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Fair Value of Financial Instruments Fair Value of Financial Instruments 7 (Details) (USD $)
|
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
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Dec. 31, 2013
|
Dec. 31, 2012
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|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||
| Fair value of gain (loss) related to mortgage banking activities | $ 3,600,000 | $ (5,300,000) | $ 2,400,000 |
| Overnight repurchase agreements, value of securities pledged | 18,800,000 | 21,200,000 | |
| Overnight repurchase agreements, net | 4,700,000 | 7,000,000 | |
| Maturity Overnight | |||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||
| Overnight repurchase agreements primarily with commercial customers at an average rate of 0.17% and 0.15% at December 31, 2014 and 2013 | $ 14,087,000 | $ 14,233,000 | |