Goodwill and Intangibles (Details) (USD $)	3 Months Ended			9 Months Ended
	Jun. 30, 2013	Mar. 31, 2013		Sep. 30, 2013 Bond		Sep. 30, 2013 Core Deposit Intangible Assets [Member]	Dec. 31, 2012 Core Deposit Intangible Assets [Member]
Changes to carrying amount of goodwill [Roll Forward]
Goodwill, beginning of period		$ 42,781,000	[1]	$ 42,781,000	[1]
Adjustment to goodwill	(190,000)	(105,000)
Goodwill, end of period				42,486,000
Goodwill acquired during the year				415,000
Goodwill market value adjustment				254,000
Number of bonds held in investment portfolio at acquisition				2
Increase to income tax receivable from PSB acquisition				190,000
Net of deferred taxes adjustment resulted in reduction to goodwill				295,000
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount						11,674,000	11,674,000
Less accumulated amortization						(3,457,000)	(2,627,000)
Net carrying amount						$ 8,217,000	$ 9,047,000

[1] Derived from audited financial statements.