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Securities (Schedule of Information Regarding Securities with Unrealized Losses) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Total temporarily impaired securities Fair Value | $ 232,817 | $ 181,692
Total temporarily impaired securities Unrealized Losses | 4,138 | 1,371
Securities in an Unrealized Loss Position for More than 12 Months |  |
Total temporarily impaired securities Fair Value | 19,943 | 31,395
Total temporarily impaired securities Unrealized Losses | 622 | 954
Total temporarily impaired securities Fair Value | 252,760 | 213,087
Total temporarily impaired securities Unrealized Losses | 4,760 | 2,325
Government-sponsored enterprise securities [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
AFS Fair Value | 7,990 | 5,993
AFS Unrealized Losses | 7 | 7
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value |  | 2,978
AFS Unrealized Losses |  | 22
Total temporarily impaired securities Fair Value | 7,990 | 8,971
Total temporarily impaired securities Unrealized Losses | 7 | 29
Mortgage-backed securities [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
AFS Fair Value | 196,999 | 150,853
AFS Unrealized Losses | 3,841 | 1,148
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value | 19,001 | 27,460
AFS Unrealized Losses | 552 | 863
Total temporarily impaired securities Fair Value | 216,000 | 178,313
Total temporarily impaired securities Unrealized Losses | 4,393 | 2,011
Corporate bonds [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
AFS Fair Value | 27,027 | 24,006
AFS Unrealized Losses | 259 | 210
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value | 935 | 940
AFS Unrealized Losses | 65 | 60
Total temporarily impaired securities Fair Value | 27,962 | 24,946
Total temporarily impaired securities Unrealized Losses | 324 | 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 | 7 | 17
AFS Unrealized Losses | 5 | 9
Total temporarily impaired securities Fair Value | 7 | 17
Total temporarily impaired securities Unrealized Losses | 5 | 9
State and local governments [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
HTM Fair Value | 801 | 840
HTM Unrealized Losses | 31 | 6
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value |  |
AFS Unrealized Losses |  |
HTM Fair Value |  |
Total temporarily impaired securities Fair Value | 801 | 840
Total temporarily impaired securities Unrealized Losses | $ 31 | $ 6

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