| **CONSOLIDATED CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands** | Total       | Preferred | Common Stock | Additional Paid in Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) |
|----------------------------------------------------------------------------------------------------|-------------|-----------|--------------|----------------------------|-------------------|-----------------------------------------------|
| Beginning balance (in shares) at Dec. 31, 2018                                                     |        | 125       | 49,349,800   |                       |              |                                          |
| Beginning balance at Dec. 31, 2018                                                                 | $ 1,408,260 | $ 125     | $ 6,169      | $ 840,052                  | $ 583,336         | $ (21,422)                                    |
| **Comprehensive income:**                                                                          |        |      |         |                       |              |                                          |
| Net income                                                                                         | 38,817      |      |         |                       | 38,817            |                                          |
| Other comprehensive income (loss), net of tax                                                      | 19,827      |      |         |                       |              | 19,827                                        |
| Cash dividends on common stock                                                                     | (10,933)    |      |         |                       | (10,933)          |                                          |
| Share-based compensation (in shares)                                                               |        |      | 103,660      |                       |              |                                          |
| Share-based compensation                                                                           | 981         |      | $ 13         | 968                        |              |                                          |
| Stock issued under employee benefit plans (in shares)                                              |        |      | 5,339        |                       |              |                                          |
| Stock issued under employee benefit plans                                                          | 174         |      | $ 1          | 173                        |              |                                          |
| Stock issued under dividend reinvestment and stock purchase plan (in shares)                       |        |      | 8,508        |                       |              |                                          |
| Stock issued under dividend reinvestment and stock purchase plan                                   | 340         |      | $ 1          | 339                        |              |                                          |
| Stock options exercised (in shares)                                                                |        |      | 3,700        |                       |              |                                          |
| Stock options exercised                                                                            | 40          |      |         | 40                         |              |                                          |
| Stock redeemed (in shares)                                                                         |        |      | (42,539)     |                       |              |                                          |
| Restricted shares withheld for taxes                                                               | (1,658)     |      | $ (5)        | (1,653)                    |              |                                          |
| Ending balance (in shares) at Mar. 31, 2019                                                        |        | 125       | 49,428,468   |                       |              |                                          |
| Ending balance at Mar. 31, 2019                                                                    | 1,455,848   | $ 125     | $ 6,179      | 839,919                    | 611,220           | (1,595)                                       |
| Beginning balance (in shares) at Dec. 31, 2019                                                     |        | 125       | 55,368,482   |                       |              |                                          |
| Beginning balance at Dec. 31, 2019                                                                 | 1,786,437   | $ 125     | $ 6,921      | 1,054,997                  | 696,520           | 27,874                                        |
| **Comprehensive income:**                                                                          |        |      |         |                       |              |                                          |
| Net income                                                                                         | 34,263      |      |         |                       | 34,263            |                                          |
| Other comprehensive income (loss), net of tax                                                      | 25,782      |      |         |                       |              | 25,782                                        |
| Cash dividends on common stock                                                                     | (14,265)    |      |         |                       | (14,265)          |                                          |
| Repurchase of common stock (in shares)                                                             |        |      | (1,634,437)  |                       |              |                                          |
| Repurchases of common stock                                                                        | (55,912)    |      | $ (204)      | (55,708)                   |              |                                          |
| Share-based compensation (in shares)                                                               |        |      | 3,332        |                       |              |                                          |
| Share-based compensation                                                                           | 1,220       |      |         | 1,220                      |              |                                          |
| Stock issued under dividend reinvestment and stock purchase plan (in shares)                       |        |      | 15,710       |                       |              |                                          |
| Stock issued under dividend reinvestment and stock purchase plan                                   | $ 428       |      | $ 2          | 426                        |              |                                          |
| Stock options exercised (in shares)                                                                | 1,050       |      | 1,050        |                       |              |                                          |
| Stock options exercised                                                                            | $ 7         |      |         | 7                          |              |                                          |
| Ending balance (in shares) at Mar. 31, 2020                                                        |        | 125       | 53,754,137   |                       |              |                                          |
| Ending balance at Mar. 31, 2020                                                                    | $ 1,777,960 | $ 125     | $ 6,719      | $ 1,000,942                | $ 716,518         | $ 53,656                                      |

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.
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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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Amount after tax and reclassification adjustments of other comprehensive income (loss).
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Number of shares issued which are neither cancelled nor held in the treasury.
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Number of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan.
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Number of shares issued during the period as a result of an employee stock purchase plan.
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Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).
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Number of share options (or share units) exercised during the current period.
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Value of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan.
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Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.
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Value, after forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).
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Value of stock issued as a result of the exercise of stock options.
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Number of stock bought back by the entity at the exercise price or redemption price.
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Equity impact of the value of stock bought back by the entity at the exercise price or redemption price.
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Number of shares that have been repurchased and retired during the period.
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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).
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| - Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.
+ References
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+ Details**Name:**us-gaap_StockholdersEquity**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |