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Securities (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Fair value of securities |  |
Total available for sale investment securities, Amortized Cost | $ 477,196 | $ 463,306
Gross Unrealized Gains | 11,113 | 19,663
Gross Unrealized Losses | (5,856) | (168)
Available-for-sale Securities, Fair Value | 482,453 | 482,801
Held-to-maturity, Amortized Cost | 9,910 |
Held-to-maturity, Fair Value | 9,910 |
U.S. Treasury and federal agencies [Member] |  |
Fair value of securities |  |
Total available for sale investment securities, Amortized Cost | 39,071 | 51,458
Gross Unrealized Gains | 150 | 351
Gross Unrealized Losses | (614) | (30)
Available-for-sale Securities, Fair Value | 38,607 | 51,779
State and municipal [Member] |  |
Fair value of securities |  |
Total available for sale investment securities, Amortized Cost | 176,838 | 162,147
Gross Unrealized Gains | 5,949 | 10,842
Gross Unrealized Losses | (2,420) | (84)
Available-for-sale Securities, Fair Value | 180,367 | 172,905
Held-to-maturity, Amortized Cost | 9,910 |
Held-to-maturity, Gross Unrealized Gains |  |
Held-to-maturity, Gross Unrealized Losses |  |
Held-to-maturity, Fair Value | 9,910 |
Federal agency collateralized mortgage obligations [Member] |  |
Fair value of securities |  |
Total available for sale investment securities, Amortized Cost | 108,607 | 95,337
Gross Unrealized Gains | 1,366 | 1,533
Gross Unrealized Losses | (1,170) | (39)
Available-for-sale Securities, Fair Value | 108,803 | 96,831
Federal agency mortgage-backed pools [Member] |  |
Fair value of securities |  |
Total available for sale investment securities, Amortized Cost | 151,146 | 152,372
Gross Unrealized Gains | 3,583 | 6,847
Gross Unrealized Losses | (1,652) | (15)
Available-for-sale Securities, Fair Value | 153,077 | 159,204
Private labeled mortgage-backed pools [Member] |  |
Fair value of securities |  |
Total available for sale investment securities, Amortized Cost | 1,502 | 1,960
Gross Unrealized Gains | 52 | 71
Available-for-sale Securities, Fair Value | 1,554 | 2,031
Corporate notes [Member] |  |
Fair value of securities |  |
Total available for sale investment securities, Amortized Cost | 32 | 32
Gross Unrealized Gains | 13 | 19
Available-for-sale Securities, Fair Value | $ 45 | $ 51

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