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Securities (Details 3) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Contractual maturity of debt securities |  |
Amortized cost, Total | $ 16,416 | $ 22,477
Available for Sale |  |
Estimated Fair Value, Total | 546,126 | 592,500
Held for Investment [Member] | Fair Value [Member] |  |
Contractual maturity of debt securities |  |
Estimated Fair Value, Within one year | 4,227 | 5,908
Estimated Fair Value, After one year but within five years | 10,496 | 14,256
Estimated Fair Value, After five years but within ten years | 1,438 | 1,943
Estimated Fair Value, After ten years | 528 | 851
Estimated Fair Value Total | 16,689 | 22,958
Held for Investment [Member] | Amortized Cost [Member] |  |
Contractual maturity of debt securities |  |
Amortized cost, Within one year | 4,180 | 5,845
Amortized cost, After one year but within five years | 10,360 | 13,967
Amortized cost, After five years but within ten years | 1,400 | 1,883
Amortized cost, After ten years | 476 | 782
Amortized cost, Total | 16,416 | 22,477
Available for Sale [Member] | Fair Value [Member] |  |
Available for Sale |  |
Estimated Fair Value, Within one year | 145,027 | 107,109
Estimated Fair Value, After one year but within five years | 259,475 | 321,661
Estimated Fair Value, After five years but within ten years | 38,306 | 63,358
Estimated Fair Value, After ten years | 93,293 | 88,210
Total debt securities | 536,101 | 580,338
Estimated Fair Value, Equity securities | 10,025 | 12,162
Estimated Fair Value, Total | 546,126 | 592,500
Available for Sale [Member] | Amortized Cost [Member] |  |
Available for Sale |  |
Amortized Cost, Within one year | 144,666 | 105,169
Amortized Cost, After one year but within five years | 256,890 | 317,979
Amortized Cost, After five years but within ten years | 36,764 | 61,412
Amortized Cost, After ten years | 90,626 | 86,149
Amortized Cost, Equity securities | 7,463 | 7,222
Amortized Cost, Total | 536,409 | 577,931
Total debt securities | $ 528,946 | $ 570,709

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