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Accumulated Other Comprehensive Income (Loss) (Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net gain (loss) on investment securities |  | $ 1,677 | $ (127) | $ 1,260
Interest income |  | 129,912 | 122,864 | 112,615
Income before income taxes |  | 59,421 | 49,532 | 43,471
Income tax (expense) benefit |  | (10,559) | (10,006) | (9,945)
Net income |  | 48,862 | 39,526 | 33,526
Total reclassified for the period |  | (177) | (910) | (7)
Securities Available for Sale and Transferred Securities [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassification before tax | [1] | 1,176 | (539) | 1,103
Reclassification tax | [1] | (307) | 136 | (426)
Total reclassified for the period | [1] | 869 | (403) | 677
Prior Service Credit [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassification before tax | [2] | 65 | 72 |
Net Actuarial Losses [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassification before tax | [2] | (1,463) | (750) |
Pension And Post-Retirement Obligations [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassification before tax |  | (1,398) | (678) |
Reclassification tax |  | 352 | 171 |
Total reclassified for the period |  | (1,046) | (507) | $ (684)
Reclassification out of Accumulated Other Comprehensive Income | Securities Available for Sale and Transferred Securities [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net gain (loss) on investment securities |  | 1,677 | (127) |
Interest income |  | (501) | (412) |
Income before income taxes |  | 1,176 | (539) |
Income tax (expense) benefit |  | (307) | 136 |
Net income |  | $ 869 | $ (403) |
[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.
[2] | These items are included in the computation of net periodic pension expense. See Note 19 – Employee Benefit Plans for additional information.

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