| 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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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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53,515,418 |
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53,150,142 |
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53,490,393 |
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53,116,420 |
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| Net income available to common stockholders |
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$ |
35,602 |
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$ |
33,509 |
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|
$ |
70,612 |
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|
$ |
66,112 |
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| Basic earnings per common share |
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$ |
0.67 |
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|
$ |
0.63 |
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$ |
1.32 |
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$ |
1.24 |
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| Weighted average common shares outstanding |
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53,515,418 |
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53,150,142 |
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53,490,393 |
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53,116,420 |
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| Dilutive effects of assumed conversions and exercise of stock options and warrants |
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573,689 |
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1,045,881 |
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592,464 |
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1,073,326 |
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| Weighted average common and dilutive potential common shares outstanding |
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54,089,107 |
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54,196,023 |
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54,082,857 |
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54,189,746 |
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| Net income available to common stockholders |
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$ |
35,602 |
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$ |
33,509 |
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$ |
70,612 |
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$ |
66,112 |
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| Diluted earnings per common share |
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$ |
0.66 |
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$ |
0.62 |
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$ |
1.31 |
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$ |
1.22 |
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