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Loans and Asset Quality Information (Narrative) (Details) - USD ($) |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 02, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Total Covered Loans - Carrying Value |  | $ 106,609,000 | $ 133,249,000 | $ 127,594,000
Foreclosed real estate - covered |  | 1,569,000 | 3,237,000 | 2,350,000
Nonaccrual loans |  | 47,720,000 |  | 60,574,000
Accretion of loan discount |  | $ 3,897,000 |  | 16,009,000
Percentage of loan discount accretion |  | 80.00% |  |
Payments that exceeded the initial carrying amount on purchased impaired loans |  | $ 56,000 | 179,000 |
Contractual balance of nonaccrual loans |  | 10,100,000 | $ 16,300,000 | 16,000,000
Purchased Accruing Loans [Member] |  |  |  |
Loan discount on loans |  | 14,151,000 |  |
Purchased Nonaccruing Loans [Member] |  |  |  |
Loan discount on loans |  | 2,043,000 |  |
Covered Loss Sharing Subsequent Change to Noncovered [Member] |  |  |  |
Total Covered Loans - Carrying Value | $ 39,700,000 |  |  |
Foreclosed real estate - covered | 3,000,000 |  |  |
Nonaccrual loans | 9,700,000 |  |  |
Restructured loans - accruing | 2,100,000 |  |  |
Transfer of allowance of loan losses from covered to non-covered | 1,700,000 |  |  |
Total loans transferred to non-covered status | $ 39,700,000 |  |  |
Residential mortgage loans [Member] |  |  |  |
Total Covered Loans - Carrying Value |  | 78,260,000 |  | $ 89,770,000
Nonaccrual loans in process of foreclosure |  | $ 3,000,000 |  |

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