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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The components of accumulated other comprehensive income (loss) included in stockholders’ equity as of December 31, 2016 and 2015 are as follows (in thousands):
| Unrealized Gain (Loss) on Securities |  | Securities with Other-Than-Temporary Impairment Losses |  | Total
December 31, 2016 |  |  |  |  |
Net unrealized losses on securities available-for-sale | $ | (7,649 | ) |  | $ | — |  |  | $ | (7,649 | )
Unamortized losses on securities held-to-maturity transferred from available-for-sale | (393 | ) |  | — |  |  | (393 | )
Securities with other-than-temporary impairment losses | — |  |  | (1,398 | ) |  | (1,398 | )
Tax benefit | 3,134 |  |  | 545 |  |  | 3,679 |
Balance at December 31, 2016 | $ | (4,908 | ) |  | $ | (853 | ) |  | $ | (5,761 | )
December 31, 2015 |  |  |  |  |
Net unrealized gains on securities available-for-sale | $ | 3,243 |  |  | $ | — |  |  | $ | 3,243 |
Unamortized losses on securities held-to-maturity transferred from available-for-sale | (834 | ) |  | — |  |  | (834 | )
Securities with other-than-temporary impairment losses | — |  |  | (1,224 | ) |  | (1,224 | )
Tax benefit (expense) | (939 | ) |  | 477 |  |  | (462 | )
Balance at December 31, 2015 | $ | 1,470 |  |  | $ | (747 | ) |  | $ | 723 |
Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income [Table Text Block] | Amounts reclassified from accumulated other comprehensive income and the affected line items in the statements of income during the years ended December 31, 2016, 2015 and 2014 , were as follows (in thousands):
| Amounts Reclassified from Other Comprehensive Income |  | Affected Line Item in the Statements of Income
| 2016 |  | 2015 |  | 2014 |
Realized gains on available-for-sale securities | $ | 1,192 |  |  | 452 |  |  | 715 |  |  | Securities gains, net (Total reclassified amount before tax)
| (465 | ) |  | (176 | ) |  | (279 | ) |  | Tax expense
Total reclassifications out of accumulated other comprehensive income | $ | 727 |  |  | $ | 276 |  |  | $ | 436 |  |  | Net reclassified amount

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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=66004124&loc=SL7669686-108580 + Details
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