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Securities (Reconciliation of fair value of securities) (Details) - USD ($) $ in Thousands | Sep. 30, 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 | $ 8,757 | $ 1,233
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (392) | (9,029)
Debt Securities, Available-for-sale | 391,975 | 442,752
Debt Securities, Available-for-sale, Amortized Cost | 383,610 | 450,548
Held to maturity Securities, Amortized Cost | 777,270 | 611,490
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 15,629 | 2,533
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (736) | (10,383)
Held to Maturity, Fair Value, Total | 792,163 | 603,640
Amortized Cost | 1,160,880 | 1,062,038
Gross Unrealized Gains | 24,386 | 3,766
Unrealized Losses Other | (1,128) | (19,412)
Debt Securities, Available-for-sale and Held-to-maturity | 1,184,138 | 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 | 827 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | (439)
Debt Securities, Available-for-sale | 33,302 | 32,038
Debt Securities, Available-for-sale, Amortized Cost | 32,475 | 32,477
Held to maturity Securities, Amortized Cost | 12,853 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 146 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Held to Maturity, Fair Value, Total | 12,999 |
U.S. Treasury securities |  |
Reconciliation of fair value of securities |  |
Held to maturity Securities, Amortized Cost | 1,003 | 1,004
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 19 | 11
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Held to Maturity, Fair Value, Total | 1,022 | 1,015
Agency mortgage-backed securities |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4,330 | 1,020
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (5) | (3,406)
Debt Securities, Available-for-sale | 200,603 | 220,105
Debt Securities, Available-for-sale, Amortized Cost | 196,278 | 222,491
Held to maturity Securities, Amortized Cost | 418,350 | 252,484
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 8,900 | 1,548
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (39) | (3,104)
Held to Maturity, Fair Value, Total | 427,211 | 250,928
Agency Collateralized Mortgage Obligations [Member] |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,964 | 197
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | (3,435)
Debt Securities, Available-for-sale | 94,538 | 134,911
Debt Securities, Available-for-sale, Amortized Cost | 92,574 | 138,149
Held to maturity Securities, Amortized Cost | 310,352 | 332,775
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 5,857 | 869
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (687) | (6,920)
Held to Maturity, Fair Value, Total | 315,522 | 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 | 1,736 | 1,735
Debt Securities, Available-for-sale, Amortized Cost | 1,713 | 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 | 3 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | (10)
Debt Securities, Available-for-sale | 720 | 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 | (387) | (349)
Debt Securities, Available-for-sale | 1,106 | 1,329
Debt Securities, Available-for-sale, Amortized Cost | 1,493 | 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 | 1,610 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | (1,390)
Debt Securities, Available-for-sale | 59,970 | 51,927
Debt Securities, Available-for-sale, Amortized Cost | 58,360 | 53,317
Held to maturity Securities, Amortized Cost | 33,212 | 23,727
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 707 | 105
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | (349)
Held to Maturity, Fair Value, Total | $ 33,919 | $ 23,483

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