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Securities (Schedule of Information Regarding Securities with Unrealized Losses) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Total temporarily impaired securities Fair Value | $ 164,154 | $ 75,474
Total temporarily impaired securities Unrealized Losses | 925 | 329
Securities in an Unrealized Loss Position for More than 12 Months |  |
Total temporarily impaired securities Fair Value | 35,531 | 37,392
Total temporarily impaired securities Unrealized Losses | 1,013 | 1,299
Total temporarily impaired securities Fair Value | 199,685 | 112,866
Total temporarily impaired securities Unrealized Losses | $ 1,938 | 1,628
Government-sponsored enterprises securities [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
AFS Fair Value |  | 5,489
AFS Unrealized Losses |  | 11
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value | $ 2,991 | 2,953
AFS Unrealized Losses | 8 | 47
Total temporarily impaired securities Fair Value | 2,991 | 8,442
Total temporarily impaired securities Unrealized Losses | 8 | 58
Mortgage-backed securities [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
AFS Fair Value | 141,334 | 69,985
AFS Unrealized Losses | 685 | 318
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value | 31,578 | 33,557
AFS Unrealized Losses | 934 | 1,104
Total temporarily impaired securities Fair Value | 172,912 | 103,542
Total temporarily impaired securities Unrealized Losses | 1,619 | $ 1,422
Corporate bonds [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
AFS Fair Value | 21,991 |
AFS Unrealized Losses | 219 |
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value | 940 | $ 865
AFS Unrealized Losses | 60 | 135
Total temporarily impaired securities Fair Value | 22,931 | 865
Total temporarily impaired securities Unrealized Losses | $ 279 | $ 135
Equity securities [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
AFS Fair Value |  |
AFS Unrealized Losses |  |
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value | $ 22 | $ 17
AFS Unrealized Losses | 11 | 13
Total temporarily impaired securities Fair Value | 22 | 17
Total temporarily impaired securities Unrealized Losses | 11 | $ 13
States and local governments [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
HTM Fair Value | 829 |
HTM Unrealized Losses | $ 21 |
Securities in an Unrealized Loss Position for More than 12 Months |  |
HTM Fair Value |  |
HTM Unrealized Losses |  |
Total temporarily impaired securities Fair Value | $ 829 |
Total temporarily impaired securities Unrealized Losses | $ 21 |

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