| Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
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Three Months Ended June 30, |
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Six Months Ended June 30, |
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2022 |
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2021 |
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2022 |
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2021 |
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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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54,295,789 |
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|
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54,173,034 |
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|
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54,279,574 |
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|
|
54,112,190 |
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| Net income available to common stockholders |
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$ |
62,105 |
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|
$ |
49,996 |
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|
$ |
119,718 |
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|
$ |
101,451 |
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| Basic earnings per common share |
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$ |
1.14 |
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|
$ |
0.92 |
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|
$ |
2.21 |
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|
$ |
1.87 |
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|
|
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| Weighted average common shares outstanding |
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54,295,789 |
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|
|
54,173,034 |
|
|
|
54,279,574 |
|
|
|
54,112,190 |
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| Dilutive effects of assumed exercise of stock options and vesting of performance shares |
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236,596 |
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287,196 |
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247,668 |
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309,137 |
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| Weighted average common and dilutive potential common shares outstanding |
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54,532,385 |
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54,460,230 |
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54,527,242 |
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|
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54,421,327 |
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| Net income available to common stockholders |
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$ |
62,105 |
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|
$ |
49,996 |
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|
$ |
119,718 |
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|
$ |
101,451 |
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| Diluted earnings per common share |
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$ |
1.14 |
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|
$ |
0.92 |
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$ |
2.20 |
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$ |
1.86 |
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