Other Assets Other Assets (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Cash Surrender Value of Life Insurance		$ 199,029	$ 194,897
Finance Lease, Right-of-Use Asset		129,301	0
Interest and fees receivable income		81,479	88,754
Low Income Housing Tax Credit - LIHTC		75,149	59,507
Equity Method Investments, Other Asset Investments	[1]	65,152	59,062
Income Taxes Receivable		31,591	39,096
Prepaid Expense		17,099	18,006
Equity Investments Without Readily Determinable Fair Value		14,890	14,758
Equity Investments With Readily Determinable Fair Value		2,998	4,891
Warrants and Rights Outstanding		3,434	4,793
Deferred Tax Assets, Net		0	17,489
Other Assets, Miscellaneous		16,689	39,132
Other Assets		636,811	540,385
Community Reinvestment Act Investments [Member]
Equity Investments Without Readily Determinable Fair Value		$ 17,800	$ 12,500

[1] Includes equity investments without readily determinable fair values of $17.8 million and $12.5 million at December 31, 2019 and 2018.