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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, 2016 | Dec. 31, 2015
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Total temporarily impaired securities Fair Value | $ 131,973 | $ 181,692
Total temporarily impaired securities Unrealized Losses | 735 | 1,371
Securities in an Unrealized Loss Position for More than 12 Months |  |
Total temporarily impaired securities Fair Value | 29,087 | 31,395
Total temporarily impaired securities Unrealized Losses | 624 | 954
Total temporarily impaired securities Fair Value | 161,060 | 213,087
Total temporarily impaired securities Unrealized Losses | $ 1,359 | 2,325
Government-sponsored enterprises securities [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
AFS Fair Value |  | 5,993
AFS Unrealized Losses |  | 7
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value | $ 2,994 | 2,978
AFS Unrealized Losses | 6 | 22
Total temporarily impaired securities Fair Value | 2,994 | 8,971
Total temporarily impaired securities Unrealized Losses | 6 | 29
Mortgage-backed securities [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
AFS Fair Value | 117,206 | 150,853
AFS Unrealized Losses | 602 | 1,148
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value | 25,136 | 27,460
AFS Unrealized Losses | 549 | 863
Total temporarily impaired securities Fair Value | 142,342 | 178,313
Total temporarily impaired securities Unrealized Losses | 1,151 | 2,011
Corporate bonds [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
AFS Fair Value | 13,926 | 24,006
AFS Unrealized Losses | 131 | 210
Securities in an Unrealized Loss Position for More than 12 Months |  |
AFS Fair Value | 940 | 940
AFS Unrealized Losses | 60 | 60
Total temporarily impaired securities Fair Value | 14,866 | 24,946
Total temporarily impaired securities Unrealized Losses | $ 191 | $ 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 | $ 17 | $ 17
AFS Unrealized Losses | 9 | 9
Total temporarily impaired securities Fair Value | 17 | 17
Total temporarily impaired securities Unrealized Losses | 9 | 9
States and local governments [Member] |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
HTM Fair Value | 841 | 840
HTM Unrealized Losses | $ 2 | $ 6
Securities in an Unrealized Loss Position for More than 12 Months |  |
HTM Fair Value |  |
HTM Unrealized Losses |  |
Total temporarily impaired securities Fair Value | $ 841 | $ 840
Total temporarily impaired securities Unrealized Losses | $ 2 | $ 6

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