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Securities (Reconciliation of fair value of securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | $ 969 | $ 3,740
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (15,603) | (4,461)
Debt Securities, Available-for-sale | 435,861 | 447,498
Debt Securities, Available-for-sale, Amortized Cost | 450,495 | 448,219
Held to maturity Securities, Amortized Cost | 553,705 | 497,688
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 166 | 2,429
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (19,249) | (5,923)
Held to Maturity, Fair Value, Total | 534,622 | 494,194
Amortized Cost | 1,004,200 | 945,907
Gross Unrealized Gains | 1,135 | 6,169
Unrealized Losses Other | (34,852) | (10,384)
Debt Securities, Available-for-sale and Held-to-maturity | 970,483 | 941,692
U.S. Government agency securities |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 86
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (907) | (131)
Debt Securities, Available-for-sale | 31,572 | 35,430
Debt Securities, Available-for-sale, Amortized Cost | 32,479 | 35,475
U.S. Treasury securities |  |
Reconciliation of fair value of securities |  |
Held to maturity Securities, Amortized Cost | 1,004 | 1,006
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 2 | 29
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Held to Maturity, Fair Value, Total | 1,006 | 1,035
Agency mortgage-backed securities |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 874 | 1,897
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (6,510) | (1,067)
Debt Securities, Available-for-sale | 207,523 | 215,764
Debt Securities, Available-for-sale, Amortized Cost | 213,159 | 214,934
Held to maturity Securities, Amortized Cost | 189,479 | 204,768
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 136 | 1,791
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (5,527) | (736)
Held to Maturity, Fair Value, Total | 184,088 | 205,823
Agency Collateralized Mortgage Obligations [Member] |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 83 | 78
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (6,202) | (2,164)
Debt Securities, Available-for-sale | 137,645 | 122,012
Debt Securities, Available-for-sale, Amortized Cost | 143,764 | 124,098
Held to maturity Securities, Amortized Cost | 336,346 | 262,998
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 28 | 397
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (12,858) | (4,987)
Held to Maturity, Fair Value, Total | 323,516 | 258,408
US States and Political Subdivisions Debt Securities [Member] |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 8 | 37
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Debt Securities, Available-for-sale | 1,981 | 2,274
Debt Securities, Available-for-sale, Amortized Cost | 1,973 | 2,237
Single Issuer Trust Preferred Securities Issued by Banks and Insurers [Member] |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4 | 4
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Debt Securities, Available-for-sale | 1,004 | 2,016
Debt Securities, Available-for-sale, Amortized Cost | 1,000 | 2,012
Held to maturity Securities, Amortized Cost | 1,500 | 1,500
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 29
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (10) | 0
Held to Maturity, Fair Value, Total | 1,490 | 1,529
Pooled trust preferred securities issued by banks and insurers |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (359) | (539)
Debt Securities, Available-for-sale | 1,800 | 1,640
Debt Securities, Available-for-sale, Amortized Cost | 2,159 | 2,179
Small Business Administration Pooled Securities [Member] |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 44
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (1,625) | (118)
Debt Securities, Available-for-sale | 54,336 | 47,778
Debt Securities, Available-for-sale, Amortized Cost | 55,961 | 47,852
Held to maturity Securities, Amortized Cost | 25,376 | 27,416
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 183
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (854) | (200)
Held to Maturity, Fair Value, Total | 24,522 | 27,399
Equity Securities [Member] |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 1,594
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | (442)
Debt Securities, Available-for-sale |  | 20,584
Debt Securities, Available-for-sale, Amortized Cost | $ 0 | $ 19,432

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