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Securities (Schedule of Information Regarding Securities with Unrealized Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Total temporarily impaired securities Fair Value | $ 196,029 | $ 232,817
Total temporarily impaired securities Unrealized Losses | 2,639 | 4,138
Securities in an Unrealized Loss Position for More than 12 Months |  |
Total temporarily impaired securities Fair Value | 18,802 | 19,943
Total temporarily impaired securities Unrealized Losses | 578 | 622
Total temporarily impaired securities Fair Value | 214,831 | 252,760
Total temporarily impaired securities Unrealized Losses | 3,217 | 4,760
Government-sponsored enterprise securities [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
AFS Fair Value | 13,917 | 7,990
AFS Unrealized Losses | 80 | 7
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value |  |
AFS Unrealized Losses |  |
Total AFS Fair Value | 13,917 | 7,990
Total AFS Unrealized Losses | 80 | 7
Mortgage-backed securities [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
AFS Fair Value | 167,034 | 196,999
AFS Unrealized Losses | 2,513 | 3,841
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value | 17,862 | 19,001
AFS Unrealized Losses | 518 | 552
Total AFS Fair Value | 184,896 | 216,000
Total AFS Unrealized Losses | 3,031 | 4,393
Corporate bonds [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
AFS Fair Value | 8,021 | 27,027
AFS Unrealized Losses | 17 | 259
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value | 940 | 935
AFS Unrealized Losses | 60 | 65
Total AFS Fair Value | 8,961 | 27,962
Total AFS Unrealized Losses | 77 | 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 AFS Fair Value |  | 7
Total AFS Unrealized Losses |  | 5
State and local governments [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
AFS Fair Value | 7,057 | 801
AFS Unrealized Losses | 29 | 31
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value |  |
AFS Unrealized Losses |  |
Total AFS Fair Value | 7,057 | 801
Total AFS Unrealized Losses | $ 29 | $ 31

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