Other Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Other Assets [Abstract]
Cash Surrender Value of Life Insurance	$ 197,887	$ 194,897
Finance Lease, Right-of-Use Asset	134,122	0
Interest and fees receivable income	80,955	88,754
Low Income Housing Tax Credit - LIHTC	67,367	59,507
Equity Method Investments, Other Asset Investments	62,269	59,062
Income Taxes Receivable	17,281	39,096
Prepaid Expense	18,351	18,006
Equity Investments Without Readily Determinable Fair Value	14,828	14,758
Equity Warrants	3,532	4,793
Equity Investments With Readily Determinable Fair Value	4,715	4,891
Other Assets, Miscellaneous	19,752	39,132
Other Assets	$ 621,059	$ 522,896