Other Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Other Assets [Abstract]
Cash Surrender Value of Life Insurance	$ 196,161	$ 194,897
Finance Lease, Right-of-Use Asset	125,402	0
Interest and fees receivable income	89,727	88,754
Low Income Housing Tax Credit - LIHTC	59,948	59,507
Equity Method Investments, Other Asset Investments	59,824	59,062
Income Taxes Receivable	17,289	39,096
Prepaid Expense	16,319	18,006
Equity Investments Without Readily Determinable Fair Value	14,777	14,758
Equity Warrants	4,438	4,793
Equity Investments With Readily Determinable Fair Value	3,848	4,891
Other Assets, Miscellaneous	22,998	39,132
Other Assets	$ 610,731	$ 522,896