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Fair Value Option and Fair Value Measurements (Details 3) (USD $) In Thousands, unless otherwise specified |  |  |  |  |  |  |  |  |  |  |  | 6 Months Ended |  | 6 Months Ended |  |  |  |  | 6 Months Ended |  |
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Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 Level 3 | Dec. 31, 2013 Level 3 | Jun. 30, 2014 Asset-backed securities | Dec. 31, 2013 Asset-backed securities | Jun. 30, 2014 States and political subdivisions | Dec. 31, 2013 States and political subdivisions | Jun. 30, 2014 Recurring basis Level 3 | Dec. 31, 2013 Recurring basis Level 3 | Jun. 30, 2013 Recurring basis Interest rate swap agreements net of swap credit valuation Management estimate of credit risk exposure Level 3 | Jun. 30, 2013 Recurring basis Interest rate swap agreements net of swap credit valuation Management estimate of credit risk exposure Level 3 Minimum | Jun. 30, 2013 Recurring basis Interest rate swap agreements net of swap credit valuation Management estimate of credit risk exposure Level 3 Maximum | Jun. 30, 2013 Recurring basis Interest rate swap agreements net of swap credit valuation Management estimate of credit risk exposure Level 3 Weighted Average of Inputs | Jun. 30, 2013 Recurring basis Mortgage Servicing rights Discounted Cash Flow Level 3 | Jun. 30, 2014 Recurring basis Mortgage Servicing rights Discounted Cash Flow Level 3 | Jun. 30, 2014 Recurring basis Mortgage Servicing rights Discounted Cash Flow Level 3 Minimum | Jun. 30, 2014 Recurring basis Mortgage Servicing rights Discounted Cash Flow Level 3 Maximum | Jun. 30, 2014 Recurring basis Mortgage Servicing rights Discounted Cash Flow Level 3 Weighted Average of Inputs | Jun. 30, 2013 Recurring basis Mortgage Servicing rights Discounted Cash Flow Level 3 Weighted Average of Inputs | Jun. 30, 2014 Recurring basis Asset-backed securities Level 3 | Dec. 31, 2013 Recurring basis Asset-backed securities Level 3 | Jun. 30, 2014 Recurring basis Asset-backed securities Discounted Cash Flow Level 3 | Jun. 30, 2013 Recurring basis Asset-backed securities Discounted Cash Flow Level 3 | Jun. 30, 2014 Recurring basis Asset-backed securities Discounted Cash Flow Level 3 Minimum | Jun. 30, 2013 Recurring basis Asset-backed securities Discounted Cash Flow Level 3 Minimum | Jun. 30, 2014 Recurring basis Asset-backed securities Discounted Cash Flow Level 3 Maximum | Jun. 30, 2013 Recurring basis Asset-backed securities Discounted Cash Flow Level 3 Maximum | Jun. 30, 2014 Recurring basis Asset-backed securities Discounted Cash Flow Level 3 Weighted Average of Inputs | Jun. 30, 2013 Recurring basis Asset-backed securities Discounted Cash Flow Level 3 Weighted Average of Inputs | Jun. 30, 2014 Recurring basis States and political subdivisions Level 3 | Dec. 31, 2013 Recurring basis States and political subdivisions Level 3
Quantitative information about Level 3 fair value measurements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale | $ 329,814 | $ 372,191 | $ 137,211 | $ 154,262 | $ 246,437 | $ 273,203 | $ 15,753 | $ 16,794 |  |  |  |  |  |  |  |  |  |  |  |  | $ 137,086 | $ 154,137 |  |  |  |  |  |  |  |  | $ 125 | $ 125
Mortgage servicing rights, fair value | 5,501 | 5,807 |  |  |  |  |  |  | 5,501 | 5,807 |  |  |  |  | 5,807 | 5,501 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap valuation, fair value |  |  |  |  |  |  |  |  |  |  | (6) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 137,086 | $ 154,137 |  |  |  |  |  |  |  |
Discount rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.20% |  | 10.00% | 14.00% | 9.70% | 10.20% |  |  |  |  |  |  |  |  |  |  |  |
Prepayment speed (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.70% |  | 3.70% | 33.20% | 10.20% | 9.70% |  |  |  |  |  |  |  |  |  |  |  |
Credit risk rating & probability of default (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 5.00% | 20.00% | 12.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit risk premium (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% | 1.10% | 0.80% | 1.50% | 0.70% | 1.20% |  |
Liquidity Discount (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% | 4.50% | 4.40% | 5.10% | 4.20% | 4.90% |  |

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- Definition Percentage of credit risk rating and likelihood that a loan will not be repaid and instead default, used as an input to measure the fair value. + References No definition available. + Details
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- Definition Represents the liquidity discount expressed as a percentage, used as an input to measure fair value. + References No definition available. + Details
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- Definition Investments in notes or bonds that are collateralized by a specific group of underlying assets owned by the issuer of the notes or bonds which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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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 Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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