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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |  | 2017 |
​ | ​ | (In thousands, except per share data) |
Net income, as reported | ​ | $ | 41,279 | ​ | $ | 55,090 | ​ | $ | 41,121 | ​
Divided by: | ​ |  |  | ​ |  |  | ​ |  |  | ​
Weighted average common shares outstanding | ​ |  | 28,709 | ​ |  | 28,709 | ​ |  | 29,080 | ​
Weighted average common stock equivalents | ​ |  | — | ​ |  | 1 | ​ |  | 2 | ​
Total weighted average common shares outstanding and common stock equivalents | ​ |  | 28,709 | ​ |  | 28,710 | ​ |  | 29,082 | ​
Basic earnings per common share | ​ | $ | 1.44 | ​ | $ | 1.92 | ​ | $ | 1.41 | ​
Diluted earnings per common share | ​ | $ | 1.44 | ​ | $ | 1.92 | ​ | $ | 1.41 | ​
Dividend Payout ratio | ​ |  | 58.3 | % |  | 41.7 | % |  | 51.1 | %

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