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Business Combinations - Fair value of loans acquired and pro forma information (Details) (USD $) | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended | 3 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Foster Bankshares Inc | Aug. 12, 2013 Foster Bankshares Inc | Dec. 31, 2013 Foster Bankshares Inc Merger and integration expense | Dec. 31, 2013 Pacific International Bancorp, Inc. | Feb. 13, 2013 Pacific International Bancorp, Inc. | Dec. 31, 2013 Pacific International Bancorp, Inc. Merger and integration expense | Dec. 31, 2013 Foster Bankshares, Inc and Pacific International Bancorp, Inc. | Dec. 31, 2012 Foster Bankshares, Inc and Pacific International Bancorp, Inc.
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding principal balances on loans acquired |  |  |  | $ 279,700,000 |  |  | $ 126,000,000 |  |  |  |
Carrying amount related to outstanding principal balances acquired |  |  |  | 235,100,000 |  |  | 107,600,000 |  |  |  |
Acquisition-related expenses | 5,161,000 | 3,809,000 | 4,713,000 |  |  | 4,000,000 |  |  | 1,100,000 |  |
Fair value of loans acquired: |  |  |  |  |  |  |  |  |  |  |
Contractually required principal and interest at acquisition |  |  |  |  | 150,430,000 |  |  | 54,462,000 |  |  |
Contractual cash flows not expected to be collected (nonaccretable discount) |  |  |  |  | 37,447,000 |  |  | 9,687,000 |  |  |
Expected cash flows at acquisition |  |  |  |  | 112,983,000 |  |  | 44,775,000 |  |  |
Interest component of expected cash flows (accretable discount) |  |  |  |  | 14,928,000 |  |  | 4,945,000 |  |  |
Fair value of acquired impaired loans |  |  |  |  | 98,055,000 |  |  | 39,830,000 |  |  |
Pro forma: from the beginning of the period |  |  |  |  |  |  |  |  |  |  |
Net Interest Income |  |  |  |  |  |  |  |  |  | 264,040,000 | 264,669,000
Net income, pro forma |  |  |  |  |  |  |  |  |  | $ 84,304,000 | $ 74,949,000
Earnings per share - basic, pro forma |  |  |  |  |  |  |  |  |  | $ 1.07 | $ 0.88
Earnings per share - diluted, pro forma |  |  |  |  |  |  |  |  |  | $ 1.06 | $ 0.88

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + 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 The aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details
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- Definition Fair value at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition Amount of cash flows expected to be collected at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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