Income Taxes, Deferred Tax Assets and Liabilities Resulted in Deferred Taxes Table (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Gross deferred tax assets:
Allowance for loan losses	$ 106,258	$ 99,219
Allowance for other losses	10,906	11,609
Accrued liabilities	6,802	5,773
Deferred compensation	31,677	31,392
State net operating losses	14,154	22,640
Nonaccrual interest	1,901	2,383
Other	5,811	7,929
Total deferred tax assets	177,509	180,945
Gross deferred tax liabilities
FHLB stock dividends	2,165	6,367
Prepaid expenses	69,396	68,955
Goodwill	25,770	24,049
Mortgage banking activities	15,704	13,147
Deferred loan fee income	17,770	21,199
State deferred taxes	6,366	9,011
Lease financing	3,042	2,313
Bank premises and equipment	7,491	9,532
Other	9,062	5,501
Total deferred tax liabilities	156,766	160,074
Net deferred tax assets	20,743	20,871
Tax effect of unrealized (gain) loss related to available for sale securities	219	(10,902)
Tax effect of unrealized loss related to pension and postretirement benefits	20,404	14,468
Net tax effected items	20,623	3,566
Net deferred tax assets including items with tax effect recorded directly to OCI	$ 41,366	$ 24,437