Federal Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred Tax Assets, Gross [Abstract]
Allowance for loan losses	$ 27,675	$ 29,572
Acquisition-related fair value adjustments	8,699	9,498
Accrued expenses not currently deductible	6,288	4,518
Other	11,663	11,756
Total deferred tax assets	54,325	55,344
Deferred Tax Liabilities, Gross [Abstract]
Defined benefit pension plan	8,020	0
Goodwill	4,680	4,177
Other	6,140	9,339
Total deferred tax liabilities	18,840	13,516
Net deferred tax assets	$ 35,485	$ 41,828