Employee Benefit Plans (Details Narrative)	12 Months Ended
Dec. 31, 2016 USD ($) pension_plan shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($)
Number of non-contributory defined-contribution retirement plans \| pension_plan	2
Common stock, shares issued \| shares	15,171,816	15,015,594
Common stock, value	$ 1,517,000	$ 1,502,000
Expenses related to plans	20,496,000	16,025,000	$ 21,102,000
Employee stock ownership plan - expense recognized	$ 4,900,000	4,400,000	3,900,000
Incentive stock options (ISOPs), maximum contribution, percent	4.00%
Matching contributions to 401(k) plan cost	$ 2,400,000	2,300,000	2,200,000
Corporate owned life insurance	$ 77,905,000	$ 75,792,000
DB Pension Plan
Common stock, shares issued \| shares	42,192	42,192
Common stock, value	$ 4,000,000	$ 2,400,000
Accumulated benefit obligation	77,304,000	76,219,000	$ 79,138,000
Unfunded status recognized in other liabilities	$ 5,497,000	$ 7,288,000
Rate of compensation increase (percent)		5.00%	5.00%
Expected long-term return on plan assets (percent)	7.25%	7.25%	7.25%
DB Pension Plan \| Maximum
Rate of compensation increase (percent)	6.30%
Potential change in benefit obligation	$ 173,000
Increase (decrease) in health care cost trend rate (percent)	1.00%
Potential increase (decrease) in service and interest costs	$ 16,500,000
DB Pension Plan \| Minimum
Rate of compensation increase (percent)	4.50%
Potential change in benefit obligation	$ (150,000)
Increase (decrease) in health care cost trend rate (percent)	(1.00%)
Potential increase (decrease) in service and interest costs	$ (13,900)
DC Retirement Plan
Common stock, value	$ 3,800,000	$ 2,400,000	$ 1,400,000
Requisite service period	1 year
Life and Healthcare Plan
Maximum annual contribution, percent of account balances, percent	4.00%
Accumulated benefit obligation	$ 9,121,000	8,732,000	$ 8,927,000
Unfunded status recognized in other liabilities	$ 9,121,000	$ 8,732,000
Rate of compensation increase (percent)	5.00%	5.00%	5.00%
SERPs
Accumulated benefit obligation	$ 23,399,000	$ 22,160,000	$ 22,862,000
Unfunded status recognized in other liabilities	$ 23,399,000	$ 22,160,000
Rate of compensation increase (percent)	5.00%	5.00%	5.00%
Split Dollar Life Insurance Plan
Benefit liability	$ 1,400,000	$ 1,300,000
Compensation expense	$ 110,000	$ 47,000

The trending rate of health care costs.

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Deferred Compensation Arrangement with Individual, Requisite Service Period To Participate In Pension Plan

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The amount of matching contributions for the 401(k) plan the company has made during the period.

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Defined Benefit Plan, Maximum Annual Contribution, Percent of Account Balances, Percent

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Defined Contribution Plan, Number Of Non-contributory Defined-contribution Retirement Plans

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Employee Stock Ownership Plan (ESOP), Incentive Stock Options (ISOPs), Maximum Employer Matching Contribution, Percent of Match

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The potential impact to service and interest cost (in relation to defined benefit plans) as correlated to the change in health care costs.

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The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy.

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-Publisher FASB
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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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- Definition

This represents the noncurrent liability recognized in the balance sheet that is associated with the defined benefit pension plans.

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- Definition

Expected rate of compensation increases (for pay-related plans).

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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Net increase or decrease in the plan benefit obligation during the reporting period.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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Costs and payments related to employee benefits and equity-based compensation, such as pension expense and contributions, other postretirement benefits expense and payments, stock or unit options expense, and amortization of restricted stock or unit.

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The amount of plan compensation cost recognized during the period.

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The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period).

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