| 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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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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| Weighted average common shares outstanding |
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54,424,561 |
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54,315,671 |
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54,398,845 |
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|
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54,291,739 |
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| Net income available to common stockholders |
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$ |
53,340 |
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|
$ |
64,031 |
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|
$ |
164,748 |
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|
$ |
183,749 |
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| Basic earnings per common share |
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$ |
0.98 |
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|
$ |
1.18 |
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|
$ |
3.03 |
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$ |
3.38 |
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| Weighted average common shares outstanding |
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54,424,561 |
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|
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54,315,671 |
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|
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54,398,845 |
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|
|
54,291,739 |
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| Dilutive effects of assumed exercise of stock options and vesting of performance shares |
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106,074 |
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231,011 |
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131,952 |
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242,054 |
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| Weighted average common and dilutive potential common shares outstanding |
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54,530,635 |
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54,546,682 |
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54,530,797 |
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54,533,793 |
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| Net income available to common stockholders |
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$ |
53,340 |
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$ |
64,031 |
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|
$ |
164,748 |
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$ |
183,749 |
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| Diluted earnings per common share |
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$ |
0.98 |
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$ |
1.17 |
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$ |
3.02 |
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$ |
3.37 |
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