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Loans and Asset Quality Information (Narrative) (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 01, 2016 | Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Total Covered Loans - Carrying Value |  | $ 99,523,000 | $ 119,829,000 | $ 102,641,000
Foreclosed real estate - covered |  | 1,569,000 | 2,055,000 | 806,000
Nonaccrual loans |  | 41,411,000 |  | 47,810,000
Accretion of loan discount |  | $ 1,055,000 |  | 4,751,000
Percentage of loan discount accretion |  | 80.00% |  |
Payments that exceeded the initial carrying amount on purchased impaired loans |  | $ 69,000 | 0 |
Contractual balance of nonaccrual loans |  | 9,000,000 | $ 14,100,000 | 12,300,000
Purchased Accruing Loans [Member] |  |  |  |
Loan discount on loans |  | 12,489,000 |  |
Purchased Nonaccruing Loans [Member] |  |  |  |
Loan discount on loans |  | 1,546,000 |  |
Covered Loss Sharing Subsequent Change to Noncovered [Member] | Subsequent Event [Member] |  |  |  |
Total Covered Loans - Carrying Value | $ 17,700,000 |  |  |
Foreclosed real estate - covered | 1,200,000 |  |  |
Nonaccrual loans | 2,800,000 |  |  |
Transfer of allowance of loan losses from covered to non-covered | 300,000 |  |  |
Total loans transferred to non-covered status | $ 17,700,000 |  |  |
Residential mortgage loans [Member] |  |  |  |
Total Covered Loans - Carrying Value |  | 73,611,000 |  | $ 75,657,000
Nonaccrual loans in process of foreclosure |  | $ 2,100,000 |  |

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