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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Amounts Reclassified from AOCI [Abstract] |  |  |  |  |  |
Securities gains | $ 204 |  | $ 2 |  | $ 560 | $ (286)
Tax expense | (1,638) |  | 2,921 |  | 2,303 | 5,381
Net income | 18,324 | $ 14,939 | 11,599 | $ 15,814 | 33,263 | 27,413
Unrealized Gains on AFS Securities [Member] | Reclassification Out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |
Amounts Reclassified from AOCI [Abstract] |  |  |  |  |  |
Securities gains | 5 |  | 2 |  | 6 | 151
Tax expense | 1 |  | 0 |  | 2 | 32
Net income | $ 4 |  | $ 2 |  | $ 4 | $ 119

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