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Securities (Tables) | 9 Months Ended
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Sep. 30, 2012
Securities [Abstract] |
Fair value of securities |
September 30, 2012 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and federal agencies |  | $ | 46,982 |  |  | $ | 394 |  |  | $ | — |  |  | $ | 47,376 |
State and municipal |  |  | 163,407 |  |  |  | 11,476 |  |  |  | (62 | ) |  |  | 174,821 |
Federal agency collateralized mortgage obligations |  |  | 97,534 |  |  |  | 1,621 |  |  |  | (114 | ) |  |  | 99,041 |
Federal agency mortgage-backed pools |  |  | 166,029 |  |  |  | 8,114 |  |  |  | (6 | ) |  |  | 174,137 |
Private labeled mortgage-backed pools |  |  | 2,207 |  |  |  | 81 |  |  |  | — |  |  |  | 2,288 |
Corporate notes |  |  | 32 |  |  |  | 9 |  |  |  | — |  |  |  | 41 |
Total available for sale investment securities |  | $ | 476,191 |  |  | $ | 21,695 |  |  | $ | (182 | ) |  | $ | 497,704 |
Held to maturity, State and Municipal |  | $ | 6,100 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,100 |
December 31, 2011 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and federal agencies |  | $ | 12,693 |  |  | $ | 329 |  |  | $ | — |  |  | $ | 13,022 |
State and municipal |  |  | 135,011 |  |  |  | 8,950 |  |  |  | (71 | ) |  |  | 143,890 |
Federal agency collateralized mortgage obligations |  |  | 89,016 |  |  |  | 2,106 |  |  |  | — |  |  |  | 91,122 |
Federal agency mortgage-backed pools |  |  | 173,797 |  |  |  | 5,669 |  |  |  | (115 | ) |  |  | 179,351 |
Private labeled mortgage-backed pools |  |  | 3,518 |  |  |  | 118 |  |  |  | — |  |  |  | 3,636 |
Corporate notes |  |  | 32 |  |  |  | — |  |  |  | (8 | ) |  |  | 24 |
Total available for sale investment securities |  | $ | 414,067 |  |  | $ | 17,172 |  |  | $ | (194 | ) |  | $ | 431,045 |
Held to maturity, State and Municipal |  | $ | 7,100 |  |  | $ | 34 |  |  | $ | — |  |  | $ | 7,134 |
Amortized cost and fair value of securities available for sale and held to maturity |
|  | September 30, 2012 |  |  | December 31, 2011 |
|  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Within one year |  | $ | 4,232 |  |  | $ | 4,245 |  |  | $ | 931 |  |  | $ | 940 |
One to five years |  |  | 45,096 |  |  |  | 46,420 |  |  |  | 30,796 |  |  |  | 31,910 |
Five to ten years |  |  | 97,217 |  |  |  | 102,990 |  |  |  | 51,476 |  |  |  | 55,053 |
After ten years |  |  | 63,876 |  |  |  | 68,583 |  |  |  | 64,533 |  |  |  | 69,033 |
|  |  | 210,421 |  |  |  | 222,238 |  |  |  | 147,736 |  |  |  | 156,936 |
Federal agency collateralized mortgage obligations |  |  | 97,534 |  |  |  | 99,041 |  |  |  | 89,016 |  |  |  | 91,122 |
Federal agency mortgage-backed pools |  |  | 166,029 |  |  |  | 174,137 |  |  |  | 173,797 |  |  |  | 179,351 |
Private labeled mortgage-backed pools |  |  | 2,207 |  |  |  | 2,288 |  |  |  | 3,518 |  |  |  | 3,636 |
Total available for sale investment securities |  | $ | 476,191 |  |  | $ | 497,704 |  |  | $ | 414,067 |  |  | $ | 431,045 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Within one year |  | $ | 6,100 |  |  | $ | 6,100 |  |  | $ | 7,100 |  |  | $ | 7,134 |
One to five years |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total held to maturity investment securities |  | $ | 6,100 |  |  | $ | 6,100 |  |  | $ | 7,100 |  |  | $ | 7,134 |
Gross unrealized losses and the fair value of the Company's investments |
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
September 30, 2012 |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
State and municipal |  | $ | 9,535 |  |  | $ | (62 | ) |  | $ | — |  |  | $ | — |  |  | $ | 9,535 |  |  | $ | (62 | )
Federal agency collateralized mortgage obligations |  |  | 19,284 |  |  |  | (114 | ) |  |  | — |  |  |  | — |  |  |  | 19,284 |  |  |  | (114 | )
Federal agency mortgage-backed pools |  |  | 4,479 |  |  |  | (6 | ) |  |  | — |  |  |  | — |  |  |  | 4,479 |  |  |  | (6 | )
Total temporarily impaired securities |  | $ | 33,298 |  |  | $ | (182 | ) |  | $ | — |  |  | $ | — |  |  | $ | 33,298 |  |  | $ | (182 | )
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
December 31, 2011 |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
State and municipal |  | $ | 1,550 |  |  | $ | (44 | ) |  | $ | 1,948 |  |  | $ | (27 | ) |  | $ | 3,498 |  |  | $ | (71 | )
Federal agency mortgage-backed pools |  |  | 23,442 |  |  |  | (115 | ) |  |  | 23 |  |  |  | — |  |  |  | 23,465 |  |  |  | (115 | )
Corporate notes |  |  | 24 |  |  |  | (8 | ) |  |  | — |  |  |  | — |  |  |  | 24 |  |  |  | (8 | )
Total temporarily impaired securities |  | $ | 25,016 |  |  | $ | (167 | ) |  | $ | 1,971 |  |  | $ | (27 | ) |  | $ | 26,987 |  |  | $ | (194 | )
Sales of securities available for sale |
|  | Three months ended September 30 |  |  | Nine months ended September 30 |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Sales of securities available for sale (Unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds |  | $ | 14,991 |  |  | $ | 153,299 |  |  | $ | 14,991 |  |  | $ | 170,689 |
Gross gains |  |  | 3 |  |  |  | 1,115 |  |  |  | 3 |  |  |  | 1,754 |
Gross losses |  |  | (1 | ) |  |  | — |  |  |  | (1 | ) |  |  | — |

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