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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2017
Stockholders' Equity Note [Abstract] |
Schedule of the change in the components of the accumulated other comprehensive income (loss) |
|  | Six months ended June 30, 2017 |
|  |  |  |  | Unrecognized Net |  |  | Accumulated |
|  | Unrealized |  |  | Pension and |  |  | Other |
|  | Gain (Loss) |  |  | Postretirement |  |  | Comprehensive |
(in thousands) |  | on Securities (1) |  |  | Costs (2) |  |  | Loss |
Balance at beginning of period |  | $ | (1,936 | ) |  | $ | (1,865 | ) |  | $ | (3,801 | )
Other comprehensive income, before reclassifications |  |  | 1,452 |  |  |  | 45 |  |  |  | 1,497 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Current period other comprehensive income, before tax |  |  | 1,452 |  |  |  | 45 |  |  |  | 1,497 |
Income tax expense |  |  | (552 | ) |  |  | (18 | ) |  |  | (570 | )
Current period other comprehensive income, net of tax |  |  | 900 |  |  |  | 27 |  |  |  | 927 |
Balance at end of period |  | $ | (1,036 | ) |  | $ | (1,838 | ) |  | $ | (2,874 | )
|  | Six months ended June 30, 2016 |
|  |  |  |  | Unrecognized Net |  |  | Accumulated |
|  | Unrealized |  |  | Pension and |  |  | Other |
|  | Gain (Loss) |  |  | Postretirement |  |  | Comprehensive |
(in thousands) |  | on Securities (1) |  |  | Costs (2) |  |  | Loss |
Balance at beginning of period |  | $ | (591 | ) |  | $ | (1,427 | ) |  | $ | (2,018 | )
Other comprehensive income, before reclassifications |  |  | 3,357 |  |  |  | 39 |  |  |  | 3,396 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | (490 | ) |  |  | 0 |  |  |  | (490 | )
Current period other comprehensive income, before tax |  |  | 2,867 |  |  |  | 39 |  |  |  | 2,906 |
Income tax expense |  |  | (1,090 | ) |  |  | (14 | ) |  |  | (1,104 | )
Current period other comprehensive income, net of tax |  |  | 1,777 |  |  |  | 25 |  |  |  | 1,802 |
Balance at end of period |  | $ | 1,186 |  |  | $ | (1,402 | ) |  | $ | (216 | )
(1) The pre-tax amounts reclassified from accumulated other comprehensive loss are included in gain on sale of investment securities in the consolidated statements of income. (2) The pre-tax amounts reclassified from accumulated other comprehensive loss are included in the computation of net periodic pension cost.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
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Period Type: | duration