Income Taxes Deferred Tax Assets and Liabilities Resulted in Deferred Taxes Table (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Gross deferred tax assets:
Allowance for loan losses	$ 104,944	$ 115,128
Allowance for other losses	13,790	18,205
Accrued liabilities	6,101	6,055
Deferred compensation	28,911	27,073
Securities valuation adjustment	1,724	2,258
Benefit of tax loss and credit carryforwards	32,552	46,376
Nonaccrual interest	4,431	1,112
Other	9,433	8,518
Total gross deferred tax assets	201,886	224,725
Gross deferred tax liabilities
FHLB stock dividends	6,425	7,602
Prepaid expenses	61,225	55,944
Intangible amortization	28,914	28,478
Mortgage banking activity	14,497	6,257
Deferred loan fee income	25,480	26,800
State income taxes	12,754	16,083
Leases	2,525	2,269
Depreciation	17,931	22,386
Other	1,374	2,225
Total gross deferred tax liabilities	171,125	168,044
Net deferred tax assets	30,761	56,681
Tax effect of unrealized gain related to available for sale securities	7,685	(53,579)
Tax effect of unrealized loss related to pension and postretirement benefits	8,024	23,586
Net tax effected items	15,709	(29,993)
Net defferred tax assets including tax effect recorded directly to OCI	$ 46,470	$ 26,688