Organization and Basis of Presentation - Accounting Standards Adopted (Details) - USD ($) $ in Thousands	Jan. 01, 2020	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Assets
Allowance for Credit Losses - Loans and Leases	$ 131,300	$ 166,013	$ 130,530	$ 141,546	$ 141,718
Liabilities
Reserve for Unfunded Commitments	16,900
Prior to Adoption | ASC Topic 326
Assets
Allowance for Credit Losses - Loans and Leases	130,530
Liabilities
Reserve for Unfunded Commitments	600
After Adoption | ASC Topic 326
Assets
Allowance for Credit Losses - Loans and Leases	770
Liabilities
Reserve for Unfunded Commitments	16,300
Pretax Cumulative Effect Adjustment of a Change in Accounting Principle	17,070
Less: Income Taxes	(4,553)
Cumulative-Effect Adjustment of a Change in Accounting Principle, Net of Tax	$ 12,517