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Securities (Reconciliation of fair value of available for sale securities) (Details) - USD ($) $ in Thousands | Sep. 30, 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 | $ 19,871 | $ 6,118
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (552) | (397)
Debt Securities, Available-for-sale | 423,478 | 426,424
Debt Securities, Available-for-sale, Amortized Cost | 404,159 | 420,703
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 30,896 | 13,428
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (2) | (971)
Held to Maturity, Fair Value, Total | 690,467 | 753,263
Amortized Cost | 1,063,732 |
U.S. government agency securities |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,798 | 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 | 24,273 | 33,115
Debt Securities, Available-for-sale, Amortized Cost | 22,475 | 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 | 79 | 21
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Held to Maturity, Fair Value, Total | 4,100 | 4,053
Agency mortgage-backed securities |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 10,471 | 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 | 230,620 | 247,000
Debt Securities, Available-for-sale, Amortized Cost | 220,150 | 243,548
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 19,687 | 8,445
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | (57)
Held to Maturity, Fair Value, Total | 407,793 | 405,802
Agency Collateralized Mortgage Obligations [Member] |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 3,539 | 1,225
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (119) | (19)
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Debt Securities, Available-for-sale | 102,077 | 88,511
Debt Securities, Available-for-sale, Amortized Cost | 98,657 | 87,305
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 9,557 | 4,501
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | (849)
Held to Maturity, Fair Value, Total | 246,937 | 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 | 20 | 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 | 1,145 | 1,396
Debt Securities, Available-for-sale, Amortized Cost | 1,125 | 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 | (20) | 0
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Debt Securities, Available-for-sale | 469 | 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 | (2) | (10)
Held to Maturity, Fair Value, Total | 1,498 | 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 | (412) | (374)
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Debt Securities, Available-for-sale | 1,021 | 1,114
Debt Securities, Available-for-sale, Amortized Cost | 1,433 | 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 | 4,043 | 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 | 63,873 | 54,795
Debt Securities, Available-for-sale, Amortized Cost | 59,830 | 54,024
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 1,573 | 338
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | (55)
Held to Maturity, Fair Value, Total | $ 30,139 | $ 31,607

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