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Accumulated Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Other comprehensive income (loss), Pre-tax Amount |  | $ 16,713 | $ 7,368
Other comprehensive income (loss), Tax Effect |  | 4,282 | 1,858
Other comprehensive income (loss), before Reclassifications, Net-of-tax Amount |  | 12,327 | 5,119
Amounts reclassified from accumulated other comprehensive income (loss) |  | 104 | 391
Total other comprehensive income, net of tax |  | 12,431 | 5,510
Securities Available for Sale and Transferred Securities [Member] |  |  |
Other comprehensive income (loss), before Reclassifications, Pre-tax Amount |  | 16,451 | 7,184
Reclassification, Pre-tax Amount | [1] | (175) | 174
Other comprehensive income (loss), Pre-tax Amount |  | 16,276 | 7,358
Other comprehensive income (loss), before Reclassifications, Tax Effect |  | 4,215 | 1,811
Reclassification, Tax Effect | [1] | (45) | 44
Other comprehensive income (loss), Tax Effect |  | 4,170 | 1,855
Other comprehensive income (loss), before Reclassifications, Net-of-tax Amount |  | 12,236 | 5,373
Amounts reclassified from accumulated other comprehensive income (loss) | [1] | (130) | 130
Total other comprehensive income, net of tax |  | 12,106 | 5,503
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member] |  |  |
Other comprehensive income (loss), Pre-tax Amount |  | 123 | (340)
Other comprehensive income (loss), Tax Effect |  | 32 | (86)
Total other comprehensive income, net of tax |  | 91 | (254)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Including Portion Attributable to Noncontrolling Interest [Member] |  |  |
Other comprehensive income (loss), Pre-tax Amount |  | (9) | (16)
Other comprehensive income (loss), Tax Effect |  | (2) | (4)
Total other comprehensive income, net of tax |  | (7) | (12)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] |  |  |
Other comprehensive income (loss), Pre-tax Amount |  | 323 | 366
Other comprehensive income (loss), Tax Effect |  | 82 | 93
Total other comprehensive income, net of tax |  | 241 | 273
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member] |  |  |
Other comprehensive income (loss), Pre-tax Amount |  | 314 | 350
Other comprehensive income (loss), Tax Effect |  | 80 | 89
Total other comprehensive income, net of tax |  | $ 234 | $ 261
[1] | Includes amounts related to the amortization/accretion of unrealized net gains and losses related to the Company’s reclassification of available for sale investment securities to the held to maturity category. The unrealized net gains/losses will be amortized/accreted over the remaining life of the investment securities as an adjustment of yield.

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