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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 |
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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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- Definition Business Acquisition Number of Shares of Acquiree + References No definition available. + Details
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- Definition Business Combination, Acquired Receivables, Loans, Carrying Amount + References No definition available. + Details
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- Definition Business Combination Cash In Lieu of Fractional Shares + References No definition available. + Details
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- Definition Business Combination, Number of Acquired Bank Branches + References No definition available. + Details
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- Definition Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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