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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2019 and 2018 are as follows (in thousands):
| Unrealized Gain (Loss) on Securities |  | Total
December 31, 2019 |  |  |
Net unrealized gains on securities available-for-sale | $ | 11,825 |  |  | $ | 11,825 |
Unamortized losses on securities held-to-maturity transferred from available-for-sale | (50 | ) |  | (50 | )
Tax Expense | (3,415 | ) |  | (3,415 | )
Balance at December 31, 2019 | $ | 8,360 |  |  | $ | 8,360 |
December 31, 2018 |  |  |
Net unrealized losses on securities available-for-sale | $ | (8,951 | ) |  | $ | (8,951 | )
Unamortized losses on securities held-to-maturity transferred from available-for-sale | (166 | ) |  | (166 | )
Tax benefit | 2,644 |  |  | 2,644 |
Balance at December 31, 2018 | $ | (6,473 | ) |  | $ | (6,473 | )
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, 2019, 2018 and 2017, were as follows (in thousands):
| Amounts Reclassified from Other Comprehensive Income |  | Affected Line Item in the Statements of Income
| 2019 |  | 2018 |  | 2017 |
Realized gains on available-for-sale securities | $ | 802 |  |  | 901 |  |  | 616 |  |  | Securities gains, net (Total reclassified amount before tax)
| (233 | ) |  | (261 | ) |  | (216 | ) |  | Tax expense
Total reclassifications out of accumulated other comprehensive income | $ | 569 |  |  | $ | 640 |  |  | $ | 400 |  |  | Net reclassified amount

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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