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Income Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Current Federal Tax Expense (Benefit) |  |  |  |  |  |  |  |  | $ 44,094 | $ 40,471 | $ 33,400
Current State and Local Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 7,822 | 6,359 | 5,446
Current tax (benefit) expense |  |  |  |  |  |  |  |  | 51,916 | 46,830 | 38,846
Deferred Federal Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (12,078) | 60 | (291)
Deferred State and Local Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (1,690) | 270 | 399
Deferred tax expense (benefit) |  |  |  |  |  |  |  |  | (13,768) | 330 | 108
Income tax provision | $ 16,774 | $ 9,949 | $ 8,195 | $ 3,230 | $ 11,903 | $ 12,378 | $ 12,094 | $ 10,785 | 38,148 | 47,160 | 38,954
Deferred tax assets: |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses | 36,906 |  |  |  | 20,489 |  |  |  | 36,906 | 20,489 |
Deferred Tax Assets, Lease Liability | 15,823 |  |  |  | 14,776 |  |  |  | 15,823 | 14,776 |
Deferred compensation | 11,658 |  |  |  | 11,079 |  |  |  | 11,658 | 11,079 |
Stock option and restricted stock | 2,599 |  |  |  | 2,016 |  |  |  | 2,599 | 2,016 |
OREO | 16 |  |  |  | 0 |  |  |  | 16 | 0 |
Nonaccrual interest | 102 |  |  |  | 112 |  |  |  | 102 | 112 |
Deferred Tax Assets, Net operating losses and credit carryforwards | 3,304 |  |  |  | 4,136 |  |  |  | 3,304 | 4,136 |
Other | (278) |  |  |  | (245) |  |  |  | (278) | (245) |
Total deferred tax assets | 70,686 |  |  |  | 52,853 |  |  |  | 70,686 | 52,853 |
Deferred tax liabilities: |  |  |  |  |  |  |  |  |  |  |
Asset purchase tax basis difference | (6,590) |  |  |  | (7,888) |  |  |  | (6,590) | (7,888) |
Deferred Tax Liabilities, Leasing Arrangements | (14,501) |  |  |  | (13,415) |  |  |  | (14,501) | (13,415) |
FHLB stock dividends | (789) |  |  |  | (789) |  |  |  | (789) | (789) |
Deferred loan fees | (5,695) |  |  |  | (4,097) |  |  |  | (5,695) | (4,097) |
deferred tax liabilities, unrealized gains on available-for-sale securities | 49,837 |  |  |  | 10,091 |  |  |  | 49,837 | 10,091 |
deferred tax liabilites, unrealized gains on equity securities | (3,147) |  |  |  | 0 |  |  |  | (3,147) | 0 |
Deferred tax liabilities, purchase accounting | (7,526) |  |  |  | (8,946) |  |  |  | (7,526) | (8,946) |
Depreciation | (2,427) |  |  |  | (3,152) |  |  |  | (2,427) | (3,152) |
Deferred Tax Liabilities, Derivatives | (7,591) |  |  |  | (3,452) |  |  |  | (7,591) | (3,452) |
Deferred Tax Liabilities, Other | (112) |  |  |  | (100) |  |  |  | (112) | (100) |
Total deferred tax liabilities | 98,215 |  |  |  | 51,930 |  |  |  | 98,215 | 51,930 |
Net deferred tax liability | (27,529) |  |  |  |  |  |  |  | (27,529) |  |
Net deferred tax asset |  |  |  |  | 923 |  |  |  |  | 923 |
Reconciliation of effective income tax rate with federal statutory tax rate |  |  |  |  |  |  |  |  |  |  |
Income tax based on statutory rate |  |  |  |  |  |  |  |  | $ 40,402 | $ 50,738 | $ 44,485
Income tax based on statutory rate, percent |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 21.00%
Tax exempt instruments |  |  |  |  |  |  |  |  | $ (5,987) | $ (6,771) | $ (6,423)
Tax exempt instrument, percent |  |  |  |  |  |  |  |  | (3.00%) | (3.00%) | (3.00%)
Bank owned life insurance proceeds |  |  |  |  |  |  |  |  | $ (1,348) | $ (1,963) | $ (1,261)
Life insurance proceeds, percent |  |  |  |  |  |  |  |  | (1.00%) | (1.00%) | (1.00%)
State income tax, net of federal benefit |  |  |  |  |  |  |  |  | $ 4,844 | $ 5,134 | $ 4,931
State income tax, net of federal benefit, Percent |  |  |  |  |  |  |  |  | 3.00% | 2.00% | 2.00%
Other, net |  |  |  |  |  |  |  |  | $ 237 | $ 22 | $ (2,778)
Other, net, percent |  |  |  |  |  |  |  |  | 0.00% | 1.00% | (1.00%)
Income tax provision | $ 16,774 | $ 9,949 | $ 8,195 | $ 3,230 | $ 11,903 | $ 12,378 | $ 12,094 | $ 10,785 | $ 38,148 | $ 47,160 | $ 38,954
Income tax provision (benefit), percent |  |  |  |  |  |  |  |  | 20.00% | 20.00% | 18.00%

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