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Securities (Schedule of Information Regarding Securities with Unrealized Losses) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Total temporarily impaired securities Fair Value | $ 214,027 | $ 232,817
Total temporarily impaired securities Unrealized Losses | 1,782 | 4,138
Securities in an Unrealized Loss Position for More than 12 Months |  |
Total temporarily impaired securities Fair Value | 128,965 | 19,943
Total temporarily impaired securities Unrealized Losses | 1,972 | 622
Total temporarily impaired securities Fair Value | 342,992 | 252,760
Total temporarily impaired securities Unrealized Losses | 3,754 | 4,760
Government-sponsored enterprise securities [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
AFS Fair Value | 10,897 | 7,990
AFS Unrealized Losses | 103 | 7
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value | 2,970 |
AFS Unrealized Losses | 30 |
Total temporarily impaired securities Fair Value | 13,867 | 7,990
Total temporarily impaired securities Unrealized Losses | 133 | 7
Mortgage-backed securities [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
AFS Fair Value | 192,702 | 196,999
AFS Unrealized Losses | 1,582 | 3,841
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value | 125,060 | 19,001
AFS Unrealized Losses | 1,877 | 552
Total temporarily impaired securities Fair Value | 317,762 | 216,000
Total temporarily impaired securities Unrealized Losses | 3,459 | 4,393
Corporate bonds [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
AFS Fair Value | 2,500 | 27,027
AFS Unrealized Losses | 49 | 259
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value | 935 | 935
AFS Unrealized Losses | 65 | 65
Total temporarily impaired securities Fair Value | 3,435 | 27,962
Total temporarily impaired securities Unrealized Losses | 114 | 324
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 |  | 7
AFS Unrealized Losses |  | 5
Total temporarily impaired securities Fair Value |  | 7
Total temporarily impaired securities Unrealized Losses |  | 5
State and local governments [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
HTM Fair Value | 7,928 | 801
HTM Unrealized Losses | 48 | 31
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value |  |
AFS Unrealized Losses |  |
Total temporarily impaired securities Fair Value | 7,928 | 801
Total temporarily impaired securities Unrealized Losses | $ 48 | $ 31

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