Income Taxes - Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Allowance for credit losses and nonperforming assets valuation allowance	$ 217,731	$ 191,187
Investments in qualified affordable housing partnerships, tax credit and other investments, net	28,216	21,011
Stock compensation and other accrued compensation	33,169	25,857
Interest income on nonaccrual loans	7,034	5,185
State taxes	9,885	13,259
Net unrealized losses on debt securities and derivatives	242,303	309,837
Premises and equipment	1,782	3,827
Lease liabilities	32,636	34,859
FDIC special assessment charge	22,212	0
Other	9,019	6,169
Total deferred tax assets	603,987	611,191
Deferred tax liabilities:
Equipment lease financing	15,564	27,237
Investments in qualified affordable housing partnerships, tax credit and other investments, net	23,103	7,709
FHLB stock dividends	1,947	1,926
Mortgage servicing assets	2,102	1,963
Acquired debts	1,398	1,477
Prepaid expenses	2,981	2,478
Operating lease right-of-use assets	30,272	32,606
Other	7,871	6,270
Total deferred tax liabilities	85,238	81,666
Net deferred tax assets	$ 518,749	$ 529,525