
Visalia Community Bank [Member]
Business Acquisition [Line Items]
Cash	11,050
Common stock issued	12,727
Fair Value of Total Consideration Transferred	23,777
Cash and cash equivalents	51,985
Loans, net	113,467
Investments	14,818
Core deposit intangible	1,365
Premises and equipment	4,263
Federal Home Loan Bank stock	698
Other real estate owned	263
Deferred taxes and taxes receivable	3,179
Bank owned life insurance	6,786
Other assets	797
Total assets acquired	197,621
Deposits	174,206
Other liabilities	5,978
Total liabilities assumed	180,184
Total identifiable net assets	17,437
Goodwill	$ 6,340