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Compensation Plans | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Compensation Plans | COMPENSATION PLANS The Company has adopted share-based compensation plans to reward and provide long-term incentive for directors and key employees of the Company. These plans provide for the granting of stock, stock options, stock-settled stock appreciation rights ("SSARs"), and restricted stock units (“RSUs”), and may contain performance terms as designated by the Company's Board of Directors upon the recommendation of the Compensation Committee of the Board. The Company uses authorized and unissued shares to satisfy share award exercises. At December 31, 2017, there were 86,082 shares available for grant under the various share-based compensation plans. Total share-based compensation expense that was charged against income was $3.4 million, $3.4 million, and $3.6 million for the years ended December 31, 2017, 2016, and 2015 respectively. The total excess income tax benefit for share-based compensation arrangements was $2.1 million, $1.3 million, and $0.4 million for the years ended December 31, 2017, 2016, and 2015, respectively. Employee Stock Options and Stock-settled Stock Appreciation Rights In determining compensation cost for stock options and SSARs, the Black-Scholes option-pricing model is used to estimate the fair value on date of grant. There were no grants of employee stock options or SSARs during the years ended December 31, 2017, 2016, or 2015. Stock options have been granted to key employees with exercise prices equal to the market price of the Company's common stock at the date of grant and 10-year contractual terms. Stock options have a vesting schedule of three to five years. The SSARs are subject to continued employment, have a 10-year contractual term and vest ratably over five years. Neither stock options nor SSARs carry voting or dividend rights until exercised. At December 31, 2017, there was no remaining unrecognized compensation expense related to stock options and SSARs and all outstanding awards are vested. Various information related to the stock options and SSARs is shown below.
(in thousands) | 2017 |  | 2016 |  | 2015
Compensation expense | $ | — |  |  | $ | — |  |  | $ | 50 |
Intrinsic value of option exercises on date of exercise | 3,156 |  |  | 1,156 |  |  | 74 |
Cash received from the exercise of stock options | 91 |  |  | 87 |  |  | 126 |
Following is a summary of the employee stock option and SSAR activity for 2017.
(in thousands, except share and per share data) | Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value
Outstanding at December 31, 2016 | 270,246 |  |  | $ | 18.85 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (164,116 | ) |  | 22.40 |  |  |  |  |
Forfeited | — |  |  | — |  |  |  |  |
Outstanding at December 31, 2017 | 106,130 |  |  | $ | 13.37 |  |  | 1.9 years |  | $ | 3,373 |
Exercisable at December 31, 2017 | 106,130 |  |  | $ | 13.37 |  |  | 1.9 years |  | $ | 3,373 |
Restricted Stock Units The Company awards nonvested stock, in the form of RSUs to employees and directors. RSUs generally are subject to continued employment and vest ratably over two to five years. Vesting is accelerated upon a change in control or the employee meeting certain retirement criteria. RSUs do not carry voting or dividend rights until vested. Sales of the units are restricted prior to vesting. Various information related to the RSUs is shown below.
($ in thousands) | 2017 |  | 2016 |  | 2015
Compensation expense | $ | 898 |  |  | $ | 850 |  |  | $ | 725 |
Total fair value at vesting date | 1,471 |  |  | 2,275 |  |  | 809 |
Total unrecognized compensation cost for nonvested stock units | 837 |  |  | 1,084 |  |  | 942 |
Expected years to recognize unearned compensation | 1.8 years |  |  | 1.6 years |  |  | 1.7 years |
A summary of the status of the Company's RSU awards as of December 31, 2017 and changes during the year then ended is presented below.
| Shares |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2016 | 58,698 |  |  | $ | 23.06 |
Granted | 16,462 |  |  | 41.68 |
Vested | (33,206 | ) |  | 18.48 |
Forfeited | (732 | ) |  | 14.48 |
Outstanding at December 31, 2017 | 41,222 |  |  | $ | 34.34 |
Stock Plan for Non-Management Directors The Company has adopted a Stock Plan for Non-Management Directors, which provides for issuing up to 200,000 shares of common stock to non-management directors as compensation in lieu of cash. At December 31, 2017, there were 19,163 shares of stock available for issuance under the Stock Plan for Non-Management Directors. Various information related to the Director Plan is shown below.
(in thousands, except share and per share data) | 2017 |  | 2016 |  | 2015
Shares issued | 10,531 |  |  | 12,528 |  |  | 16,283 |
Weighted average fair value | $ | 42.46 |  |  | $ | 31.25 |  |  | $ | 24.43 |
Compensation expense | 397 |  |  | 407 |  |  | 373 |
Employee Stock Issuance Restricted stock was issued to certain key employees as part of their compensation. The restricted stock may be in the form of a one-time award or paid in pro rata installments. The stock is restricted for at least 2 years and upon issuance may be fully vested or vest over 5 years. The Company recognized $0.1 million, zero, and $0.2 million of stock-based compensation expense for the shares issued to the employees in 2017, 2016, and 2015, respectively. The Company issued zero shares in 2017 and 2016, and 14,110 shares in 2015. Long-term incentives The Company has entered into long-term incentive agreements with certain key employees. These awards are conditioned on certain performance criteria and market criteria measured against a group of peer banks over a 3 year period for each grant. The awards contain minimum (threshold), target, and maximum (exceptional) performance levels. In the event of a change in control, as defined in the plan, the awards will vest at a minimum of the target level. The amount of the awards are determined at the end of the 3 year vesting and performance period. In January 2018, the Company awarded 134,600 shares to employees upon completion of the 2015-2017 performance cycle. In February 2017, the Company awarded 118,519 shares to employees upon completion of the 2014-2016 performance cycle. In January 2016, the Company awarded 159,094 shares to employees upon completion of the 2013-2015 performance cycle. Information related to the outstanding grants at December 31, 2017 is shown below:
(in thousands, except share and per share data) | 2016 - 2018 Cycle |  | 2017 - 2019 Cycle
Shares issuable at target | 87,758 |  |  | 55,203 |
Maximum shares issuable | 107,955 |  |  | 68,263 |
Unrecognized compensation cost | $ | 949 |  |  | $ | 1,792 |
Weighted average grant date fair value | 25.26 |  |  | 40.72 |
The Company recorded $2.5 million, $2.5 million and $2.7 million of stock-based compensation expense for these awards during 2017, 2016 and 2015, respectively. In 2017 and 2016, this expense included an additional $0.3 million, and $0.2 million, respectively, related to modifications made for retiring executives. The modification allows for portions of outstanding performance awards to continue to vest as though employment had not terminated and will be paid based on actual performance as determined by the compensation committee following completion of the applicable performance period. 401(k) plans The Company has a 401(k) savings plan which covers substantially all full-time employees over the age of 21. The amount charged to expense for the Company's contributions to the plan was $2.0 million, $1.7 million and $1.6 million for 2017, 2016, and 2015, respectively.

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- Definition The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -URI http://asc.fasb.org/topic&trid=2197446 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -URI http://asc.fasb.org/topic&trid=2127225 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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