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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, 2016 | Dec. 31, 2015
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Total temporarily impaired securities Fair Value | $ 17,194 | $ 181,692
Total temporarily impaired securities Unrealized Losses | 108 | 1,371
Securities in an Unrealized Loss Position for More than 12 Months |  |
Total temporarily impaired securities Fair Value | 18,014 | 31,395
Total temporarily impaired securities Unrealized Losses | 288 | 954
Total temporarily impaired securities Fair Value | 35,208 | 213,087
Total temporarily impaired securities Unrealized Losses | 396 | 2,325
Government-sponsored enterprise securities [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
AFS Fair Value | 2,999 | 5,993
AFS Unrealized Losses | 1 | 7
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value |  | 2,978
AFS Unrealized Losses |  | 22
Total AFS Fair Value | 2,999 | 8,971
Total AFS Unrealized Losses | 1 | 29
Mortgage-backed securities [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
AFS Fair Value | 11,695 | 150,853
AFS Unrealized Losses | 49 | 1,148
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value | 17,069 | 27,460
AFS Unrealized Losses | 216 | 863
Total AFS Fair Value | 28,764 | 178,313
Total AFS Unrealized Losses | 265 | 2,011
Corporate bonds [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
AFS Fair Value | 2,500 | 24,006
AFS Unrealized Losses | 58 | 210
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value | 935 | 940
AFS Unrealized Losses | 65 | 60
Total AFS Fair Value | 3,435 | 24,946
Total AFS Unrealized Losses | 123 | 270
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 | 10 | 17
AFS Unrealized Losses | 7 | 9
Total AFS Fair Value | 10 | 17
Total AFS Unrealized Losses | 7 | 9
State and local governments [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
AFS Fair Value |  | 840
AFS Unrealized Losses |  | 6
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value |  |
AFS Unrealized Losses |  |
Total AFS Fair Value |  | 840
Total AFS Unrealized Losses |  | $ 6

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