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Loans and Allowance for Loan Losses (Details 4) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Impaired loans |  |
Unpaid Contractual Principal Balance, with no related allowance | $ 19,007,000 | $ 20,038,000
Recorded Principal Balance, with no related allowance | 10,931,000 | 11,752,000
Year-To-Date Average Recorded Principal Balance, with no related allowance | 11,342,000 | 16,770,000
Impaired loans, Unpaid Contractual Principal Balance | 61,115,000 | 69,166,000
Impaired loans, Recorded Principal Balance | 51,700,000 | 57,279,000
Impaired loans, Related Allowance | 14,893,000 | 17,189,000
Impaired loans, Year-To-Date Average Recorded Principal Balance | 54,489,000 | 61,318,000
Unpaid Contractual Principal Balance, with related allowance | 42,108,000 | 49,128,000
Recorded Principal Balance, with related allowance | 40,769,000 | 45,527,000
Year-To-Date Average Recorded Principal Balance, with related allowance | 43,147,000 | 44,548,000
Commercial and industrial [Member] |  |
Impaired loans |  |
Unpaid Contractual Principal Balance, with no related allowance | 2,972,000 | 1,926,000
Recorded Principal Balance, with no related allowance | 1,556,000 | 1,617,000
Year-To-Date Average Recorded Principal Balance, with no related allowance | 1,587,000 | 3,140,000
Impaired loans, Related Allowance | 1,407,000 | 924,000
Unpaid Contractual Principal Balance, with related allowance | 2,616,000 | 3,221,000
Recorded Principal Balance, with related allowance | 2,506,000 | 1,926,000
Year-To-Date Average Recorded Principal Balance, with related allowance | 2,216,000 | 3,110,000
Vacant land, land development, and residential construction [Member] |  |
Impaired loans |  |
Unpaid Contractual Principal Balance, with no related allowance | 2,342,000 | 2,356,000
Recorded Principal Balance, with no related allowance | 1,378,000 | 1,401,000
Year-To-Date Average Recorded Principal Balance, with no related allowance | 1,389,000 | 1,848,000
Impaired loans, Related Allowance | 726,000 | 1,367,000
Unpaid Contractual Principal Balance, with related allowance | 1,958,000 | 2,333,000
Recorded Principal Balance, with related allowance | 1,480,000 | 2,219,000
Year-To-Date Average Recorded Principal Balance, with related allowance | 1,849,000 | 3,267,000
Real estate - owner occupied [Member] |  |
Impaired loans |  |
Unpaid Contractual Principal Balance, with no related allowance | 2,314,000 | 2,368,000
Recorded Principal Balance, with no related allowance | 1,349,000 | 1,557,000
Year-To-Date Average Recorded Principal Balance, with no related allowance | 1,453,000 | 3,139,000
Impaired loans, Related Allowance | 1,162,000 | 1,388,000
Unpaid Contractual Principal Balance, with related allowance | 3,417,000 | 4,307,000
Recorded Principal Balance, with related allowance | 2,953,000 | 3,626,000
Year-To-Date Average Recorded Principal Balance, with related allowance | 3,289,000 | 4,913,000
Real estate - non-owner occupied [Member] |  |
Impaired loans |  |
Unpaid Contractual Principal Balance, with no related allowance | 7,440,000 | 9,984,000
Recorded Principal Balance, with no related allowance | 4,717,000 | 5,492,000
Year-To-Date Average Recorded Principal Balance, with no related allowance | 5,105,000 | 6,578,000
Impaired loans, Related Allowance | 10,411,000 | 11,773,000
Unpaid Contractual Principal Balance, with related allowance | 30,428,000 | 33,818,000
Recorded Principal Balance, with related allowance | 30,322,000 | 32,964,000
Year-To-Date Average Recorded Principal Balance, with related allowance | 31,643,000 | 25,061,000
Real estate - multi-family and residential rental [Member] |  |
Impaired loans |  |
Unpaid Contractual Principal Balance, with no related allowance | 1,729,000 | 1,188,000
Recorded Principal Balance, with no related allowance | 684,000 | 413,000
Year-To-Date Average Recorded Principal Balance, with no related allowance | 549,000 | 756,000
Impaired loans, Related Allowance | 910,000 | 1,408,000
Unpaid Contractual Principal Balance, with related allowance | 2,761,000 | 4,471,000
Recorded Principal Balance, with related allowance | 2,691,000 | 3,923,000
Year-To-Date Average Recorded Principal Balance, with related allowance | 3,307,000 | 7,429,000
Total commercial [Member] |  |
Impaired loans |  |
Unpaid Contractual Principal Balance, with no related allowance | 16,797,000 | 17,822,000
Recorded Principal Balance, with no related allowance | 9,684,000 | 10,480,000
Year-To-Date Average Recorded Principal Balance, with no related allowance | 10,083,000 | 15,461,000
Impaired loans, Unpaid Contractual Principal Balance | 57,977,000 | 65,972,000
Impaired loans, Recorded Principal Balance | 49,636,000 | 55,138,000
Impaired loans, Related Allowance | 14,616,000 | 16,860,000
Impaired loans, Year-To-Date Average Recorded Principal Balance | 52,387,000 | 59,241,000
Unpaid Contractual Principal Balance, with related allowance | 41,180,000 | 48,150,000
Recorded Principal Balance, with related allowance | 39,952,000 | 44,658,000
Year-To-Date Average Recorded Principal Balance, with related allowance | 42,304,000 | 43,780,000
Retail home equity and other [Member] |  |
Impaired loans |  |
Unpaid Contractual Principal Balance, with no related allowance | 580,000 | 580,000
Recorded Principal Balance, with no related allowance | 480,000 | 483,000
Year-To-Date Average Recorded Principal Balance, with no related allowance | 481,000 | 579,000
Impaired loans, Related Allowance | 155,000 | 204,000
Unpaid Contractual Principal Balance, with related allowance | 369,000 | 423,000
Recorded Principal Balance, with related allowance | 346,000 | 394,000
Year-To-Date Average Recorded Principal Balance, with related allowance | 370,000 | 286,000
Retail 1-4 family mortgages [Member] |  |
Impaired loans |  |
Unpaid Contractual Principal Balance, with no related allowance | 1,630,000 | 1,636,000
Recorded Principal Balance, with no related allowance | 767,000 | 789,000
Year-To-Date Average Recorded Principal Balance, with no related allowance | 778,000 | 730,000
Impaired loans, Related Allowance | 122,000 | 125,000
Unpaid Contractual Principal Balance, with related allowance | 559,000 | 555,000
Recorded Principal Balance, with related allowance | 471,000 | 475,000
Year-To-Date Average Recorded Principal Balance, with related allowance | 473,000 | 482,000
Total retail [Member] |  |
Impaired loans |  |
Unpaid Contractual Principal Balance, with no related allowance | 2,210,000 | 2,216,000
Recorded Principal Balance, with no related allowance | 1,247,000 | 1,272,000
Year-To-Date Average Recorded Principal Balance, with no related allowance | 1,259,000 | 1,309,000
Impaired loans, Unpaid Contractual Principal Balance | 3,138,000 | 3,194,000
Impaired loans, Recorded Principal Balance | 2,064,000 | 2,141,000
Impaired loans, Related Allowance | 277,000 | 329,000
Impaired loans, Year-To-Date Average Recorded Principal Balance | 2,102,000 | 2,077,000
Unpaid Contractual Principal Balance, with related allowance | 928,000 | 978,000
Recorded Principal Balance, with related allowance | 817,000 | 869,000
Year-To-Date Average Recorded Principal Balance, with related allowance | $ 843,000 | $ 768,000

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