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Securities (Reconciliation of fair value of available for sale securities) (Details) - USD ($) $ in Thousands | Jun. 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 | $ 20,674 | $ 6,118
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (498) | (397)
Debt Securities, Available-for-sale | 420,517 | 426,424
Debt Securities, Available-for-sale, Amortized Cost | 400,341 | 420,703
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 33,030 | 13,428
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (2) | (971)
Held to Maturity, Fair Value, Total | 764,054 | 753,263
Amortized Cost | 1,131,367 |
U.S. government agency securities |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,870 | 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 | 24,345 | 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 | 94 | 21
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Held to Maturity, Fair Value, Total | 4,119 | 4,053
Agency mortgage-backed securities |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 11,588 | 3,456
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (2) | (4)
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Debt Securities, Available-for-sale | 248,805 | 247,000
Debt Securities, Available-for-sale, Amortized Cost | 237,219 | 243,548
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 21,135 | 8,445
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | (57)
Held to Maturity, Fair Value, Total | 453,036 | 405,802
Agency Collateralized Mortgage Obligations [Member] |  |
Reconciliation of fair value of securities |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 3,776 | 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 | 80,812 | 88,511
Debt Securities, Available-for-sale, Amortized Cost | 77,036 | 87,305
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 10,360 | 4,501
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | (849)
Held to Maturity, Fair Value, Total | 275,035 | 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 | 21 | 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 | 1,147 | 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 | (44) | 0
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Debt Securities, Available-for-sale | 445 | 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 | (452) | (374)
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Debt Securities, Available-for-sale | 986 | 1,114
Debt Securities, Available-for-sale, Amortized Cost | 1,438 | 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 | 3,419 | 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 | 63,977 | 54,795
Debt Securities, Available-for-sale, Amortized Cost | 60,558 | 54,024
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 1,441 | 338
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | (55)
Held to Maturity, Fair Value, Total | $ 30,366 | $ 31,607

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