| Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
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Three Months Ended September 30, |
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Nine Months Ended September 30, |
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2019 |
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2018 |
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2019 |
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2018 |
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(In Thousands, Except Shares and Per Share Data) |
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| Earnings per common share |
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| Weighted average common shares outstanding |
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53,544,747 |
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|
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53,171,144 |
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|
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53,508,710 |
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|
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53,134,861 |
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| Net income available to common stockholders |
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$ |
37,563 |
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|
$ |
34,560 |
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|
$ |
108,175 |
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|
$ |
100,672 |
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| Basic earnings per common share |
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$ |
0.70 |
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|
$ |
0.65 |
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|
$ |
2.02 |
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$ |
1.89 |
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|
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| Weighted average common shares outstanding |
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53,544,747 |
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|
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53,171,144 |
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|
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53,508,710 |
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|
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53,134,861 |
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| Dilutive effects of assumed conversions and exercise of stock options and warrants |
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551,621 |
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1,020,078 |
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578,700 |
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1,055,383 |
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| Weighted average common and dilutive potential common shares outstanding |
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54,096,368 |
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54,191,222 |
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54,087,410 |
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54,190,244 |
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| Net income available to common stockholders |
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$ |
37,563 |
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|
$ |
34,560 |
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|
$ |
108,175 |
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|
$ |
100,672 |
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| Diluted earnings per common share |
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$ |
0.69 |
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$ |
0.64 |
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$ |
2.00 |
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$ |
1.86 |
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