Income Taxes - Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Allowance for credit losses and nonperforming assets valuation allowance	$ 191,187	$ 166,398
Investments in qualified affordable housing partnerships, tax credit and other investments, net	21,011	14,977
Stock compensation and other accrued compensation	25,857	23,954
Interest income on nonaccrual loans	5,185	4,192
State taxes	13,259	5,237
Net Unrealized Losses on Debt Securities and Derivatives	309,837	37,423
Tax credit carryforwards	0	8,692
Premises and equipment	3,827	1,434
Lease liabilities	34,859	31,324
Other	6,169	1,018
Total deferred tax assets	611,191	294,649
Deferred tax liabilities:
Equipment lease financing	27,237	26,607
Investments in qualified affordable housing partnerships, tax credit and other investments, net	7,709	12,187
FHLB stock dividends	1,926	1,886
Mortgage servicing assets	1,963	1,759
Acquired debts	1,477	1,536
Prepaid expenses	2,478	1,525
Operating lease right-of-use assets	32,606	29,472
Other	6,270	1,547
Total deferred tax liabilities	81,666	76,519
Net deferred tax assets	$ 529,525	$ 218,130