Stock and Incentive Compensation Plans (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Options [Roll Forward]
Outstanding, beginning of year (in shares)	105,450	699,600	1,205,100
Exercised (in shares)	0	(187,300)	(11,125)
Expired (in shares)	(105,450)	(406,850)	(494,375)
Outstanding, end of year (in shares)	0	105,450	699,600
Exercisable, end of year (in shares)	0	105,450	699,600
Average Option Price [Abstract]
Outstanding, beginning of year (in dollars per share)	$ 27.43	$ 27.58	$ 27.31
Exercised (in dollars per share)	$ 0	$ 26.96	$ 24.09
Expired (in dollars per share)	$ 27.43	$ 27.90	$ 27.01
Outstanding, end of year (in dollars per share)	$ 0	$ 27.43	$ 27.58
Exercisable, end of year (in dollars per share)	$ 0	$ 27.43	$ 27.58
Compensation expense for all stock incentive plans [Abstract]
Recognized compensation expense	$ 4,152	$ 3,599	$ 3,973
Unrecognized compensation expense	4,816
Performance Based Award [Member]
Shares [Roll Forward]
Nonvested shares, beginning of year (in shares)	160,520	159,583	179,421
Granted (in shares)	73,726	62,119	55,295
Released from restriction (in shares)	(38,580)	(54,784)	(72,632)
Forfeited (in shares)	(14,471)	(6,398)	(2,501)
Nonvested shares, end of year (in shares)	181,195	160,520	159,583
Weighted-Average Grant Date Fair Value [Abstract]
Nonvested shares, beginning of year (in dollars per share)	$ 25.20	$ 24.26	$ 20.30
Granted (in dollars per share)	$ 25.58	$ 23.65	$ 25.66
Released from restriction (in dollars per share)	$ 25.40	$ 24.15	$ 21.38
Forfeited (in dollars per share)	$ 24.86	$ 25.42	$ 24.70
Nonvested shares, end of year (in dollars per share)	$ 24.98	$ 25.20	$ 24.26
Compensation expense for all stock incentive plans [Abstract]
Recognized compensation expense	1,065	825	868
Unrecognized compensation expense	1,197
Weighted average life of unrecognized compensation expense	1 year 8 months 23 days
Performance Awards Includes Achievement Shares for Grants after 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Achievement Shares from Performance Grants Prior to 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Time-vested Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Shares [Roll Forward]
Nonvested shares, beginning of year (in shares)	291,634	317,573	334,356
Granted (in shares)	105,690	112,964	141,616
Released from restriction (in shares)	(124,869)	(122,727)	(151,331)
Forfeited (in shares)	(8,550)	(16,176)	(7,068)
Nonvested shares, end of year (in shares)	263,905	291,634	317,573
Weighted-Average Grant Date Fair Value [Abstract]
Nonvested shares, beginning of year (in dollars per share)	$ 24.48	$ 23.28	$ 21.04
Granted (in dollars per share)	$ 24.91	$ 24.47	$ 24.66
Released from restriction (in dollars per share)	$ 24.74	$ 24.40	$ 23.14
Forfeited (in dollars per share)	$ 24.77	$ 25.14	$ 24.14
Nonvested shares, end of year (in dollars per share)	$ 24.66	$ 24.48	$ 23.28
Compensation expense for all stock incentive plans [Abstract]
Recognized compensation expense	3,087	2,774	3,105
Unrecognized compensation expense	3,619
Weighted average life of unrecognized compensation expense	1 year 9 months 4 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ROATE Performance measure (in hundredths)	100.00%
TSR Performance measure (in hundredths)	100.00%
Stock Option-based Awards [Member]
Average Option Price [Abstract]
Total intrinsic value of options exercised	$ 0	$ 191	$ 16
1997 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Stock and incentive compensation plan, contractual term	10 years
2005 Stock and Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for issuance (in shares)	5,466,172
Vesting period	5 years
Stock and incentive compensation plan, contractual term	7 years

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Level of performance goal measured by return on average tangible equity (ROATE) for a share based compensation plan.

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Level of performance goal measured by total shareholder return (TSR) for a share based compensation plan.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Number of share options (or share units) exercised during the current period.

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