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Investment Securities (Investments Classified by Maturity Date) (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
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Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: Due in one year or less, amortized cost | $ 14,556 |
Investment Securities Available-for-Sale: Due in one year or less, fair value | 14,476 |
Investment Securities Available-for-Sale: Due after one year through five years, amortized cost | 96,758 |
Investment Securities Available-for-Sale: Due after on eyear through five years, fair value | 97,606 |
Investment Securities Available-for-Sale: Due after five years through ten years, amortized cost | 116,072 |
Investment Securities Available-for-Sale: Dur after five years through ten years, fair value | 117,896 |
Investment Securities Available-for-Sale: Due after ten years, amortized cost | 126,779 |
Investment Securities Available-for-Sale: Due after ten years, fair value | 126,763 |
Investment Securities Available-for-Sale: amortized cost | 11,229 |
Investment Securities Available-for-Sale: fair value | 11,255 |
Available-for-sale Securities, Amortized Cost Basis | 462,700 | 417,939
Available-for-sale Securities | 467,190 | 414,507
Investment Securities Held-to-Maturity: Due after five years through ten years, amortized cost | 5,498 |
Investment Securities Held-to-Maturity: Due after five through ten years, fair value | 5,607 |
Investment Securities Held-to-Maturity: Due after ten years, amortized cost | 51,317 |
Investment Securities Held-to-Maturity: Due after ten years, fair value | 54,688 |
Investment Securities Held-to-Maturity: amoritzed cost | 6,182 |
Investment Securities Held-to-Maturity: fair value | 6,267 |
Held-to-maturity Securities | 62,997 | 72,233
Held-to-maturity Securities, Fair Value | 66,562 | 74,922
Marketable Securities | 525,697 |
Marketable Securities, Fair Value Disclosure | 533,752 |
Equity securities [Member] |  |
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: amortized cost | 772 |
Investment Securities Available-for-Sale: fair value | 601 |
Available-for-sale Securities, Amortized Cost Basis | 772 | 535
Available-for-sale Securities | 601 | 262
Residential mortgage-backed securities [Member] |  |
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: amortized cost | 86,792 |
Investment Securities Available-for-Sale: fair value | 88,794 |
Available-for-sale Securities, Amortized Cost Basis | 86,792 | 113,213
Available-for-sale Securities | 88,794 | 115,364
Commercial mortgage-backed securities [Member] |  |
Schedule of Investments [Line Items] |  |
Investment Securities Available-for-Sale: amortized cost | 9,742 |
Investment Securities Available-for-Sale: fair value | 9,799 |
Available-for-sale Securities, Amortized Cost Basis | 9,742 |
Available-for-sale Securities | 9,799 |
Held-to-maturity Securities, Fair Value | $ 6,267 | $ 6,207

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