| 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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2023 |
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2022 |
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2023 |
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2022 |
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(In Thousands, Except Shares and Per Share Data) |
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| Earnings per common share |
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|
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| Weighted average common shares outstanding |
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54,411,016 |
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|
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54,295,789 |
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|
|
54,385,775 |
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|
|
54,279,574 |
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| Net income available to common stockholders |
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$ |
53,437 |
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|
$ |
62,105 |
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|
$ |
111,408 |
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|
$ |
119,718 |
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| Basic earnings per common share |
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$ |
0.98 |
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|
$ |
1.14 |
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|
$ |
2.05 |
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|
$ |
2.21 |
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|
|
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| Weighted average common shares outstanding |
|
|
54,411,016 |
|
|
|
54,295,789 |
|
|
|
54,385,775 |
|
|
|
54,279,574 |
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| Dilutive effects of assumed exercise of stock options and vesting of performance shares |
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|
94,710 |
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236,596 |
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134,250 |
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247,668 |
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| Weighted average common and dilutive potential common shares outstanding |
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54,505,726 |
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54,532,385 |
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54,520,025 |
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|
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54,527,242 |
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| Net income available to common stockholders |
|
$ |
53,437 |
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|
$ |
62,105 |
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|
$ |
111,408 |
|
|
$ |
119,718 |
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| Diluted earnings per common share |
|
$ |
0.98 |
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|
$ |
1.14 |
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|
$ |
2.04 |
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|
$ |
2.20 |
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