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Securities (Reconciliation of fair value of available for sale securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | $ 18,332 | $ 6,118
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (488) | (397)
Debt Securities, Available-for-sale | 437,296 | 426,424
Debt Securities, Available-for-sale, Amortized Cost | 419,452 | 420,703
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 31,700 | 13,428
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (143) | (971)
Held to Maturity, Fair Value, Total | 809,355 | 753,263
Amortized Cost | 1,197,250 |
U.S. government agency securities |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,818 | 642
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Debt Securities, Available-for-sale | 24,292 | 33,115
Debt Securities, Available-for-sale, Amortized Cost | 22,474 | 32,473
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |  | 123
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Held to Maturity, Fair Value, Total | 0 | 12,997
U.S. Treasury securities |  |
Reconciliation of fair value of securities |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 110 | 21
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Held to Maturity, Fair Value, Total | 4,139 | 4,053
Agency mortgage-backed securities |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 11,110 | 3,456
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (1) | (4)
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Debt Securities, Available-for-sale | 258,784 | 247,000
Debt Securities, Available-for-sale, Amortized Cost | 247,675 | 243,548
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 18,864 | 8,445
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (133) | (57)
Held to Maturity, Fair Value, Total | 482,363 | 405,802
Agency Collateralized Mortgage Obligations [Member] |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4,027 | 1,225
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | (19)
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Debt Securities, Available-for-sale | 87,210 | 88,511
Debt Securities, Available-for-sale, Amortized Cost | 83,183 | 87,305
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 11,981 | 4,501
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | (849)
Held to Maturity, Fair Value, Total | 289,902 | 297,314
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 | 18 | 19
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Debt Securities, Available-for-sale | 1,144 | 1,396
Debt Securities, Available-for-sale, Amortized Cost | 1,126 | 1,377
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 |  | 5
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (53) | 0
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Debt Securities, Available-for-sale | 436 | 493
Debt Securities, Available-for-sale, Amortized Cost | 489 | 488
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 | (434) | (374)
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Debt Securities, Available-for-sale | 1,009 | 1,114
Debt Securities, Available-for-sale, Amortized Cost | 1,443 | 1,488
Small Business Administration Pooled Securities [Member] |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,359 | 771
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Debt Securities, Available-for-sale | 64,421 | 54,795
Debt Securities, Available-for-sale, Amortized Cost | 63,062 | 54,024
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 745 | 338
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | (55)
Held to Maturity, Fair Value, Total | $ 31,461 | $ 31,607

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