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Income Taxes (Deferred Tax Assets and Deferred Tax Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets: |  |
Allowance for loan losses | $ 166,398 | $ 192,534
Investments in qualified affordable housing partnerships, tax credit and other investments, net | 14,977 | 11,174
Deferred compensation | 23,954 | 23,604
Interest income on nonaccrual loans | 4,192 | 5,909
State taxes | 5,237 | 273
Unrealized losses on securities | 37,423 | 0
Tax credit carryforwards | 8,692 | 0
Premises and equipment | 1,434 | 2,096
Lease liabilities | 31,324 | 30,554
Other | 1,018 | 1,441
Total deferred tax assets | 294,649 | 267,585
Deferred tax liabilities: |  |
Equipment lease financing | 26,607 | 29,990
Investments in qualified affordable housing partnerships, tax credit and other investments, net | 12,187 | 14,912
Core deposit intangibles | 1,119 | 1,934
FHLB stock dividends | 1,886 | 1,855
Mortgage servicing assets | 1,759 | 1,675
Acquired debts | 1,536 | 1,597
Prepaid expenses | 1,525 | 1,194
Premises and equipment | 0 | 99
Unrealized gains on securities | 0 | 21,593
Operating lease right-of-use assets | 29,472 | 28,468
Other | 428 | 453
Total deferred tax liabilities | 76,519 | 103,770
Net deferred tax assets | $ 218,130 | $ 163,815

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