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Business Combinations - Additional Information (Details) (USD $)	3 Months Ended		9 Months Ended			0 Months Ended	3 Months Ended		9 Months Ended				0 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Aug. 13, 2013 Foster Bankshares Inc	Sep. 30, 2014 Foster Bankshares Inc	Sep. 30, 2013 Foster Bankshares Inc	Sep. 30, 2014 Foster Bankshares Inc	Sep. 30, 2013 Foster Bankshares Inc	Aug. 13, 2013 Foster Bankshares Inc Illinois bank_location	Aug. 13, 2013 Foster Bankshares Inc Virginia bank_location	Feb. 15, 2013 Pacific International Bancorp, Inc.	Sep. 30, 2014 Pacific International Bancorp, Inc.	Sep. 30, 2013 Pacific International Bancorp, Inc.	Sep. 30, 2014 Pacific International Bancorp, Inc.	Sep. 30, 2013 Pacific International Bancorp, Inc.	Sep. 30, 2014 Foster Bankshares, Inc and Pacific International Bancorp, Inc.	Sep. 30, 2013 Foster Bankshares, Inc and Pacific International Bancorp, Inc.	Sep. 30, 2014 Foster Bankshares, Inc and Pacific International Bancorp, Inc.	Sep. 30, 2013 Foster Bankshares, Inc and Pacific International Bancorp, Inc.	Sep. 30, 2014 Exchanged For Shares Of Company Foster Bankshares Inc	Sep. 30, 2014 Purchased For Cash Foster Bankshares Inc	Sep. 30, 2014 Not Redeemed Foster Bankshares Inc
Business Acquisition [Line Items]
Business combination, number of acquired bank branches											8	1
Business acquisition share price						$ 34.6703
Conversion shares per share of acquiree						2.62771
Shares issued									183,269
Number of shares of acquiree																						69,749	58,906	3,345
Cash paid						$ 2,042,000							$ 1,000
Goodwill	105,401,000		105,401,000		105,401,000	15,525,000							118,000
Outstanding principal balances of acquired loans							197,600,000		197,600,000					78,300,000		78,300,000
Carrying amount of acquired loans							167,200,000		167,200,000					71,000,000		71,000,000
Merger and integration expense	$ 66,000	$ 931,000	$ 290,000	$ 2,621,000			$ 66,000	$ 1,206,000	$ 259,000	$ 1,564,000				$ 0	$ (275,000)	$ 31,000	$ 1,057,000	$ 66,000	$ 931,000	$ 290,000	$ 2,621,000

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Business Acquisition Number of Shares of Acquiree

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Business Combination, Acquired Receivables, Loans, Carrying Amount

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Business Combination, Acquired Receivables, Loans, Outstanding Principal Balance

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Business Combination, Number of Acquired Bank Branches

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Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The number of shares issued as [noncash or part noncash] consideration for a business or asset acquired. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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