Retirement Plans (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Composite market value factor, minimum range	0.988035	1.029720
Composite market value factor, maximum range	1.073235	1.119776
Fair Value Level Transfers Among Levels 1, 2, and 3	$ 0	$ 0
Owner Occupied And Commercial Real Estate Loans Unamortized Premiums	47,200,000	59,300,000
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	0
Benefit liability other supplement retirement plans	6,000,000	6,300,000
Shares of company common stock	270,305	321,964
Dividends received under the plan	41,000	15,000
Rate of employee contribution from earnings	80.00%
Matching contribution allocation rate first time	0.00%
Employee contribution rate for first time matching	0.00%
Matching contribution allocation rate second time	50.00%
Employees contribution rate for second time matching	0.00%
Employer contribution in common stock	22,700,000	21,600,000	21,000,000
Minimum range of eligible compensation for noncontributory profit sharing feature	0.00%
Maximum range of eligible compensation for noncontributory profit sharing feature	0.00%
Accrued profit sharing expense	11,804,000	11,783,000	11,700,000
Contribution rate of profit sharing expenses	0
Composite market value factor, at end of period	1.05329	1.08063
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Settlements, Benefit Obligation	96,000	0
Defined Benefit Plan, Expected Future Benefit Payments in Year One	10,338,000
Liability for pension/postretirement benefits	2,813,000	(34,126,000)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	(39,082,000)	(80,743,000)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	(39,082,000)	(80,743,000)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	0	0
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	9,822,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	9,547,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	10,133,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	10,543,000
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	53,674,000
Supplemental Employee Retirement Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Settlements, Benefit Obligation	0	0
Defined Benefit Plan, Expected Future Benefit Payments in Year One	2,056,000
Liability for pension/postretirement benefits	(10,276,000)	(11,234,000)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	(1,968,000)	(2,587,000)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	(1,918,000)	(2,412,000)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	(50,000)	(175,000)
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	833,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	1,073,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	799,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	794,000
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	3,642,000
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Settlements, Benefit Obligation	0	0
Defined Benefit Plan, Expected Future Benefit Payments in Year One	96,000
Liability for pension/postretirement benefits	(1,062,000)	(1,129,000)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	354,000	526,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	354,000	376,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	0	150,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	100,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	105,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	109,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	106,000
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	451,000
Defined Benefit Plans and Other Postretirement Benefit Plans [Domain]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Level Transfers Among Levels 1, 2, and 3	$ 0	$ 0
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target investment allocation percentage in equity	65.00%
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target investment allocation percentage in equity	30.00%
Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Target investment allocation percentage in equity	5.00%