Income Taxes Schedule of Deferred Income Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of Deferred Income Tax Assets and Liabilities [Abstract]
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses	$ 37,341	$ 42,481
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits	42,934	44,572
Deferred Tax Assets, Real Estate Mortgage Investment Conduit	6,201	6,749
Deferred tax assets, acquired liabilities	5,041	5,576
Deferred Tax Assets, Goodwill	2,838	13,041
Deferred Tax Assets, Core Deposit Intangible	1,275	1,066
Deferred Tax Assets, Other	0	1,875
Deferred Tax Assets, Gross	95,630	115,360
Deferred Tax Liabilities, Leasing Arrangements	(6,962)	(4,776)
Deferred tax liabilities, acquired loans	(18,765)	(35,533)
Deferred Tax Liabilities, Other Comprehensive Income	(29,841)	(28,929)
Deferred Tax Liabilities, Federal Home Loan Bank Stock	(25,577)	(25,577)
Deferred Tax Liabilities, Deferred Expense, Deferred Financing Costs	(5,709)	(4,618)
Deferred Tax Liabilities, Other	(1,665)	0
Deferred Tax Liabilities, Net	(88,519)	(99,433)
Total net deferred tax asset	$ 7,111	$ 15,927