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Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Current: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 8,074 | $ 6,616 | $ 12,097
State |  |  |  |  |  |  |  |  | 5,614 | 3,451 | 3,773
Current |  |  |  |  |  |  |  |  | 13,688 | 10,067 | 15,870
Deferred |  |  |  |  |  |  |  |  | 1,503 | (131) | 2,492
Deferred tax adjustment for change in tax rate |  |  |  |  |  |  |  |  | 21 | (479) | 2,591
Amortization of investment in affordable housing tax credits |  |  |  |  |  |  |  |  | 900 | 644 | 316
Income tax expense | $ 4,149 | $ 3,689 | $ 4,415 | $ 3,859 | $ 4,188 | $ 2,041 | $ 2,292 | $ 1,580 | $ 16,112 | $ 10,101 | $ 21,269

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