| 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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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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54,315,671 |
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54,205,565 |
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|
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54,291,739 |
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54,143,324 |
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| Net income available to common stockholders |
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$ |
64,031 |
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|
$ |
52,499 |
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|
$ |
183,749 |
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|
$ |
153,950 |
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| Basic earnings per common share |
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$ |
1.18 |
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|
$ |
0.97 |
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$ |
3.38 |
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$ |
2.84 |
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| Weighted average common shares outstanding |
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54,315,671 |
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|
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54,205,565 |
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|
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54,291,739 |
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|
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54,143,324 |
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| Dilutive effects of assumed exercise of stock options and vesting of performance shares |
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231,011 |
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272,175 |
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242,054 |
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296,680 |
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| Weighted average common and dilutive potential common shares outstanding |
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54,546,682 |
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54,477,740 |
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54,533,793 |
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54,440,004 |
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| Net income available to common stockholders |
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$ |
64,031 |
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$ |
52,499 |
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$ |
183,749 |
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$ |
153,950 |
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| Diluted earnings per common share |
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$ |
1.17 |
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$ |
0.96 |
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$ |
3.37 |
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$ |
2.83 |
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