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Securities (Reconciliation of fair value of securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | $ 2,224 | $ 1,233
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (3,842) | (9,029)
Debt Securities, Available-for-sale | 437,689 | 442,752
Debt Securities, Available-for-sale, Amortized Cost | 439,307 | 450,548
Held to maturity Securities, Amortized Cost | 623,243 | 611,490
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 5,574 | 2,533
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (5,661) | (10,383)
Held to Maturity, Fair Value, Total | 623,156 | 603,640
Amortized Cost | 1,062,550 | 1,062,038
Gross Unrealized Gains | 7,798 | 3,766
Unrealized Losses Other | (9,503) | (19,412)
Debt Securities, Available-for-sale and Held-to-maturity | 1,060,845 | 1,046,392
U.S. Government agency securities |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 25 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (47) | (439)
Debt Securities, Available-for-sale | 32,455 | 32,038
Debt Securities, Available-for-sale, Amortized Cost | 32,477 | 32,477
U.S. Treasury securities |  |
Reconciliation of fair value of securities |  |
Held to maturity Securities, Amortized Cost | 1,004 | 1,004
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 13 | 11
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Held to Maturity, Fair Value, Total | 1,017 | 1,015
Agency mortgage-backed securities |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,674 | 1,020
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (1,042) | (3,406)
Debt Securities, Available-for-sale | 217,795 | 220,105
Debt Securities, Available-for-sale, Amortized Cost | 217,163 | 222,491
Held to maturity Securities, Amortized Cost | 259,599 | 252,484
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 3,238 | 1,548
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (955) | (3,104)
Held to Maturity, Fair Value, Total | 261,882 | 250,928
Agency Collateralized Mortgage Obligations [Member] |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 338 | 197
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (1,832) | (3,435)
Debt Securities, Available-for-sale | 131,531 | 134,911
Debt Securities, Available-for-sale, Amortized Cost | 133,025 | 138,149
Held to maturity Securities, Amortized Cost | 337,804 | 332,775
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 2,208 | 869
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (4,307) | (6,920)
Held to Maturity, Fair Value, Total | 335,705 | 326,724
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 | 23 | 16
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Debt Securities, Available-for-sale | 1,739 | 1,735
Debt Securities, Available-for-sale, Amortized Cost | 1,716 | 1,719
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 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | (10)
Debt Securities, Available-for-sale | 721 | 707
Debt Securities, Available-for-sale, Amortized Cost | 717 | 717
Held to maturity Securities, Amortized Cost | 1,500 | 1,500
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (10) | (10)
Held to Maturity, Fair Value, Total | 1,490 | 1,490
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 | (346) | (349)
Debt Securities, Available-for-sale | 1,314 | 1,329
Debt Securities, Available-for-sale, Amortized Cost | 1,660 | 1,678
Small Business Administration Pooled Securities [Member] |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 160 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (575) | (1,390)
Debt Securities, Available-for-sale | 52,134 | 51,927
Debt Securities, Available-for-sale, Amortized Cost | 52,549 | 53,317
Held to maturity Securities, Amortized Cost | 23,336 | 23,727
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 115 | 105
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (389) | (349)
Held to Maturity, Fair Value, Total | $ 23,062 | $ 23,483

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