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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, 2017 | Dec. 31, 2016
Total temporarily impaired securities Fair Value | $ 116,928 | $ 232,817
Total temporarily impaired securities Unrealized Losses | 564 | 4,138
Total temporarily impaired securities Fair Value | 25,998 | 19,943
Total temporarily impaired securities Unrealized Losses | 573 | 622
Total temporarily impaired securities Fair Value | 142,926 | 252,760
Total temporarily impaired securities Unrealized Losses | 1,137 | 4,760
Government-sponsored enterprise securities [Member] |  |
AFS Fair Value | 6,491 | 7,990
AFS Unrealized Losses | 9 | 7
AFS Fair Value |  |
AFS Unrealized Losses |  |
Total AFS Fair Value | 6,491 | 7,990
Total AFS Unrealized Losses | 9 | 7
Mortgage-backed securities [Member] |  |
AFS Fair Value | 110,437 | 196,999
AFS Unrealized Losses | 555 | 3,841
AFS Fair Value | 24,250 | 19,001
AFS Unrealized Losses | 501 | 552
Total AFS Fair Value | 134,687 | 216,000
Total AFS Unrealized Losses | 1,056 | 4,393
Corporate bonds [Member] |  |
AFS Fair Value |  | 27,027
AFS Unrealized Losses |  | 259
AFS Fair Value | 935 | 935
AFS Unrealized Losses | 65 | 65
Total AFS Fair Value | 935 | 27,962
Total AFS Unrealized Losses | 65 | 324
Equity securities [Member] |  |
AFS Fair Value |  |
AFS Unrealized Losses |  |
AFS Fair Value |  | 7
AFS Unrealized Losses |  | 5
Total AFS Fair Value |  | 7
Total AFS Unrealized Losses |  | 5
State and local governments [Member] |  |
AFS Fair Value |  | 801
AFS Unrealized Losses |  | 31
AFS Fair Value | 813 |
AFS Unrealized Losses | 7 |
Total AFS Fair Value | 813 | 801
Total AFS Unrealized Losses | $ 7 | $ 31

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