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Intangible Assets - Servicing Assets (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 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 | Sep. 30, 2014 Minimum | Dec. 31, 2013 Minimum | Sep. 30, 2014 Maximum | Dec. 31, 2013 Maximum | Sep. 30, 2014 Foster Bankshares Inc | Sep. 30, 2013 Foster Bankshares Inc | Sep. 30, 2014 Foster Bankshares Inc | Sep. 30, 2013 Foster Bankshares 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.
Servicing Asset at Amortized Cost, Balance [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ 9,024 | $ 8,078 | $ 8,915 | $ 6,260 |  |  |  |  |  |  |  |  |  |  |  |
Additions through originations of servicing assets | 1,270 | 977 | 2,943 | 2,535 |  |  |  |  |  |  |  |  |  |  |  |
Additions through acquisition of PIB |  |  |  |  |  |  |  |  | 0 | 162 | 0 | 162 | 0 | 0 | 0 | 1,102
Amortization | (771) | (555) | (2,335) | (1,397) |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of period | $ 9,523 | $ 8,662 | $ 9,523 | $ 8,662 |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average discount rate |  |  |  |  | 5.47% | 5.49% | 5.73% | 5.73% |  |  |  |  |  |  |  |
Constant prepayment rate |  |  |  |  | 8.90% | 9.20% | 12.50% | 13.00% |  |  |  |  |  |  |  |

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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7524895&loc=d3e120260-111741 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
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