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Acquisition - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Business Combinations [Abstract] |  |
Total revenue (net interest income plus other income) | $ 474,891 | $ 476,878
Net income available to common shareholders | $ 161,228 | $ 177,906
Earnings per share: |  |
Basic (in dollars per share) | $ 2.89 | $ 3.19
Diluted (in dollars per share) | $ 2.88 | $ 3.18

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